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That is the color of the plug after 5+ hours of use. Does that look like a good color, too rich or lean?

I have a stock carb, with a 67.75mm bore, and an fmf exhaust. I was wondering what jets I should use. Currently, I have stock jets and when I try to rev the bike it hits a sort of rev limiter and does not get into higher RPMs and it does not idle.

this is a little update on my 03 yamaha blaster. I have finally been able to work on it a little, but there’s still a lot of problems. as stated before, i blew up the bike(basically the machine stayed wide open with no key in it while in neutral for about 25 seconds) so i replaced the crank...

Does anyone know if there is a different CDI I can use on a 2003 blaster? I recently found out that was the issue with my quad and found it is very hard to get an OEM part and if there was a different one I can look for that would work that would be greatly appreciated.

I have a 2003 Yamaha blaster, and about 5 years ago I cracked the crankcase left by the shift lever. Now that I find myself with more time and money I have decided to try to fix it back up. I got the bike working and I got everything right (except I need to adjust the clutch because it keeps...

So in my continuous struggle to get my blaster working again, i have run into yet another problem. I have fixed the start up problem, i ended up ruining the key switch. But now my problem is when it is running. when i start it up and give it gas, the engine bogs out, and if i give it full gas...

So i have been rebuilding my Blaster, and i had it running, first kick and it started... until one day when i was running it, breaking it in i realized that i forgot the cap lock screw on the cap of the carb... So while in neutral it went into a full rev, i pulled the key and hit the kill...

Help i just rebuilt my blaster clutch, and while the atv engages the clutch, it doesn’t fully disengage when i full let go of the clutch lever. any suggestions? the wheeler goes, but acts like the clutch is still heavily engaged.

So i have a 2003 blaster, and decided to rebuild it, because i cracked the crank case. so we split the case, resealed it, then i got a new ported cylinder, new piston, new reeds, new carb, new head, and new spark plugs and it won’t start on its own. it will only start if you put gas directly...

I just purchased a port and polished, bored cylinder which is bored to 67.5mm. I am just wondering what cc that would put my blaster at. And if you have any recommendation on jet kits let me know

I have a 2003 Yamaha blaster, and I want it to be fast, powerful and look amazing. I am considering Port and polishing my Cylinder and Head, and buy a jet kit( if anyone has any suggestions on to what one i should get let me know). I have a fmf slip on pipe with a fatty pipe coming out of the...

I already have a 2001 Honda trx 400ex with jet kits, and a aftermarket pipe, alongside with a 2003 Yamaha blaster. i was wondering if the 240cc Big bore kit is worth it. i do a lot of trail riding and some flat track, and was wondering if the big bore would give me more than the trx would?