2002 Viper 700 Getting Hot? - HCS Snowmobile Forums

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Old 03-01-2011, 03:46 PM   #1 (permalink)
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Question 2002 Viper 700 Getting Hot?

Guy at work Brought me his 2002 Viper 700 Too replace a piston in it that melted. Got the piston(center cyl) put it in, looked over at the Mag Side, Scored too hell too. PTO Side looked Like new. Anyway, Cleaned up the cylinders, lubed her up good, put it back together, Filled it with coolant, left the cap off and ran it at idle for probly 10 or 15 min,put the cap on, took it for a short ride, ran like a million bucks! no problem., check coolant level, good, park it, he comes too pick it up the next day. takes it for ride before he loaded it, ran great, no problems. Takes it home runs it for awhile, dies, Locked up. Gets it home, he tries it a couple days later, starts up, runs, takes it for a short ride, same thing, locks up. Im thinking it Has too be getting Hot but no coolant lights he says. ? He has a hole in one heat exchanger that leaks very slow and he always checks the coolant....Im lost....Any suggestions? Thanks.
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Old 03-03-2011, 12:12 AM   #2 (permalink)
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Stock vipers have cooling problems. That may be the problem. Does your friend have a heat exchanger in the rear? Vipers didnt come with them but people put them on vipers for extra cooling. Also you can buy an aftermarket head gasket for it from Bender Racing that also helps even out cooling.

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Old 03-04-2011, 10:43 AM   #3 (permalink)
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Pop the head off and see if the piston is melting again. The mag cyl on vipers needs the needle raised with the crappy gas these days and the hot ignition timing on Vipers. The stock head has an eddy in the cooling on the mag cyl which makes that side run even hotter. Without fixing this stuff and cruising at trail speeds (35-55mph)and running ethanol regular gas (crap gas) you are asking for a burn down again.
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Old 03-06-2011, 11:53 AM   #4 (permalink)
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Check the pump settings. throw a rear cooler and opticool head gasket on and your good to go.
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Old 03-06-2011, 03:36 PM   #5 (permalink)
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Quote:
Originally Posted by schmitty View Post
Guy at work Brought me his 2002 Viper 700 Too replace a piston in it that melted. Got the piston(center cyl) put it in, looked over at the Mag Side, Scored too hell too. PTO Side looked Like new. Anyway, Cleaned up the cylinders, lubed her up good, put it back together, Filled it with coolant, left the cap off and ran it at idle for probly 10 or 15 min,put the cap on, took it for a short ride, ran like a million bucks! no problem., check coolant level, good, park it, he comes too pick it up the next day. takes it for ride before he loaded it, ran great, no problems. Takes it home runs it for awhile, dies, Locked up. Gets it home, he tries it a couple days later, starts up, runs, takes it for a short ride, same thing, locks up. Im thinking it Has too be getting Hot but no coolant lights he says. ? He has a hole in one heat exchanger that leaks very slow and he always checks the coolant....Im lost....Any suggestions? Thanks.
Had a viper once 2003, light came on in some conditions, put rear cooler on it it was fine. That doesnt seem to explain lock up though.
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