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RMZ 450 Carb question
Posted July 03, 2007 - 06:04 PM
I have a 07 RMZ 450 with the only mod being a Pro Circuit Ti4 Slip On.
When you quickly wick the throttle it bogs, almost like you are going to kill it.
Is there any way to fix this?
Second, at full speed in 4th coming up to full throttle the bike starts to sputter, kind of like getting to a stutter box on a sportbike. Is it running out of fuel and larger main jet needed?
Third, a little bit of pop from the pipe on decel. The bike also did it with the stock pipe, is this a lean pop or what and whats the fix for that.
Thanks all for all the help, new to the carb game. The sportbikes all have ECU's
Posted July 04, 2007 - 07:05 AM
I'd recommend an aftermarket fuel screw by zip ty or ? I can't remember the other manufacturers. This allows you to adjust the screw w/o tools on the trail. The pop is probably a lean condition at small throttle openings. i.e. leak jet/fuel screw combination is lean. Other posts here describe the fuel screw tuning procedure. If you can't find them, PM me. Worry about the bog after you get this sorted out.
The sputter at near full throttle is probably either your needle position or your main jet but I don't know if it's lean or rich. I'd have to guess rich if it comes back to life and sounds ok at a higher rpm. But that's something you don't want to have wrong for long. If it sounds rough(poppy) at full throttle, I'd say your lean. If it gurgles, it's probably rich. You already know lean=hot=bad things.
I think in a twisted way I'll miss carb tuning when it goes away.
Posted July 04, 2007 - 07:20 AM
the bike comes with a 36 leak jet I believe. I read where the 40 is better, I will also try backing out the fuel screw about 1/8 turn or so.
Posted July 04, 2007 - 07:35 AM
Posted July 04, 2007 - 08:49 AM
My book says I have a 35 leak jet so I will check into a 40. Also says I have a 170 main so maybe I'll jump up to a 172 or so. I haven't done anything yet.
Thanks for all the help
Posted July 05, 2007 - 05:25 PM
Posted July 06, 2007 - 05:56 AM
Posted July 14, 2007 - 07:42 AM