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Got back out today. Tested, and I believe it is a coil causing the misfire. I'm going to hope it is anyway. Warmed it up and waited for it to die. Pulled it back into the shop, removed the gas tank, and fired it back up. When it was misfiring I pulled the LH Coil plug and it died right...

Sorry if I was unclear. Bad gas will definitely affect a fuel injected engine, but won't cause an "intermittent" problem that can come and go in a second. Where in a carburated engine it can gum up the float so it sticks sometimes or have globs floating in the bowl that can temporarily plug jets.

I'll clear the codes and warm it up tomorrow, then take the tank off and take a good look at the coils and plugs.

I'll have to pull the gas tank tomorrow and check the coil plugs again. I will also load test the wiring to see if there are any weak spots that might be causing the problem while I'm at it. I've had the map sensors off several times, and don't remember seeing anything broken, but will take a...

A little over 10,000 now.

Gas was fresh last april, with stabilizer. And that won't cause an intermittent problem with fuel injection. Only stored code was for crank sensor, from when I first got it back together and had the crank sensor plug mixed up with another. Plugs were new last winter, and still looked new when I...

I just pulled the left panels. I might be able to unplug the LH coil, but in order to unplug the right, I'd need to remove the seat and gas tank.

I'm back. If you've read my other thread on the head gasket, you are mostly up to date. I ended up buying a new ski-doo, mostly because I had a financial opportunity that would not come back around later. Probably not the best idea in the year with the least snow I can remember since Iraq...

After looking through the manual and the pictures of the sensor readings. I see that it does have a code stored. Code 12, for crankshaft position sensor. Although I do remember when I went to start it the first time after I got it together, that I had the crank sensor wiring mixed up. So...

No codes present (not that I've seen). Temp sensor is showing a reasonable value when not running, and I haven't figured out how to start it while in diagnostic mode, but that would help I think. It would help to see the intake pressures while running, along with the temp, but it won't start...

Yes. I adjusted the idle a couple times during the year last year, in an attempt to find my idle problem then. Then again after the head gasket, while it was running well and at temp. I have the full manual and made all of the related adjustments accordingly. I went out today to see what it...

As most know we still haven't received much snow. I've been out once with the new sled and the trails weren't good. It's been so warm this week the snow is melting. So I figured I'd take the yamaha for a spin around the fields and park it back in the shop until the temp drops again. It hasn't...

Finally have a few inches of snow and tested it out. Put a couple miles on and it seemed to run great. It did push a little coolant out, but settled about 6oz low after it cooled, and I had somehow forgotten to put the cap on all the way. I'll run it again soon, hopefully. Oil leak didn't even...

I've started it a couple more times, but we got warm weather for the last week, so I haven't riden it yet. However when I bought it in December, I was informed of one small problem. He said it had a small oil leak he never found. When I got it home, it looked like the oil cooler o-ring was...

It lives. I got the last parts. With the new tensioner on, the chain didn't slip. Got it started last night after some frustration with stuff not plugged in correctly. Apparently the crank sensor connector is the same as the acc outlet connector, and they are in the same general area. Ran nice...

It could be that simple. I have not put it together yet. Put off making a decision for too long, but ordered a new tensioner, which is apparently on backorder, due in near the end of the month. There is a guide attached under the valve cover, which could do just what you say, and keep the...

I pressurized the oil system, even that didn't tighten the chain enough. It still slips when turning the crank. I'm afraid to finish putting it together, if the chain slips while cranking, valves could smack pistons and cost a lot more to fix. I don't know if I need a new timing chain or a new...

Took almost 2 months to get the head back from the machine shop. I checked valve clearances and ordered the necessary shim blocks to adjust, and they came last week. Put the head on today, and tried to get the timing set before I gave up for the day. New shim blocks set valve clearance...

I took the head off. Combustion gas tester started turning yellow (positive for gases) after a few minutes of running/revving. Gasket had one section that looked suspect and may not have been sealing perfectly against the block. Guess I won't know until I get it back together, and probably not...