Posts
3
Joined
1/20/2015
Location
San Diego, CA
US
Edited Date/Time
9/13/2015 11:14pm
So I have been riding my 2004 RMZ 250 since about 2007, at one point, every weekend. I have never really had problems with the bike until a couple years ago. She doesn't like to idle much at all and most times takes a lot of kicks to start it. recently adjusted the valves, did a carb cleaning and rebuild, and thought that would fix the problem. I figured the gas I had sitting in the tank and carb was clogging things up as it got old but it doesn't seem like that worked. After rebuilding and cleaning the carb tonight, we tried to start it up and it seemed like the idle was a little better but it still took a lot of kicks. at first there was unsteady idling but after adjusting the idle screw a bit it got smoother. still wont stay lit and takes a lot of kicks. Anyone know what I should do next?
Have you adjusted the float height?
Have the valves been replaced?
Paw Paw
You can use it to diagnose problems with the top end, and it will tell you exactly if the problem lies within the intake valves or the exhaust valves, or the piston/ring/bore.
I just had similar problems with my YZ450 and had to replace the intake valves because they were not sealing properly and were worn. The next time I do it, I will be getting the valve seats re-cut. A leak down tester will tell you for sure.
The Shop
Paw Paw the only thing out of those would be changing the float height. I have done the others. I havent replaced the valves though, just adjusted those and the shims. what does the float height change? I dont have a ton of experience tearing the bike apart. for the longest time i would just take it to shops to have them do the work because i did not have tool or access to any.
Dragoo it has not had the whole top end rebuilt.
mxrose I will look into one of those. hopefully that can tell me where i am going wrong here.
Thanks for your input guys. I am all ears for input and advice
The valves need to be checked and most likely replaced and the seats cut or replaced. How many times have the valves been re-shimmed?
The float height effects the full range of the fuel delivery. Set too high and it will flood at low rpms. Set too low and you will run out of fuel at upper rpms.
Paw Paw
Hard to start, valves are probably sinking into the head. No amount of shimming is going to help.
Post a reply to: 2004 RMZ 250 Problems