So the neighbor kid had a Blaster that didn’t run, no compression, and asks me if I’d help him out. No problem, I thought. Fast forward three weeks and I’m about to lose my mind. Here’s where I’m at…
1996 Blaster Specs
K&N air filter, cleaned & oiled, airbox lid removed
Stock carb with TORS, 32.5 pilot, 250 main, needle 3rd clip, 1-½ turns out on the air screw
Injector pump removed; running on pre-mix
Floats set to 21.50mm with digital caliper
New Boyesen reeds
New crank seals
Fresh bore & hone, new .060” over piston, new gaskets
Everything torqued to spec, no air leaks
Fresh NGK B8ES gapped at .028”
Stock exhaust & silencer (kid cleaned the pipe out with Drano...lots of carbon came out)
Problem
The quad fires on the first kick and idles great, but as soon as the throttle is opened past 1/8, it falls on its face and will die if you don’t chop the throttle and drop it back down to idle. This is with no load on the engine. If you attempt to put a load on the engine by riding it, you can’t open the throttle past about 1/8 or it dies. Also with a load on the engine there is noticeable white exhaust smoke, but I haven’t noticed a stench like tranny oil. Basically, the engine likes the pilot jet, but at all other throttle openings it stalls out. I lowered the needle one clip position (clip in #2 groove) to lean the mid-range and that seemed to help, but didn’t come close to fixing the bogging problem.
Could this be the TORS? I’m going to put new pre-mix in the quad tonight, but the kid swears he used pre-mix oil at 32:1…he even acted pissed off when I suggested it could be the gas he put in it. The 250 main wouldn’t be too rich for the open airbox/K&N would it? I can’t imagine a 250 being too rich when stock is 230. Do you think it’s a center case leak? The white smoke with load on the engine doesn’t stink like tranny oil though.
I’m baffled and the kid’s mom is getting pissed, can someone shed some light on this problem, PLEASE?
1996 Blaster Specs
K&N air filter, cleaned & oiled, airbox lid removed
Stock carb with TORS, 32.5 pilot, 250 main, needle 3rd clip, 1-½ turns out on the air screw
Injector pump removed; running on pre-mix
Floats set to 21.50mm with digital caliper
New Boyesen reeds
New crank seals
Fresh bore & hone, new .060” over piston, new gaskets
Everything torqued to spec, no air leaks
Fresh NGK B8ES gapped at .028”
Stock exhaust & silencer (kid cleaned the pipe out with Drano...lots of carbon came out)
Problem
The quad fires on the first kick and idles great, but as soon as the throttle is opened past 1/8, it falls on its face and will die if you don’t chop the throttle and drop it back down to idle. This is with no load on the engine. If you attempt to put a load on the engine by riding it, you can’t open the throttle past about 1/8 or it dies. Also with a load on the engine there is noticeable white exhaust smoke, but I haven’t noticed a stench like tranny oil. Basically, the engine likes the pilot jet, but at all other throttle openings it stalls out. I lowered the needle one clip position (clip in #2 groove) to lean the mid-range and that seemed to help, but didn’t come close to fixing the bogging problem.
Could this be the TORS? I’m going to put new pre-mix in the quad tonight, but the kid swears he used pre-mix oil at 32:1…he even acted pissed off when I suggested it could be the gas he put in it. The 250 main wouldn’t be too rich for the open airbox/K&N would it? I can’t imagine a 250 being too rich when stock is 230. Do you think it’s a center case leak? The white smoke with load on the engine doesn’t stink like tranny oil though.
I’m baffled and the kid’s mom is getting pissed, can someone shed some light on this problem, PLEASE?
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