A Little Eplanation or My Ramble

Posted: Sun May 15, 2011 1:03 pm

For a cheap and simple attempt to fix the stumble at revs, try putting some seafoam or Techron through the fuel. That is assuming the bike has new NGK or Nippondenso plugs in already.

Guest

Save the $10, and don't buy Seafoam snake oil. Instead check for air leaks at the carb/intake, and airbox boots.

Posted: Sun May 15, 2011 8:43 pm

The carb insulators are new Honda pieces and the boots to the airbox appear to be sealed very well and are very pliable. The carbs themselves look awesome inside. I cleaned them extra good. Very Happy

Posted: Mon May 30, 2011 5:15 pm

While I was helping my buddy on his '88 Ninja 600 (at my house) I decided to install the CBR600 coils I "won" off ebay.
The installation is very straightforward. I cut a small piece from each bracket that came with the coils to use as extensions so I could use the stock 750 brackets. That way I didn't have to modify the 750 at all.
Got 'em on and warmed the bike up a bit then throttled it up a few times just sitting there. WooHoo! She revved right up high on the tach! Before, just sitting trying to rev, it would only go up to about 6000 or so and break up bad.
So, I figured I'd take it for a little spin. Suddenly while idling, the lights got dimmer and dimmer, it started missing, then died. Checked the battery connections and pertinent wiring and discovered the 30 amp main fuse was lose. Snugged it up and restarted the bike. Cool.
Let it idle, went in the house to grab my riding jacket, came back out and it had died again. Checked all the connections again; all were fine. Hooked up the battery charger for a few minutes, restarted it and checked charging output. Nothing. Down to 11. something volts at all rpms and going down.
So, looks like I gotta chase down a charging problem now. Oh well, so it goes with old bikes.
Still stoked about the coils though!

Posted: Mon May 30, 2011 7:07 pm

While your in there, put in a modern blade style 30 amp fuse and holder, AutoZone has them for six bucks.

http://www.autozone.com/autozone/accessories/Cooper-Bussmann-30-Amps-maximum-heavy-duty-in-line-ATC-fuse-holder-with-cover/_/N-25gq?itemIdentifier=32415&_requestid=5922463

Posted: Mon May 30, 2011 10:12 pm

cbxsix wrote:

While your in there, put in a modern blade style 30 amp fuse and holder, AutoZone has them for six bucks.

http://www.autozone.com/autozone/accessories/Cooper-Bussmann-30-Amps-maximum-heavy-duty-in-line-ATC-fuse-holder-with-cover/_/N-25gq?itemIdentifier=32415&_requestid=5922463

+1, I have them on all 3 of mine. Somebody said that this was a "solution in search of a problem" in another thread, I think, but I did it, it's easy and now I can get a fuse whenever I need one. I also carry a spare in my Owners Manual bag.

Keep plugging away at her, Bruce! You'll get it, and then have a bike for life!

Posted: Tue May 31, 2011 12:04 am

Thanks cbx and cliff. I'm familiar with those fuse and holder kits as I frequently use them when installing electronic devices in marine applications at work. I shall retrofit one to the bike. Cool

Posted: Tue May 31, 2011 1:57 am

Hey Brucifer, it sounds like she needs a new charging rotor. Do a search & you will see many on that problem. I have 4 dead rotor's laying around here. It's common on these bikes. It's easy to check. Just pull the cover off & ohm out the 2 copper rings. I think they need to be in the 4.6 & above area. But check me on that, as my memory with numbers SUCKS.

Good luck with it. I have never seen a Supertrap like yours & that was a cool story. I feel very lucky as my dad is still with us & I still get him to race MX at 74 yr's old. He doesn't do it much but willing to, when I offer a bike.

Keep it in a wheelie, Jim

Posted: Tue May 31, 2011 3:35 am

That's awesome your dad's still riding AND RACING at 74 JJam!

Ya know, the rotor is what came to mind first when this happened.
Several years ago, my boss had a CB900C that quit charging. While searching the internet for common charging system failures, I happened on this site and found out about the charging rotor problem. That's exactly what it happened to be on the 900. Installed a used good one I got from a buddy and problem solved.
I'll check it first when I get back on it.

