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| Ski Doo Alpine Question; New to Grooming | |
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| Tweet Topic Started: Jan 1 2009, 10:02 AM (1,314 Views) | |
| Rick_Seebeck | Jan 1 2009, 10:02 AM Post #1 |
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Hello again, I have been grooming successfully with my 1981 Alpine/trial tenderizer combination but have hit a minor snag. When working the Alpine hard - after about an hour the Alpine engine bogs down and stalls. I can restart it with several attempts by pumping the primer knob. I pump the primer, hit the starterand the engine will fire but not run. I do this several times and it will finally take off and go. It will run great for some time but eventually will bog down and stall again. Any thoughts from other Alpine users? |
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| couchsachraga | Jan 1 2009, 10:42 AM Post #2 |
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1) Check your plugs (on my older Alpine with a 640 one plug used to foul until I replaced it, and the machine would bog down and be tough to restart (trying to initially run on only 1 cylinder) 2) Check your fuel lines (sounds like a fuel problem to me...vapor lock of sorts), esp. the vacuum line from the block to the fuel pump (since you have an '81 IIRC you have a 503 and not the 640 in there, with a Mikuni carb (older were Tillotson), and separate fuel pump. It may be round or square / rectangular). I had a problem for a while with a cracked vacuum line to the fuel pump - when it warmed up it behaved exactly as you describe. You'll want to be sure all your fuel lines are TIGHT too - sometimes they warm up and suck air, which also causes problems 3) If the above do not work, check your carb (especially if you haven't had the machine for a while). IF you have a Mikuni Carb the air screw should be turned out 1 1/2 turns (turn it all the way in, then back out). If you have the the Tillotson let me know and I'll dig out the specs for that one. If you find it's something else, let us know....the issues above are just the ones I have run in to with my '79 Alpine (640, originally with a Tillotson, now converted to a Mikuni) and '86 Alpine (503 / Mikuni) Good luck! |
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| tolson | Jan 2 2009, 12:54 AM Post #3 |
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I agree with couchsachraga - this sounds similar to spark plug and fuel line problems I had with an '86 Alpine. Make sure the spark plugs are tight - I had one that actually worked it's self all the way out and came out of the hole! Needless to say, the engine was running rough with a loss of power! Nothing like trying to get a spark plug back into the hole on a hot engine in the middle of the woods, in the dark, when it's 0 degrees! But start with new spark plugs, because that's the easiest and cheapest fix. Then check all the fuel lines. Look for fresh wet spot where fuel is dripping and follow that along the fuel lines. I your Alpine is like the ones I've had in the past, it also would help to clean the frame under the carbs, engine, etc. These areas usually collect moisture from snow, pine needles, rubber from drive belts, fuel, oil, etc. It can be quite the gunky mess and it makes it hard to tell what's a fresh leak and what's just part of the old mess. |
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| Smooth Operator | Jan 5 2009, 12:29 AM Post #4 |
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We have had this happen with all our Alpines over the years. it seems to be a vapour lock. One answer seems to be to remove the black shroud/air deflector? over the carb, allowing more cooloing air flow. I also built a fuel pump cover, to try and isolate the pump from ambient engine compartment air. The pump is moved aft to the air box on the 95 model. |
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10:32 AM Jul 11