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post #1 of 14 (permalink) Old 01-11-2017, 02:22 AM Thread Starter
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Sled floods itself

Am working on a 1998 RMK 500 snowmobile (Same as the one i own). I just did a engine rebuild+top end, fuel lines (tank and all others), new carb floats, gas shut off switch. The sled runs great and works like a beast however after 1-2 hrs of riding when you shut if off for 5-10mins and try to restart it the seld is 100% flooded i checked all carb settings, shut off switch and i cant find a single issue why the sled is flooding itself after that little amount of time, any thoughts? Thanks guys!

Current Sleds
1998 Polaris RMK 500 xtra-10 (Brand new engine re-build) 200Miles
1990 50th year anniversary 500 Indy Polaris 3000Miles
1994 Indy 500 Trail sled ???Miles

RETIRED
1994 Artic Cat Jag 440 6000Miles

Went from 8 sleds down to 2 sleds riding with
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post #2 of 14 (permalink) Old 01-11-2017, 04:31 AM
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leaky seats

leaky fuel pump (leaking through the pulse hose).

choke cable to tight, runs rich and then floods.

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post #3 of 14 (permalink) Old 01-11-2017, 07:35 AM
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Did you just put new floats in or did you adjust the float?
Did you put a piece of hose on the fuel inlet and see where the float turns off?
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post #4 of 14 (permalink) Old 01-11-2017, 11:38 AM
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The heat of the engine could also be expanding the gas and flooding the engine. Try holding the throttle open a bit when pulling the rope, that may help clear the over-rich condition. That is very common on the Edge models and Gen II models with rack carbs, not as bad on the VM Mikuni carbs.. but it's worth a shot.

You could also turn the gas off when you stop, but that is a pain to do that every time. Like KC said, see if you have leaking inlet needle/seats, that may be the culprit.

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post #5 of 14 (permalink) Old 01-12-2017, 05:33 AM
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Check the other post in this section about how to adjust the floats!
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post #6 of 14 (permalink) Old 01-15-2017, 01:09 PM Thread Starter
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We replaced the floats themselfs, we couldn't find a issue with adjusting them took them to a shop and had them set 100% perfect, the fuel pump,has 0 leaks period we already checked, the choke has been adjusted multiple times to try and adjust for this issue (choke is set back to factory amount). Going up in a few days and will try the throttle trick to see if it works.
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post #7 of 14 (permalink) Old 01-15-2017, 06:11 PM
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If the carb is tuned too rich, they can be hard to start after shut down. A little throttle is needed to clear it out.

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post #8 of 14 (permalink) Old 01-16-2017, 06:52 AM
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I would still go back into the floats and check them personally!
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post #9 of 14 (permalink) Old 01-17-2017, 03:18 PM
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A known issue with the carbs was the needle valves were not seating properly, even from the factory.
A temporary solution is to turn the fuel valve off when you shut down the engine.
The permanent fix is to replace the needle valves with viton tipped one that seal better.

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post #10 of 14 (permalink) Old 01-18-2017, 07:39 AM
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Atleast check the 'level'!
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post #11 of 14 (permalink) Old 01-18-2017, 02:20 PM
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On my '96 Ultra SP triple I had to give it a little gas to start it when warm........

'05 Yamaha RX1 ER 1000
'94 Polaris Indy 440 LC
'93 Yamaha Phazer II LE 485
'96 Polaris Ultra SP 700 - SOLD!!

2016/2017 miles: 635
2015/2016 miles: N of 500/S of 1000
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2013/2014 miles: 290
2012/2013 miles: 654
2011/2012 miles: 737
The sled is fixed... Now my wallet is broke..

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post #12 of 14 (permalink) Old 01-18-2017, 03:00 PM
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Yep my sled is jetted rich so on the warmer days you have to give it a quick "blip" of the throttle while pulling it over. Some other two stroke motors like the ones in dirt bikes and stuff also need that little blip too.
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post #13 of 14 (permalink) Old 01-20-2017, 01:28 PM Thread Starter
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We just did a modification so we could shut off the gas next to the key switch instead which seemed to work. (Side note i said numerous times the carbs have been looked over there perfect.). Thanks for the help guys!

Current Sleds
1998 Polaris RMK 500 xtra-10 (Brand new engine re-build) 200Miles
1990 50th year anniversary 500 Indy Polaris 3000Miles
1994 Indy 500 Trail sled ???Miles

RETIRED
1994 Artic Cat Jag 440 6000Miles

Went from 8 sleds down to 2 sleds riding with
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post #14 of 14 (permalink) Old 02-01-2017, 10:13 AM
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the one guy mentioned the fuel pump, I had one that was ruptured but still ran well. If it is the pump it would show up on 1 plug, the cyl the pulse hose is on if it is not total broken-quick check
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