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gs1000 bent crank?

  • Thread starter Thread starter annadel!
  • Start date Start date
A

annadel!

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I'm reassembling this engine I picked up and while lowering the barrels into place I see now that the number 1 and 4 pistons do not reach TDC at the same time. 1 is first and 4 is a few degrees later. All I can think is bent crank.
 
NOT bent it the crank spins freely in the cases. Out of phase or twisted would be the correct problem. Some came that far out from the factory. Only TRUE fix is to send it to a crank builder that SPECIALIZES in roller bearing cranks. 3 choices: John Pearson at Pearson Racing in Ohio, Stan Gardner at Gardner Racing Cranks in Maine, or Bob Mosher at Accurate Crankshaft in Florida. There is a reason I don't recommend Falicon. Best bet for HONESTY is the 3 I recommended. Ray.
 
I thought the out of phase or twisting was what people referred to as bent.

Do they actually bend too? How?
 
Bent would be if the runout is out of spec. I measured the runout on my 1000 crank and wacked it with a hammer to bring it into spec (it was only slightly out). Good fun!

 
How common is this? My 1980 GS1000G is just a little buzzy and I was concerned that it was out of phase as well. Haven't dug into much. Just noticed that I feel more vibration then I do on my 850.
 
Nessism said:
Bent would be if the runout is out of spec. I measured the runout on my 1000 crank and wacked it with a hammer to bring it into spec (it was only slightly out). Good fun!

Click to expand...


really?? you took a hammer to it?
 
thanks

thanks

Out of phase is the problem. I had it running and it had a bad vibration, it also had low and uneven compression. Too bad, the thing has very low miles, it came out of a crashed bike w/5000 miles on it. Looks new inside, so much for that!
 
JTGS850GL said:
My 1980 GS1000G is just a little buzzy and I was concerned that it was out of phase as well. Haven't dug into much. Just noticed that I feel more vibration then I do on my 850.
Click to expand...
For some reason, the 1000 and 1100 engines are a bit more buzzy than the 850 and are MUCH more picky about valve adjustment and carb sync.

If that does not fix your vibration, pull the spark plugs from #1 aand #4. Use a pencil or other slender object to follow the movement of the pistons. By slowly rotating the crank, you will easily see if they get to TDC at the same time.

.
 
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