DanM675

Hi i bought a 97 Summit 670 and the guy said it had been running a bit rough lately and that just the carbs needed to be cleaned and that he thought it might have just had bad gas. But i siphoned out the gas and cleaned the carbs and it didn't seem to help. I can get it started but it won't rev up and if i try to rev it up it will bog down.

kccats

Clean the Carbs!

DanM675

Ok I'll clean the carbs tomorrow again but if that doesn't work any ideas.

WWTSE670

Check easy stuff like clogged inline fuel filter, take a good look at carbs too. Is it running correctly at low RPM's?


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aduck

Check compression as well. But party close attention to carbs

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93 mach1 670
02 rmk 800 162
95 powder special 580

kccats

Oh and check the carb boots!

DanM675

Not quite, after a lot of playing with the throttle i can get it to run for about 30 seconds just idling with a tinny tad of throttle every few seconds but then it will die. And in answer to Aduck yes the compression is good.

Old Man

Clogged pilot jets in the carbs.

WWTSE670

Try continually squirting fuel in with the primer. If it runs better that way then the carbs must be dirty/something's not right in the fuel system


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DanM675

Ok, so I cleaned the carbs and carb boots and it seemed to work. It was revving up and I had it going for a good minute and then it started to backfire some, and then slowly started to bog down and stopped responding to throttle, and so then... it died.

smallengineguy

Sounds like you sucked up anything that was crappy in the tank. Was there water in the fuel? Drain the bowls and try again.

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1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS
1999 Ski Doo Grand Touring

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DanM675

I don't know. And what our the bowls.

BC_Dan

Float bowls.

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WWTSE670

You can drain the carbs without removing them, theres a plug on the bottom of each carb, on the float bowl


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DanM675

Ok then I've drained the bowls both time I've cleaned the carbs.

WWTSE670

Could be worth trying to drain old gas out of tank as SEG is referring to, if there is any junk in there it isn't helping. Can you tell if it's getting either too much or not enough fuel? After it dies do the plugs look wet?


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DanM675

I already drained 6 gallons out of the fuel tank, there was a little in the bottom though. And yes after it dies the plugs are wet.

DanM675

So I'm thinking I need new rebuild kits for the carbs would all of you guys agree?.

WWTSE670

Yeah probably not a bad idea, if the plugs are wet then double check to see that the floats aren't sticking or in upside down. Sounds like it's flooding out


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DanM675

Hi guys frist I won't to thank all of you for the help. I finally got the sled running and guess what it needed...1 new piston and rings, 1 new cylinder, and a new head, and 2 new exhaust valves. and all this because the last owner did't clean the exhaust valves each year. Wow.

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1997 Ski-Doo Summit 670
SOLD- 1996 Ski-Doo formula SS 670
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Mountain riding; its a race between time and gravity!