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I have a 2003 Suzuki RM 125. It seems to shift erratically when being ridden fairly hard on a motocross track. If I were to downshift into a turn, maintaining speed, using the rpm's and the clutch to keep the power to the ground, then shift up upon exit the bike seems to shift up 2 gears or sometimes up one then down again on its own. Sometimes, the bike will not shift up at all, and letting the rpm's die-off then shifting is the only way to shift up a gear. I haven't split the cases yet to examine the shift forks. Reading another post, it doesn't sound like i'd be able to see the difference anyway. Would replacing all three shift forks solve the problem? I purchased the bike new and i'm the only owner/rider of the bike. The bike hasn't been abused or taken any serious impacts. What other issues could i possibly be facing? Please advise...Thanks for your time in advance.
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The theory is to replace tranny oil at regular service intervals, common for motocrossers. Compactness of waterpump and clutch leaves no room for a dipstick measure on filler plug and no room for a sight window. Drain and measure if you sense a leak, otherwise just replace with specified amount as required.
Cheers.
For the gas tank= 2-stroke motor oil mixed at 32:1 *stock mixing ratio* [that's 32-parts gas to 1-part oil]. **[I personally use a 40:1 mixture for trail riding,..and 50:1 mixture for racing at the local MX track].
Do you "kick shift" a lot? (shift at high rpm without the clutch) or did the gear box run low on oil at any point that you know of? If so the syncros in the gear box may be worn. Probably not a do it yourself fix, unless you are familiar with this.
Good luck. Please rate, thanks.
It is likely your jetting. If your plug is wet it's either way too rich or you are not running the engine hard enough to keep it cleaned out. The smaller 2-strokes don't like to be ridden calmly unless the jetting is spot on and even then they can load up. They were designed to be ridden hard.
This is a fairly easy thing to repair, but it's a bit complicated to learn.
I would suggest popping over to allthingsmoto (dot) com and poking around a little - tons of threads on the site about jetting and how to do it. You'll see me over there.
I will come back to you with the method for adjusting this.
If you set the power valve to open at a higher rpm or restrict the vavle from opening to its maximum then your problem will be solved.
If you do the latter though you will definately lose your power at high rpm.
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