I've been tweaking away with the YZ while I've been away. Fitted a new standard NFLR needle. Yes I have learnt I have a 2007 bike thanks to Greyracer. The bike was sold to me as a 2008 but I quickly realised it wasn't and thought it was a 2006 but Greyracer told me how to identify the difference, thanks mate. I've fiddled with the idle mixture screw too (I have installed an RFX thumb screw which allows easy adjustment), its 2.25 turns out now and the bike in my opinion is 95% there. I've done a few miles on the bike this weekend due to fitting a set of supermoto wheels and to be honest, its the most fun I've had in years. Its just ballistic in the corners. Under 100 miles and no more chicken strips on those new tyres!!
Away way, I'm still having a bit of a popping misfire at between 5-7krpm on light throttle/cruise (45-65mph) but I think I have realised what the problem is but I'll go into that later. I just wanted a bit of reassurance that the TPS is set correctly as I've just check it again tonight to put my own mind at rest. readings are as follows:
Coil resistance (Blue and Black wire) is 5.04 ohms
Coil variable resistance (Yellow and Black wire is 0.81 ohms closed and 4.06 ohms fully open
TPS voltage output (Yellow and Black wire) is 0.61vdc @ 1850rpm
The ohms reading were checked at the TPS plug and CDI plug and the voltage was checked at the CDI plug but set previously at the TPS plug so I'm guess no problems with the wiring loom.
Does that all seem about right??
OK, back to why I think I may have realised the reason why it is still popping misfiring. Well, when I installed the new NFLR needle, for some reason I thought clip in position 3 was standard. After just checking the manual tonight, I read the clip in position 4 is standard. What's peoples opinions on this error making the difference I need to get the bike running right? I'll move the needle down in the morning and hopefully I'll get out on it tomorrow night to try it.
On a different note, I have to add, I went to start the bike tonight to check the voltage the TPS was putting out, rolled it out of the shed, cold engine, not run today, pulled the kick start out and gently pushed it down on it to feel for compression and the engine just burst into life. Ticked over beautiful too. I must have something right eh..?? lol. I'm putting it down to a couple of twists of the throttle while checking the variable resistance. Really pleased with the way it started. Would make all KTM 660 SMC owners angry that would lol.
Anyway, hopefully somebody can contribute to my findings of tonight.