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main jet size

  • Thread starter Thread starter yotaman423
  • Start date Start date
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yotaman423

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ok so vance and hines reccomends going form a 115 stock jet to a 120 jet after installing there exhaust on my 80 GS850. my question is i already have a aftermarket mystery exhaust on my bike. everything is stock except for exhaust. bike bogs at 70mph if i increase the size will it fix this problem?
 
yotaman423 said:
ok so vance and hines reccomends going form a 115 stock jet to a 120 jet after installing there exhaust on my 80 GS850. my question is i already have a aftermarket mystery exhaust on my bike. everything is stock except for exhaust. bike bogs at 70mph if i increase the size will it fix this problem?
Click to expand...
Might help to try 122.5, or you could also shim the needles to help with the mid-range.

My son's 850 has what I am told is a Jardine header and a stock airbox. 120 mains work well with that pipe, but the V&H might flow a bit better, requiring larger jets.

.
 
yotaman423 said:
ok so vance and hines reccomends going form a 115 stock jet to a 120 jet after installing there exhaust on my 80 GS850. my question is i already have a aftermarket mystery exhaust on my bike. everything is stock except for exhaust. bike bogs at 70mph if i increase the size will it fix this problem?
Click to expand...

Before doing any rejet guessing, I would first do a vacuum carb synch.
If they carbs are out of synch badly, the engine will bog or die at certain throttle openings. You can not jet a bike to run well if the carburetors are all drawing different vacuum levels. Once the sych is correct, I would run the bike up to 70 to see if it still bogs.

Earl
 
Even running lean with the 115s you should still het redline though I don't recommend it.
I would try a larger main and shimming the needle but if it still bogs I'd check ignition.
 
thanks will check when the weather breaks. i think my problem was a in-line filter restricting fuel. need more test rides
 
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