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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Working on the front end. Horn, headlights and motoscope mini are mounted. Working on the number plate to hide everything.
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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.
 
Finalized the number plate mounting and make a new license plate mount. The cheap ebay one I had on was made from the softest aluminum I think I've ever dealt with. Bolts wouldn't stay tight, and if they did the aluminum would deform enough to let everything rattle around. The new one is a single piece of 6061 that got milled to shape.
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Think of the cheap one as a jig so you could get the angle of the dangle just right. Nice work on the new one.
 
doc_rot said:
Think of the cheap one as a jig so you could get the angle of the dangle just right. Nice work on the new one.
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Thanks. I made it from a chunk of aluminum I've had for probably 7 years or longer.
True, the cheap one let me know I did like the mount style. Shouldn't expect too much from something that's under $20.
 
The front fender looks good.. How did you have to modify your wiring harness to use that electronic tuning display on ur computer? That is pretty slick, never saw it done like that on an old bike before.
 
Luugo86 said:
The front fender looks good.. How did you have to modify your wiring harness to use that electronic tuning display on ur computer? That is pretty slick, never saw it done like that on an old bike before.
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I'm using a microsquirt ecu to control the ignition. It'll eventually go back to EFI, so keeping the trigger wheel controlled ignition with the microsquirt made sense to me. I have a 2" 36-1 wheel mounted where the advacnce unit was, it's being read by an allegro ats627 hall sensor which feeds the rpm/crank angle to the ecu. This lets it run sequential ignition with chevy LS coils. For other sensors I have a dubshop modified gm coolant temp sensor, gm 1bar map sensor, gm intake air temp sensor. No wideband hooked up currently, and once I switch back to EFI it'll use the tps from the suzuki throttle bodies.
 
Finally set up a real return spring for the rear brake. It was one of the things I wasn't happy with, but wasn't sure how to change for a while.
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Nice. It’s those details that makes bikes good to ride
 
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