Posted: Sun Jun 05, 2011 2:09 pm

Yep, bad rotor. Also two of the stator mount screws had backed out a bit allowing it to just touch the rotor.
The rotor tested good on the parts bike so I installed it and fired it up. Sweet! 13.7 volts at about 1500 rpm or so.
Took it up the road and she ran right up to redline completely miss-free! Nice.
Now on to valve adjustment and carb sync. Then, cosmetics.

Posted: Sun Jun 26, 2011 4:28 pm

Still plugging away at it.
The starter clutch had been slipping occasionally and had gotten progressively worse. So, I removed the cover and had a little looksy and low and behold, the three retainer bolts were all loose.
I removed the clutch assembly and removed the plungers and springs for inspection. All looked good, so I reinstalled the pieces and tightened the bolts up good. Reinstalled the cover and fired it up. SWEET! It worked perfect AND the noise that I had previously thought was an extremely noisey primary chain was in reality the starter clutch rattling around! No more noise!
I'm really, really happy. This thing sounds awesome now.

Posted: Sun Jun 26, 2011 6:17 pm

You are getting lucky my friend..... Wink

Good Job!!!!

Jebby

Posted: Thu Jan 15, 2026 4:54 am

Hey guys! It's been a while.
I lost all my contact and login information a couple times and was unable to reregister. Well, cliffiec came to the rescue and got me back in AND under my original account!
Thanks again, Rick! Very Happy

So, one item I ended up doing was the installation of a Yamaha R6 starter mechanism. Works great.

Now, up to the present.
The bike has been mainly sitting as the carburetor fuel tube orings are shot and leaking. I have been procrastinating removing and repairing them as they are so much fun to do, as you all well know. lol.
But I have been thinking about something else. The bike is comfortable and handles well enough, but having owned a couple first gen. FZ1s, a couple Bandit 1200s, a Bandit 1250, a 919 Hornet and a couple ZRX1200Rs over the years, the 750 just doesn't really do much for me in the power department. Now, I don't have any desire to buy another bike, so I would like to at least make this one produce some entertaining power.
I happen to have a 1982 CB900F parts bike. I know nothing about the engine or its history as I saved it from the scrapyard, but I was thinking of pulling it apart and do any repairs it might need and install one of those cheap Ebay 1123cc big bore kits. Then, install that engine in the 750.

Also, I've always thought that the color scheme on this bike was lack luster, too much silver in both the bodywork and engine. If I do the 900, the engine will be black, but I'm not sure what colors to go with on the bodywork. I would like to keep it some factory color, whether it be USA or another country color scheme.

Would like to upgrade the brakes as well. The front lever assembly has always felt clunky and the brake feel and action kind of wooden. Upgrading to the 900 forks and front brake assemblies may help?

Any input from you guys on this possible project are quite welcome. Smile

Oh and PS, it's great to be back!

Posted: Thu Jan 15, 2026 4:04 pm

Welcome back, man, happy to be able to help!

I'm partial to the 1100 suspension/wheels/brakes combo. Stainless lines will make a big difference in feel, too.

Not sure you can go to 1123 in a 900 block, but I have 3 985's, and (even with Crusin Image pistons) they still put a grin on my face!

Keep us posted on your progress, and questions!

Posted: Thu Jan 15, 2026 9:26 pm

cliffiec wrote:

Welcome back, man, happy to be able to help!

I'm partial to the 1100 suspension/wheels/brakes combo. Stainless lines will make a big difference in feel, too.

Not sure you can go to 1123 in a 900 block, but I have 3 985's, and (even with Crusin Image pistons) they still put a grin on my face!

Keep us posted on your progress, and questions!

Thanks for the input, cliffiec. Smile

I do believe you are correct regarding the 1123cc kit. The 985 would probably do just fine.
Crusin Image is the kit I was looking at.

Posted: Thu Jan 15, 2026 10:24 pm

brucifer wrote:

Hey guys! It's been a while.

....."" the 750 just doesn't really do much for me in the power department. Now, I don't have any desire to buy another bike, so I would like to at least make this one produce some entertaining power.""

