Viper bog after jump landings

ak ryda

ak ryda

New member
Joined
Jan 24, 2005
Messages
97
Age
46
Location
Palmer, AK
I have a 03 viper mtn with SLP tripples and buyoseen reeds with SLP recommended jetting for 0-20 degrees and sea level. Sled runs great (little hard on fuel but I will take that for running rich and not burning down) from negative 30 to 30 above and anywhere from 0-5000' but upon landing jumps it tries to die. Sled has great throttle response during regular riding and can bang the bumps with no bog problems but tries to die on every jump landing.

Does anyone have this problem? Have you found a solution for this?
Thanks guys.
 
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No one else has this problem on piped or stock vipers? I dont know if it would be float related or if it has something to do with the carbs being vented to the air box or what it could be?
 
it could be fuel sloshing around in the carbs, or does it bog really bad like the clutches over shifting. That would be more common
 
800,

I dont think it is clutch related since the sled runs fine other than the problem with trying to die upon landing jumps.

Ding,

I will pull my carbs this weekend and check out my floats. Now I just have to find out what the stock height is. I also am going to call SLP and see if they can shed any light on the problem.

Thanks guys.
 
RedDog had the same problem last weekend on hard landings (from 8'-10' or more) the engine would die & need restarted. Im thinking the float level is set to low or the hard landing is sucking fuel into the vent lines (Same problem I had when I ran the Tempa-Flow), It would have been real easy to check & see if any fuel was in the vent lines when it died but we never thought to look @ the time.

Then again it could have been in the primary because the primary spit the movable sheave bushing out of it later that day.... Maybe it was locking up & killing the motor?

I guess that dont help much! Sorry.
 
Oldcat,

I dont understand how it can be clutch related, I always thought clutches were driven by centrifigul forces and that gravity and impact wouldnt have much of an effect? I dont pretend to know everything about clutching and the problem being clutch related has never even entered my mind. Can you please explain as to how large impact landings would cause my clutches to try and bog out the motor. Unless it is like bushman said and a bushing is the culprit and the impact is doing damage to the bushing, hmmmmmm.

Looks like I have another item to remove when I pull the carbs.

Thanks again for all the help guys.
 
ak when you take the belt off just look where the belt rides in the primary @ idle on the movable sheave, I had the same bushing come out last season & seen another come out 1/4 of the way & tear up the cogs on the belt... He just got lucky & caught it before it came all the way out. Maybe if the bushing is working out it could cause a bind when the primary backshifts while not under load? Could be maybe who knows? It's worth a look. Bushman
 
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More than likely its your carbs. The float settings are probably off. I checked the floats on my cousins stock viper and they were WAY off from the specs. Now that they are adjusted correctly it uses less fuel as well. As for the killing or sputtering on impact, it is most likely because the force of the impact causes the floats to drop for a second, allowing too much fuel into the bowls that must be burnt off quickly, effectively richening the mixture for a little bit. When it is sputtering, does it act real rich? Does it smell like gas at all after the landing or when you restart it? Does it make a lot of smoke when it sputters or when you have to restart? Clutching is also a possibility, but i would check the carbs first.
 
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