Sorry for the bad pic but I pulled these yesterday. The pistons were also coated with 'wet' carbon. Jetting is supposed to be on the lean side according to the jetting chart but you have to milk the throttle to get it going. They look oil-fouled to me. What do you see?
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RIVERRUNNER
Active member
Check your throttle free play and check the oil cable and adjust it according to your manual! What was the temp out and what is your jetting and at what altitude?
Thanks RR. I should have stated this is my sons Indy 340 fan.
The temp was +15*F and the altitude was 9200'. The chart says for that altitude and temp it should be minimum 110 mains, which it has, needles are clipped on the very top. I think the chart is too rich, but this also looks like too much oil to me....not sure.
I'm not expecting anyone to specifically jet this sled (unless you happen to have a 340 fan), just trying to get a solid read on the plugs.
The temp was +15*F and the altitude was 9200'. The chart says for that altitude and temp it should be minimum 110 mains, which it has, needles are clipped on the very top. I think the chart is too rich, but this also looks like too much oil to me....not sure.
I'm not expecting anyone to specifically jet this sled (unless you happen to have a 340 fan), just trying to get a solid read on the plugs.
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Is that thing oil injected even or is it pre-mix? If its pre-mix, your fuel/oil ratio has too much oil. If it's oil injected, the cable may be out of adjustment or the oil pump is shot and stuck in wide open mode.
It's oil injected with the pump on the back of the case just below the carbs. I'll need to pull the carbs to get a better look at the pump. They way it is now, from what I can see, as soon as the carbs start to open the oil pump cable starts to pull on the pump lever. At WOT the oil pump just hits the stop. Sled has just over 500 miles on it...
daman
New member
What range was these plugs pulled? you need to run sled 7-800 ft in low, mid, top range, kill the engine and look.
daman said:
Damon,
The sled fired right up in the morning then was getting harder and harder to start as the day went on. It ran about mid to upper RPM range on the trail for about 7 miles then was shut down at the trailer. Fired it up about 5 minutes later and ran it on the trailer. Pulled the plugs the next day.
Are you saying to run it low RPM for about 800', then mid-RPM for the same, then WOT for the same, then kill it when you let off?
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SRXmathias
New member
Mtn-Track said:
No, you run at WOT and kill it and check and then the mid range-kill it and check and then lowspeed.
daman
New member
Right....
and when you post your pic get a close up of the electrode and ground strap a nice angle shot.
and when you post your pic get a close up of the electrode and ground strap a nice angle shot.
02ViperMtn
Member
don't you want to kill it and check the plugs at all three ranges?
daman said: