Re: two-stroke help needed
I sent this note out to a 125 list I'm on, but I thought I'd copy it here as well:
I can't get my '95 rs125 (with airbox mod) to run properly. After much inspection I think I've found/fixed several problems of my own making but I'm still no closer to getting the bike to work. My latest theory is that the problem is electrical - but I'm an idiot and usually wrong. I'll describe the symptoms in case I'm way off with my electrical theory, but we did measure the resistance and it was off, I'll get to that...
Anyways, when you rev the bike while it's warming up I get a crisp, clean throttle response. Once I get the bike warmed (> 50 degrees) up the lower revs are still clean but if I try and rev it out w/full throttle it sounds like it's stumbling and it won't rev out past 11 or so. I can rev it out pretty high (12,000 or so) as long as I don't use full throttle but more of a 'blipping.' Same thing when I get it on the track, I can get an occasional run-out to redline and the bike HAULS - but most of the time it just bogs and the revs won't move up or even drop and I bring it back in after half a lap.
Why I don't think it's a caurberation issue: The carb is clean, set properly which confirmed from the previous owner's notes. I've changed the main jets several sizes in each direction and it doesn't help the problem. I've inspected my reeds which are fine, the head and piston have been replaced with new rings, gaskets etc... also the bike makes good compression and no ugly sounds.
I finally put a meter on it yesterday at the track and noticed that all the values were roughly showing twice the resistance in Ohms that they should be. So this is where I'm going to start looking next (I wrote down the exact values but I won't have access to them tonight) but they were all about double like I said. I've already replaced the plug, plug cap, and coil to no avail. Any suggestions on where I should look next? In that every value that the manual tell you the check was off I'm thinking it's a component that it shared between all the electrical systems or the harness has a bad ground or something. Does this sound familiar to anyone or does anyone have a suggestion on where I should look next?
I'm not lost but I don't know where I am.