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bostonrats
Guest
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Hello to all,
I've been lucky to be able to intercept the Yosh box between appointments. Here are my observations and advice. These are opinions.
1) Don't expect to eliminate chudder.
I've yet to find a post that claims it's gone regardless of what was used, Power Commander, Yosh, etc. You may reduce it, but it's here to stay. Think of it as "Power Tremors" as it's really a series of fast explosive kicks to your pistons. While I was not able to eliminate my chudder, I was able to smooth out the power and perhaps add a bit, and without skips. Pay attention to the power band past the chudder, this seems to be helped as well as slight throttle before chudder. I tried a rich condition which did seem to smooth out the chudder a bit, my guess is that the bike was so rich there was less power and hence less chudder.
2) Make very small changes.
The Yosh box has a very coarse potentiometer. Try to “box” your settings. Go rich and test ride, go lean and test ride. Once you find the upper and lower try to fine tune inside until you get it as good as possible. Keep in mind the principal of parallax. This box is so coarse that you need to make changes the width of the line on the potentiometer. If you don’t keep your head in the same relative position each time you can’t do this. Sight the box dead on, or at least from the same angle each time.
3) Rich vs. Lean
Too rich will cause slow starting and smelly exhaust. Too lean will cause slow starting , the bike to skip, or cut out every so often. It may run ok in the garage but skip once in a 10 or 20 min ride. Get it lean and work up to no skips. Take time to be sure it won’t skip at all.
4) Use your nose.
After making adjustments and the engine settles down, (rev steady, let idle, wait a min or so…) sniff the exhaust. In the absence of a CO meter or other automotive tools, see if the exhaust smells clean or over rich.
5) Ride, Ride, Ride.
If you have luggage on your bike, take the box with you, ride around and pull over for a new setting. Try to eliminate all bucking, and those occasional skips. In the absence of a dyno, we have to guess at what’s best. It takes time and trials. Be prepared to test and make 10 or 20 changes.
6) Zero may not be Zero.
This is an aftermarket box possibly built before your motorcycle. The coarse potentiometer combined with not knowing how Suzuki programmed your bike creates a condition where zero on the Yosh may not be your original setting. There is no way to know exactly how to “go back..you can however by testing and tweaking as above.
Good luck and don’t forget to send a donation if you can to support this terrific program.
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