90' 650 won't start after rebuild - HCS Snowmobile Forums

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Old 02-11-2010, 04:20 PM   #1 (permalink)
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Can't get this thing started for the life of me. Been pulling my arm off for hours. There's fuel in the fuel lines up to the carbs. I'm getting just enough ignition to say that it's not hard to pull with the choke off. With the choke on I'm getting no ignition at all. Tried pouring a bit of gas down the jugs and it just flooded it.

Any ideas? All wires are connected correctly and all plugs have good blue spark.

Thanks.
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Old 02-11-2010, 08:03 PM   #2 (permalink)
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sounds like a problem in the carbs. i would start by looking at the choke see if its adjusted properly and then go into the carbs from there.
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Old 02-11-2010, 11:05 PM   #3 (permalink)
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thanks for the advice. I will take your advice and do the carbs... however... the sled ran fine before the rebuild (other than it leaning out due to clutch side crank seal bringing compression down to 90 across the board) and I didn't touch the carbs. However.... it definately won't hurt to check/clean the carbs anyway. Will post tomorrow with the results.
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Old 02-11-2010, 11:10 PM   #4 (permalink)
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Remove crankcase drain plugs.
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Old 02-12-2010, 10:15 AM   #5 (permalink)
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Removed crank case drain plugs and got about 1 tablespoon of coolant and fuel out of each (coolant was probably spillage from the rebuild). Didn't help at all.

Been spraying gas into the carbs and the first 4 or 5 pulls after that are "dead" but after 4 or 5 pulls I start to get ignition. AT BEST if I'm real lucky I'm able to get it to sputter long enough that the headlight powers up.

I'm back at it today so I'll post any Epic Fails I have throughout the day. Yesterday's epic fail was the recoil exploding.... spring pieces and plastic pieces everywhere inside the recoil housing. At that point it was Beer Thirty and the recoil had to wait until this morning.

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Old 02-12-2010, 02:04 PM   #6 (permalink)
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Ok... this is really starting to piss me off now. I've gone over, and over, and over this damn thing 50 times. As time progresses I am getting slightly longer periods of "sputter" when I pull her over but she's still hell bent on not running. I re-did the carbs for the 3rd time thinking "MAYBE something got in somewhere and plugged something up", I've drained the crank case 5 or 6 times and at most I've gotten a table spoon. The motor seems to be flooding itself out. I pull the choke and get a short sputter. pull again and nothing. Turn off the choke and get a few pulls 3 to 6 pulls of a half descent sputter like it wants to run.... then nothing. Tried holding the throttle wide open and pulling like I would if it was running good but got flooded... and not a damn fire whatsoever.

I tested the compression and it's 85 each cylinder. I realize that's low but it should be enough to fire and idle as it was running on 90 psi each cylinder before the rebuild. AND, the rings have had NO chance to seat seeings it hasn't run yet. Also, I just took a cylinder honer to the jugs to crosshatch them, I didn't send them out. So.... even though the compression is low I believe it will jump up to 100 or so if I can get the thing to fire then climb from there over the break-in period. I *Think* I've checked over everything. I put a ball primer in-line so I know the fuel system is purged from the tank to the carbs. I just don't get it.

Any help or suggestions at all would be fantastic.
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Old 02-12-2010, 04:39 PM   #7 (permalink)
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QUOTE (rvanderklok @ Feb 12 2010, 02:04 PM)
Quote:
Ok... this is really starting to piss me off now. I've gone over, and over, and over this damn thing 50 times. As time progresses I am getting slightly longer periods of "sputter" when I pull her over but she's still hell bent on not running. I re-did the carbs for the 3rd time thinking "MAYBE something got in somewhere and plugged something up", I've drained the crank case 5 or 6 times and at most I've gotten a table spoon. The motor seems to be flooding itself out. I pull the choke and get a short sputter. pull again and nothing. Turn off the choke and get a few pulls 3 to 6 pulls of a half descent sputter like it wants to run.... then nothing. Tried holding the throttle wide open and pulling like I would if it was running good but got flooded... and not a damn fire whatsoever.

I tested the compression and it's 85 each cylinder. I realize that's low but it should be enough to fire and idle as it was running on 90 psi each cylinder before the rebuild. AND, the rings have had NO chance to seat seeings it hasn't run yet. Also, I just took a cylinder honer to the jugs to crosshatch them, I didn't send them out. So.... even though the compression is low I believe it will jump up to 100 or so if I can get the thing to fire then climb from there over the break-in period. I *Think* I've checked over everything. I put a ball primer in-line so I know the fuel system is purged from the tank to the carbs. I just don't get it.

Any help or suggestions at all would be fantastic.[/b]
How come compression is so low? Seems like you went backwards with the rebuild. Compression should be around 120-125. Low compression causes very hard starting.
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Old 02-12-2010, 05:54 PM   #8 (permalink)
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I'm thinking maybe the motor was bored 20 over or something. I figured that the sled should at least run which should have pushed the compression up over 100 (I figured) once the gasses had a chance to get behind the rings and force them out to seat them.

Looks like a complete tear down again. I did compare the new pistons to the old ones and couldn't see any difference... however.... I don't have a caliper to measure them.
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Old 02-12-2010, 08:53 PM   #9 (permalink)
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yeah the low compression would definitly cause harder starts. when i have stupid problems with my machines i always start looking into big things and i never look for simple things like water in the gas? maybe there is no gas in it? haha or maybe you forgot to turn on your fuel valve? ive done that a couple times.
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