Sumotrack rebuild

Sump filter is finished.
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Sendcutsend is worth using if you need some parts cut. For $30 I got 3 crank trigger wheels and 2 cam trigger wheels shipped. Parts arrived in less than a week and to size.
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Pipes are coated, packed and installed. Slowly getting closer to getting it back on the road. Next big thing will be wiring.
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Hey, I've got a question for you. Please forgive my ignorance of the XS650 but I saw on the "latest purchase" thread that you got a 270* rephase pin. Is the purpose of that to rephase the cylinders so they are going up and down opposed rather than together? I've always heard about a significant amount of vibration with these and have assumed the rephase is to settle that down.
 
ridesolo said:
Hey, I've got a question for you. Please forgive my ignorance of the XS650 but I saw on the "latest purchase" thread that you got a 270* rephase pin. Is the purpose of that to rephase the cylinders so they are going up and down opposed rather than together? I've always heard about a significant amount of vibration with these and have assumed the rephase is to settle that down.
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You can rephase an XS to 277* without a crank pin, the pin is only needed if you want a true 270*.

Stock on the XS the pistons move up and down together, on the standard 277 and 270 the pistons are about 90* off from each other, so only 1 stops at TDC or BDC at a time. It's supposed to even out power delivery, reduce cranking losses a little and change the vibration to something a little less harsh than stock.

As to if it's worth it, that depends on the rider. Some love it, some hate it.
 
Thanx, I kinna figured it was something along that line. I can't imagine I'd like that kinna vibe so smoothing things out would be an advantage.

This ol' dog still trying to learn new tricks.
 
ridesolo said:
Thanx, I kinna figured it was something along that line. I can't imagine I'd like that kinna vibe so smoothing things out would be an advantage.

This ol' dog still trying to learn new tricks.
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I'd ride a stock one before going through with a rephase. Between cam and ignition it can get spendy, and it goes up even more if you send the crank out to be done.
 
Rat_ranger said:
As to if it's worth it, that depends on the rider. Some love it, some hate it.
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think most parallel twins are 270 or 277 these days. there must be something to it otherwise the OEMs wouldn't do it.
 
doc_rot said:
think most parallel twins are 270 or 277 these days. there must be something to it otherwise the OEMs wouldn't do it.
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I think most are 270, except KTM who went 285. I wonder if they managed to get engines quieter by having the offset, or if it simplifies the crankcase ventilation. Or is it simply trying to stay relevant in a hot market.

I think some people stick to 360* engines for nostalgia or cost, and some rephase for any possible advantage or just to be a little more custom.
 
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