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Post subject: Engine turning on frame
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Willevil  Suburban Commuter Joined: 12 Jun 2004 Total posts: 92 Location: Korso-Finland |
I got my bike one piece and look my chains and sprokets, and there is funny think i see. I try to get chain line as good as i can with 170 rear tyre, and it seems to be ok , but when i look front sproket it is not in same line with bike. Hole engine looks turned a little. Rear of engine has moved to right and front looks moved to left. All mounting places looks good, and everythink is right way on their places. So i think mounting rubbers are tired after many years driving. I compared rear of engine with swing front end, and there is about 5mm hole on left side and about 10mm on right side.
Has anyone have same problem? And how you fix it?
Ville
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Posted: Mon Apr 28, 2008 6:15 pm
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| xen-uno Joined: 27 Jul 2005 Total posts: 845 |
With an offset front sprocket. A 180/55-17 is about 7-1/8" wide. A 170 should be damn near 7" wide. You need to find CL of the bike then determine the distance of each sprocket face from that line. That will determine your offset. You may find that with the sprockets properly lined up, the frame is in the way. How close to the tire edge is the chain now?
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Posted: Mon Apr 28, 2008 6:24 pm
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whitelc Daily Burner Joined: 16 Aug 2003 Total posts: 154 Location: Jyväskylä, Finland |
It's ypvs engine in ypvs frame? Do you have the half-circle shaped rubber spacers around the engine bolts?
One should be front-left and the other at the rear bolt on the right. If they are the wrong way around they might turn the engine a bit to the left?
Mikko
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Posted: Mon Apr 28, 2008 7:49 pm
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| xen-uno Joined: 27 Jul 2005 Total posts: 845 |
They don't wear out though the rubber may fall apart. They look and feel pristine in my '84's. If stock engine in stock frame, with a 170, then you must have a non-stock rear wheel which would place the rear sprocket further out. Engine may look crooked, but it is the chain running diagonal (relative to bike CL) from sprocket to sprocket.
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Posted: Mon Apr 28, 2008 9:54 pm
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| p51bombay Joined: 23 Jan 2004 Total posts: 10151 |
| xen-uno wrote: |
| with a 170, then you must have a non-stock rear wheel |
One would think 
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Posted: Mon Apr 28, 2008 10:33 pm
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WillevilSuburban Commuter Joined: 12 Jun 2004 Total posts: 92 Location: Korso-Finland |
In this case there is no problem with chainline it self. I have checked it, and its close enought. But as i said i can see engine is turned bit left. Or if i understand it right rear end has moved to right. I must check those spacers what Mikko mentioned, but i think in my case movement is so big these cannot be answer. Last year i drive with narrow rear tyre, and when i look my old front sprocket there is signs of same problem.
My opinion in this time is rear engine mount rubber. I use this bike for wheelies and burnouts, and i use clutch very hard. I think this might try to turn engine a little by little. I surprised no one else has problem like this.
And anyway i take engine out of frame today and take little bit away from left side of mount rubbers inner tube.
Ville
ps. rear wheel is from ZXR-400 and i machined sprocket facing on wheel case, and no my chains are as close tyre side as they can be. Front sprocket is 10mm offset.
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Posted: Tue Apr 29, 2008 5:53 am
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Georg Powerband Master Joined: 04 Aug 2003 Total posts: 575 Location: Jyväskylä,FINLAND |
The engine mounting rubbers are quite tough stuff but maybe they're a bit worn due to heavily tuned engine and hooligan type driving style. 
If you are about to change the rubbers I can assure you it's one s*itty job. The rubbers are sitting extremely tight and you need to make a special tool to remove/fit those rubbers. Using bench press will ease the job I guess.
Maybe making some correct spacers to fit between mounting rubber metal tubes and frame will sort the misaligning. Worth a try IMO.
-Jori-
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Posted: Tue Apr 29, 2008 6:17 am
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Billy One-handed Stoppie! Joined: 12 Oct 2007 Total posts: 2490 Location: Sweden arise! |
I wouldn't be surprised if the engine are twisting in the frame, i think the engine mountings are very weak for such a powerful engine.
But on the other hand, others are running with insane engines and i guess Yamaha thought a bit about the strenght. But they still look weak. 
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Posted: Tue Apr 29, 2008 12:36 pm
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