800 choking while riding

[oldschool]

Update to choking issue......I backed out the adjustment screw on bottom of carb. took it for about 100 mile run this past weekend. I did not have the sputtering issue as before. I hope this has fixed the problem but time will tell.  I appreciate your input on my problem and I will keep you guys posted.

[greenbarn]

I grampsized my 800 and did not have these problems.  Whey you said you followed the instructions - there were more than one option given in the instructions -- What size jets did you use?  Sounds like you need to increase the jet size, perhaps. 

[Tfrank59]

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.

I 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.

[Troll]

Clearly, 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???

[CDNRatMan]

  I'll have to defer this thread to another 800 rider I did not modify my airbox or anything to do with my fuel system.

[oldschool]

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.