Ok I am getting real fed up with this blaster right now. I just recently rebuilt the topend and now i can get the thing to run right. It has a stock carb, K&N filter, wiseco .20 over piston, and fmf fatty exhaust, Tors removed and oil block-off. Every time I replace the plug it will run good for a while and then start running like crap again, When i pull the plug it is all black especially on half of the plug as if its too rich, but that wouldn't make sense because there is a 270 main in it, which seems like it should be lean with my mods. So I was thinking it has something to do with the carb, so i just ordered a rebuild kit, but after checking for spark again, it seems like its irradic, like its not consistent, so im thinking that would either be from a bad stator or coil or something else. But if it ran good with the new plug then it wouldn't be any of those things. Im just really confused hopefully u guys have some suggestions
Blaster running like crap, need help
- Thread starter mtbshredder
- Start date
is your lid on? if it is take it off and try it, if it runs good then you know you are too rich and need to drop the main a little. wheres your airscrew currently at? with no lid, k&N, fatty pipe i belive i was around the 280 mark but if your lid is on you prolly need to be in the 250-60 range.
Both good advice^^^^since you are still a bit unsure of the details. Certainly it sounds more like the carb, give it a good cleaning, but a weak spark would foul the plug after a bit, too. Here is the manual, it gives all the info on the electrical tests. Easy to do if you have a meter. Start on page 7-9.
www.rydindirty.com/blastermanual.pdf
www.rydindirty.com/blastermanual.pdf
So I finally got my carb rebuild kit, and took apart the carb and cleaned everything, adjusted the float height a little bit, put it all back together with a new spark plug and it was running alot better. I think it still needs to be jetted correctly, it seems a bit sluggish on the bottom end, would that be the pilot?
Very possible. You might need a slightly larger pilot or it might still be a bit dirty. The pilot jet has a very small hole and passage, both of which plug very easily. Also, the main nozzle (item 6, pg 5-1 of manual) has a lot of little holes that get plugged. Most people don't even know this comes out. One other possibility is the needle, did you remove the clip on it and maybe reinstall in the wrong position?