""I happen to have a 1982 CB900F parts bike.""

Any input from you guys on this possible project are quite welcome. Smile

Oh and PS, it's great to be back!

Welcome Back Bruce!!

750cc power is very Boring, INDEED!!! Thankfully, you have a 900F motor. That's a good starting point. Next is, how much money are you willing to spend on that motor?

First off, try to get that 900F motor running while still in the parts bike. You will have a better idea of what you need to do, once you hear it running. Or, just go the, "Ebay CRUZINIMAGE 67.50mm Big Bore Kit"..
You will require six aluminum engine inserts, to replace the 900F rubber engine mounts, so that the motor can be "Solid Mounted" in the 750F frame. Jjam ( Jim Sawtell) sells these.

Your 1982 750F has decent Brakes & Suspension. Just needs modification! Start with a better, front Brake Master Cylinder. NISSIN Master, off of any 90s & up GSXR, is an economical upgrade. Then upgrade the brake lines with Stainless. Your stock Twin-Piston Calipers are good. Just upgrade the pads with "HH" or "Sintered" compound.
The forks are 37mm. Replace the stock fork springs for Progressive Suspension brand or Race Tech brand. Then modify the lower "Seat Pipe" rebound oil holes. These are the two small holes at the top of the pipe. Weld shut one of these holes. Fill with 15W fork oil, amount is with fork tube fully collapsed down, no fork spring, fill up until you have 125mm of air space to the top. Also, purchase a Fork Brace.

Back to the Motor. If you decide the 985cc Big Bore, you must first find a competent Machine shop. Thankfully we have "Jjam" in Sandy, Oregon.
Next you will need a complete Engine Oil Seal Kit, and you MUST replace the stock 900F CONNECTING ROD BOLTS, upgrade to CB1100F Rod Bolts!!!!
Upgrade the Front cam chain guide & cam chain tensioner.

I could keep going on & on, but this is a start. Like I said before. How Much Money are you willing to spend?? This obsession can add up very fast!!

Here is mine, lots of $$$$

Regards,

Mel

Posted: Fri Jan 16, 2026 2:42 am

melchiro wrote:

brucifer wrote:

Hey guys! It's been a while.

....."" the 750 just doesn't really do much for me in the power department. Now, I don't have any desire to buy another bike, so I would like to at least make this one produce some entertaining power.""

""I happen to have a 1982 CB900F parts bike.""

Any input from you guys on this possible project are quite welcome. Smile

Oh and PS, it's great to be back!

Welcome Back Bruce!!

750cc power is very Boring, INDEED!!! Thankfully, you have a 900F motor. That's a good starting point. Next is, how much money are you willing to spend on that motor?

First off, try to get that 900F motor running while still in the parts bike. You will have a better idea of what you need to do, once you hear it running. Or, just go the, "Ebay CRUZINIMAGE 67.50mm Big Bore Kit"..
You will require six aluminum engine inserts, to replace the 900F rubber engine mounts, so that the motor can be "Solid Mounted" in the 750F frame. Jjam ( Jim Sawtell) sells these.

Your 1982 750F has decent Brakes & Suspension. Just needs modification! Start with a better, front Brake Master Cylinder. NISSIN Master, off of any 90s & up GSXR, is an economical upgrade. Then upgrade the brake lines with Stainless. Your stock Twin-Piston Calipers are good. Just upgrade the pads with "HH" or "Sintered" compound.
The forks are 37mm. Replace the stock fork springs for Progressive Suspension brand or Race Tech brand. Then modify the lower "Seat Pipe" rebound oil holes. These are the two small holes at the top of the pipe. Weld shut one of these holes. Fill with 15W fork oil, amount is with fork tube fully collapsed down, no fork spring, fill up until you have 125mm of air space to the top. Also, purchase a Fork Brace.

Back to the Motor. If you decide the 985cc Big Bore, you must first find a competent Machine shop. Thankfully we have "Jjam" in Sandy, Oregon.
Next you will need a complete Engine Oil Seal Kit, and you MUST replace the stock 900F CONNECTING ROD BOLTS, upgrade to CB1100F Rod Bolts!!!!
Upgrade the Front cam chain guide & cam chain tensioner.

