Hi All, I've always had intermittent spark issues with my '97 M900, especially on cold start. The engine is bog standard apart from HC pistons. I've replaced the coils, leads and plugs with a CA Cycleworks kit, and the CDIs have been replaced with an Ignitech TCIP4. It's still a nightmare to start if it will start at all. My next target is the pick up coils. I've checked the resistance which is just over 95 ohms on both, I believe that's in spec? I've pulled the engine case to see if they've maybe come loose and to look at the positioning, all looks fine, but one thing I'm not sure about is the air gap. It looks to be about .5mm which again I believe is correct, but that is from the main part of the rotor, not the raised 'trigger' part. I can't get my thinnest feeler in that gap. I've read sooooo much conflicting information on what the air gap should be and where it should be measured, what's everyone else's experience? Also, any further advice on tracing this issue would be appreciated, I'm pulling my hair out now. Inspecting the pick up wires there are a few cracks in the plastic which I guess could be touching the frame somewhere and causing an issue. I'm at the point where I may as well fork out the £90 for replacement pick ups from Electrex just to rule them out. Thanks in advance, Darren.
Following with interest as mine is also pig to start from cold if left for a week or more. Replaced all the elements outside of the motor and gone through fuel system, carbs, pump, vacuum tap etc. But the pickup gap I’ve not done yet. not sure how a contactless gap on the pickup could change but over winter I may pull the cover.
Factory manual calls for 0.7 - 1.0mm on the 'higher step' but I think that's too wide? IIRC, I set mine to around 0.5mm and it's always been good, maybe yours is too close?
Many thanks, that's what I suspected. Strange thing is all the nuts are nice and tight so the pick ups don't look like they've moved. Odd. As it's already apart I think I'll order a replacement set and set the gap as you've suggested then see where I am! Thanks again, Darren.
