Hey Guys! I'm Back.

Posted: Mon Jul 26, 2010 2:18 am

No, I wasn't dead, Just married... Up to four kids now! Since I have like NO time or money, I figured it was a good time to start another project. In order to escape the total bedlam that is my home, I make haste for the garage for side jobs & the like. This gives me good cover for the CB project just started. Couple years ago I picked up a 750F with 3,900 orig miles. Ran like shit. was told carbs were junk ( no surprise ) n got bike really cheap. Then found low compression on cyl. #2, bent rod & hair line crack in sleeve where edge of rod bolt kissed it. I moth balled bike to re-visit @ later time. Fast forward 2 kids later, I had a 900c with 7,000 miles on it GIVEN to me. was told had bad starter n been in barn since like '94. Bike looked like HELL so I didn't hold much hope for anything. Today I pulled engine & boke it down. WOW!! you could eat off insides of this eng. cylinder walls have perfect crosshatch still visible. no scuff markes on pistons & bearings look like engine was never started. Trust me , no exagerations. I got so excited I just had to share. Now to fit the 750 cases with 900 rotating assy, jugs & head. Yipee!

Great to be BACK! Very Happy

MB-5 Joined: Jul 28, 2010 Posts: 5 Location: alabama

Oh that's great to know that you are back in the forum.Welcoem back and enjoy you stay.I am a new member here and finding the forum very good and friendly.

Posted: Wed Jul 28, 2010 7:51 am

I don't think I was here before you left but welcome back and good luck with the project.

I also wan't here when Rob was here but after reading as much as I have on this site I know about him. The first thing I thought when I read the title of this thread was "must be Rob" lol

Posted: Wed Jul 28, 2010 12:19 pm

usaf222 wrote:

I also wan't here when Rob was here but after reading as much as I have on this site I know about him. The first thing I thought when I read the title of this thread was "must be Rob" lol

I think you're thinking of Rod?? And I thought it might have been him again as well, but welcome back AstroLT Wink

ian

Posted: Wed Jul 28, 2010 2:01 pm

Hello Astro, Since the 900 motor is in such nice shape internally why not just reassemble that motor and use it in the 750 chassis? When such severe damage occurs (the 750) metal gets everywhere and even possible distorted cases could cause the "new hybrid" to fail. You can always use the better looking covers from the sides of the 750. Paint the block to match (either silver or black rattle can duplicolor ceramic engine paint) and call it done.

Posted: Wed Jul 28, 2010 6:02 pm

Donor motor is a 900c. Shaft drive. more hassle than worth trying a conversion... when 750 eng went up, damage was almost hard to find. no metal anywhere. the rod warped just a couple degrees forward. angle pulled piston slight down so no valve issues. the change in anle of rod allowed just the tip of rod bolt to contact sleeve. causing hairline crack. I stared at the parts for 2 hours b4 figuring out what happened.

Posted: Thu Jul 29, 2010 11:22 am

Huh, weird failures always scare me. I did (as in blueprinted) a Subaru motor for a customer that had failed when almost new. The Subaru dealer took the whole thing apart then blamed the customer for using an STP oil filter and gave it back to him in boxes. Now I tell customers to always use factory oil filters when under warranty/ save receipts for filter and oil! Anyway I redid the whole motor from the ground up only to have it fail again. When I tore it down the same rod bearing failed again for no reason I can tell. I installed a good used short block to resolve problem.

Stuff like "damage was almost hard to find. no metal anywhere. the rod warped just a couple degrees forward. angle pulled piston slight down so no valve issues. the change in anle of rod allowed just the tip of rod bolt to contact sleeve. causing hairline crack. I stared at the parts for 2 hours b4 figuring out what happened.

Does the top of the piston, valve or head show any impact marks like something fell down a plug hole? The prior owner could have had a carb flood over and fill the cylinder with gas since 750's don't have the vacuum fuel shut off feature. Melchrio was telling me how he converted a shaft drive block to chain drive last weekend but other than the concept I have no idea (pm him if you are considering this option.)

Anyway enough of the why's....it's nice to have you back, my 1100 sat quite a bit when my son was younger but now that he is out of the house I get a lot more riding time. Post as you go along so we can see the progress (pictures would nice.) Doc

Posted: Thu Jul 29, 2010 1:40 pm

I got over the exact cause of the failure years ago. The damage found was the effect. Nither here nor there. I was waiting for this current opportunity to rebuild bike. Very Happy

Now I have it & good reasons to be hanging out here.
The rebuild is folloing this thread:

http://cb1100f.net/modules.php?name=Forums&file=viewtopic&p=457961#457961

Pic's coming soon.

Thanks Guy's . It's good to be back...

Posted: Thu Jul 29, 2010 3:22 pm

Welcome back George! Glad you are posting again. I'll have to stop over and see the work in progress. Lots of interest here. talk soon.

Posted: Fri Jul 30, 2010 12:28 am

bikeboy wrote:

I think you're thinking of Rod??

ian

I think you are probably right.

Sorry I'm not trying to change the subject.

Again, Welcome back!

Posted: Fri Jul 30, 2010 9:42 am

Hey Buddy, good to hear from you too. Didn't know you were still cruisin' this F'in site! Stop by when ever. Gimme a call. Should be in the garage most this week-end. side jobs keepin' me alive. Getting real good @ window tinting also. Talk soon!

Posted: Sat Jul 31, 2010 10:41 am

Pulled 750 out of shed. when I tear down I'll try to get pic's of the original damage.

Posted: Sun Aug 01, 2010 10:52 am

Welcome back.

Posted: Mon Aug 02, 2010 9:37 am

Thanks Gene. Sure good to see some familiar avaitar's. Very Happy