I could keep going on & on, but this is a start. Like I said before. How Much Money are you willing to spend?? This obsession can add up very fast!!

Here is mine, lots of $$$$

Regards,

Mel

Thank you, Mel!
I must correct you on one point, my bike is a 1980, not an '82. Would I be fair in stating the 1980 brakes, with their single-piston calipers, are worse than the '82 750? Also, is the 1980 fork tube diameter less than the '82 750?

The parts bike 900F unfortunately, has been sitting with the cam cover removed for years and as such, the cams have some rust. I have a nice set of 900 cams I purchased from a member several years ago. The drain plug is missing, so at least any rainwater that it has ingested ran out immediately rather than accumulating and filling the engine.

I was planning to swap the entire front end from the 900 as well as the rear brake system to the 750.

If history has any bearing on this project, I'll probably get partially done doing this project then find a decent, running 900 or 1100 for a deal I can't pass up, buy it, then let the 750 langush partially finished for years. lol.

Beautiful bike you have there. Smile

Twinstar Joined: Jul 24, 2012 Posts: 97 Location: uk

Just an interested bystander here but…. Keep the 750 as it is (due to the sentimental value) and get a second bike with all the bling.
I have a fantastic 900 with 1123 engine, better cams, better suspension and brakes, all sorts of stuff. It’s a massive increase in everything over the 750. Probably no more expensive than upgrading what you have?
All the best

Posted: Fri Jan 16, 2026 4:16 pm

jonathan wrote:

Just an interested bystander here but…. Keep the 750 as it is (due to the sentimental value) and get a second bike with all the bling.
I have a fantastic 900 with 1123 engine, better cams, better suspension and brakes, all sorts of stuff. It’s a massive increase in everything over the 750. Probably no more expensive than upgrading what you have?
All the best

Good point's Jonathan. I was more or less thinking of doing this with what I already have and therefore not putting money out buying another bike. I could slowly build the 750 as money permitted.
I may keep my eye out for a cheap, clapped out 900, or even an 1100, with a title. If the parts bike 900 I have now had a title, I would be inclined to build it rather than the 750.

Posted: Mon Feb 23, 2026 1:31 am

Thought a little more about this and will probably leave the 750 as-is, as Jonathan suggested.
There may be a 1982 Suzuki GS1100E finding a home in my garage in the near future. Smile

Posted: Mon Feb 23, 2026 4:03 am

brucifer wrote:

jonathan wrote:

Just an interested bystander here but…. Keep the 750 as it is (due to the sentimental value) and get a second bike with all the bling.
I have a fantastic 900 with 1123 engine, better cams, better suspension and brakes, all sorts of stuff. It’s a massive increase in everything over the 750. Probably no more expensive than upgrading what you have?
All the best

Good point's Jonathan. I was more or less thinking of doing this with what I already have and therefore not putting money out buying another bike. I could slowly build the 750 as money permitted.
I may keep my eye out for a cheap, clapped out 900, or even an 1100, with a title. If the parts bike 900 I have now had a title, I would be inclined to build it rather than the 750.

One of my bikes came to me without a title (in New Mexico), and I used a process called a "Surety Bond" to get a new one, free and clear, and not a salvage title. A little research on the procedure in Cali might yield some positive results, and get the 900 back in the game...

https://www.dmv.ca.gov/portal/handbook/vehicle-industry-registration-procedures-manual-2/bonds-and-certifications/motor-vehicle-ownership-surety-bond/

Posted: Tue Feb 24, 2026 1:51 am

brucifer wrote:

Thought a little more about this and will probably leave the 750 as-is, as Jonathan suggested.
There may be a 1982 Suzuki GS1100E finding a home in my garage in the near future. Smile

If you do get it www.thegsresources.com is an excellent website for all things GS.

Posted: Tue Feb 24, 2026 2:50 am

cliffiec--The 900 is really kind of too far gone and I have so many other projects going on, I'm not sure how long it would take to get it back on the road, even if the title was sorted.

smurdoch--Thanks, I just joined.