7 vs. 9/11 jugs

Posted: Fri Jan 23, 2015 6:56 pm

Sitting and work and need to make some spacers to position my 7 jugs on a set of mock-up cases to the height of the 9/11 jugs. Does anybody know the difference in height between the two?

Posted: Fri Jan 23, 2015 7:17 pm

One fin,or two chain links.

Honda tried to make a bunch of engines and make all the parts not fit.

Is that clear enough?

Posted: Fri Jan 23, 2015 7:27 pm

OK you F-ing smart ass, what is the pitch length of the chain, you relly didn't tell me shit, is that clear enough?

Posted: Fri Jan 23, 2015 7:31 pm

The stroke on the 9/11 is 69mm, and the 750 is 62mm, so I am guessing it would be 7mm difference?

CB1100F Joined: Jun 18, 2006 Posts: 2527 Location: UK

Hi

Just measured a chain, the pitch is approx 6.5mm

Keith

Posted: Fri Jan 23, 2015 8:29 pm

Thank you rat and kr

Posted: Fri Jan 23, 2015 10:39 pm

The cam chain pitch spec is exactly 0.25", but I'm not sure the difference in the cylinder blocks. Other distances could have been fudged.

Posted: Sat Jan 24, 2015 12:46 am

djhurayt wrote:

Sitting and work and need to make some spacers to position my 7 jugs on a set of mock-up cases to the height of the 9/11 jugs. Does anybody know the difference in height between the two?

David, you have a pm.

Posted: Sat Jan 24, 2015 4:16 am

You need to make a different length cam chain guide as well. The chain is the same SO it really doesn't matter. Also the head bolts.

The con rods are a different length to make up some of the difference as well.

Like I said it is to make it HARD to change something.

The easy way is to bore the 750 block. I made both 1010(72mm) and 955(70mm). The best thing is to forget the short stroke and make 1187cc or larger.

Posted: Sat Jan 24, 2015 1:33 pm

I'm NOT building some new radical combination 750 based motor ! ! !

all I am trying to do is shim things up temporarily so that the exhaust ports will be the same height as my 11 motors, I need to hang a pipe so some bracing can be added, like I said I was at work and did not have the motors or empty 750 mock-up cases sitting next to me, and wanted to grab some gauge block or chunk of scrap to use, geeeeez

Never mind, I got it Smile

Posted: Sat Jan 24, 2015 1:40 pm

Man, for some reason I sure do want a paul shark hoodie all of a sudden............ Laughing

PM sent Dave.

Posted: Sat Jan 24, 2015 1:56 pm

Yer gonna get beat up by guys in hoodies!

MB-5 Joined: Nov 29, 2008 Posts: 12 Location: Upstate NY

I have 750 and 1000c cylinders handy, and get:

750 - 3.347"

1000c - 3.605"

Posted: Sat Jan 24, 2015 10:51 pm

cb750wtf wrote:

I have 750 and 1000c cylinders handy, and get:

750 - 3.347"

1000c - 3.605"

That sounds right, I think the cams must sit at a tiny different height in the bigger heads than the 750s, making it a little more than one chain link of difference.