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I recently installed a dyno jet kit in my 04 Rincon and I seem to have lost power as a result of the changes. I replaced the spring and needle (washer/clip on slot #1, etc) with no problems then replaced the main jet with the #140 jet. I live and ride at around 8000' above sea level which the #140 is rated for above 6000'. I closed the air/fuel mixture screw then backed it out 2.5 turns as suggested by the instruction manual. The bike starts and idles fine. Through 1st gear everthing seems pretty normal. About a quarter to half way through 2nd gear throttle response lags and doesnt have the power it once had with the stock jet set for 3000' above sea level. Third gear well....is a pooch. I did notice that when I closed the air/fuel mixture screw that it was out only 1.75 turns from being closed. I'm concerned that if I close it much more that I will run too lean and cause damage to the engine. The bike doesn't seem to be running rich but I'm no mechanic and not absolutely sure of that. When I place my hand at the tail pipe while the bike is running - and even giving it some throttle there doesn't seem to be any excessive fuel coming out the tail pipe. Any thoughts or suggestions would greatly be appreciated.
 

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QUOTE ("rooferdude7":2h4pmhvo)
I recently installed a dyno jet kit in my 04 Rincon and I seem to have lost power as a result of the changes. I replaced the spring and needle (washer/clip on slot #1, etc) with no problems then replaced the main jet with the #140 jet. I live and ride at around 8000' above sea level which the #140 is rated for above 6000'. I closed the air/fuel mixture screw then backed it out 2.5 turns as suggested by the instruction manual. The bike starts and idles fine. Through 1st gear everthing seems pretty normal. About a quarter to half way through 2nd gear throttle response lags and doesnt have the power it once had with the stock jet set for 3000' above sea level. Third gear well....is a pooch. I did notice that when I closed the air/fuel mixture screw that it was out only 1.75 turns from being closed. I'm concerned that if I close it much more that I will run too lean and cause damage to the engine. The bike doesn't seem to be running rich but I'm no mechanic and not absolutely sure of that. When I place my hand at the tail pipe while the bike is running - and even giving it some throttle there doesn't seem to be any excessive fuel coming out the tail pipe. Any thoughts or suggestions would greatly be appreciated.
Sounds to me like the main jet is too big.
 

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get a K&N and call dynojet they are very helpful they got mine running perfect
 
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