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General Two Stroke Talk / 2013 YZ250 update
« on: July 29, 2013, 01:31:10 AM »
I must say i noticed quite a difference over stock yesterday on it its much jumpier even w/ the flywheel weight in it
Like the Phoenix rising from the ashes Two Stroke Motocross is reborn!
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Very nice indeed. Good to see you didn't go with the "Updated" plastics that look like the shrouds will impale you if you fall off What made you choose the GYTR kit over standard aftermarket? In this case stealhy, hinson or wiseco etc?
ill play with that tomorrow though I will say that I had two techs from my work ride it today and both said that is normal for a 125 to bog down like that low in the low gears and that you just have to feather the clutch. I dont remember doing that with my 2003 CR and certainly dont have to with my 2013 YZ250 but two of them did say it.....any fact to this?
If you mean bog as in BUUUURRRRRRRRMMMMPPP like its jetting is rich, then those two techies are F*(king retarded and should have their licenses revoked. It is simply, not, true. If its bogging like you say it is, theres a problem and its not that the engine doesn't have cams like most 4 stonk techies these days are very quick to claim. 125s always have been and always will be very slow down low. Its only until about 8 or 9 grand (roughly) that they start making any decent, raceable power.
Now that my little rant is over, onto the problem(s). First off: the kickstarting only getting compression halfway through the stroke. Have you tried just going through the first half then releasing it and trying again? Try to find top dead centre.
Second problem: You say it runs rough and stalls easily. I would start by throwing out the gas thats in the tank and mixing some good, fresh gas with good oil @ 32:1 like the PO was apparently doing. Give that a try. Also, google around and see if you can find the manufacturers recommended mix ratio. This includes what octane rating they recommend. Then try and find the same for the idle air screw. Considering that its running an FMF pipe and shorty silencer go a little richer to be on the safe side. Oh and for future reference, I would recommend ALWAYS throwing out the gas, coolant and oil that came with the machine. Unless its your dads old bike or your brothers or something and you can be dead certain that everything is fine.
Thats a good starting point before doing anything too rash. Good luck, and post a picture of the new sparkplug after about 2 minutes of idling and riding in the boggy part of the revs.