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Posted by Tfrank59
- January 21, 2017, 18:12:39 PMQuote from: oldschool on January 21, 2017, 14:49:17 PMI have not grampsized mine (still have the stock air filter) but I have done a Dynojet mod to the carb because I don't have stock exhaust. I had pretty much the same symptoms you describe where I had to choke the bike especially in cold weather to make it run right. Troll is the one who said I need to do a carb rejet, so I deferred to his expertise and bought a Dynojet kit. Have you done that on your bike? I'm no expert but the problem you describe was what I was experiencing and rejetting my carb cured it.I posted this same problem previously. I Grampsized my 800 and followed the instructions to the letter. Now, when I am running in 4th or 5th gear, and seems to have a strong headwind, the motor sputters and chokes. I had an idea to try to pull the choke lever while its sputtering, and the motor smooths out and seems to run better. If I release the choke lever and it retracts, the motor sputters again. I don't know if I am getting too much air and need to put a baffle back into the breather, or turn the adjusting screw further out to make the air/fuel mixture richer. I need someone to enlighted me if they have had this type of problem after Grampsizing a bike.
Posted by Troll
- January 21, 2017, 18:11:32 PMClearly, you are running too lean. What needle/jet combination are you running? Did you get a DynoJet kit and install that, as per instructions? Do you have a shim under the needle, and last of all, is the diaphragm in good condition? Rubber parts wear out, and the bike is how many years old???
Posted by CDNRatMan
- January 21, 2017, 17:36:58 PMI'll have to defer this thread to another 800 rider I did not modify my airbox or anything to do with my fuel system.
Posted by oldschool
- January 21, 2017, 14:49:17 PMI posted this same problem previously. I Grampsized my 800 and followed the instructions to the letter. Now, when I am running in 4th or 5th gear, and seems to have a strong headwind, the motor sputters and chokes. I had an idea to try to pull the choke lever while its sputtering, and the motor smooths out and seems to run better. If I release the choke lever and it retracts, the motor sputters again. I don't know if I am getting too much air and need to put a baffle back into the breather, or turn the adjusting screw further out to make the air/fuel mixture richer. I need someone to enlighted me if they have had this type of problem after Grampsizing a bike.