Author Topic: change carb or no? (Read 12483 times)

The_Steve_Man · « **Reply #15 on:** April 21, 2015, 09:50:29 AM »

That was first thing I noticed was the throttle response. It is smooth power right off the bottom.

I'm glad I didn't listen to the masses. But then again I did put a go kart axle in my 3 wheeler so I'm a little different anyway.

benoladdict · « **Reply #16 on:** April 21, 2015, 10:06:09 AM »

The tmx seems to be thw norm I just spoke with him and he said it was off a 500cc snowmobile engine he put on a atv frame (deathtrap) so hes nt sure of the model but its free so its worth checking out. And I dnt want to loose throttle response Iove how my 250 is snappy and very predictable unlike the banshee which has a lightswitch p.band.

benoladdict · « **Reply #17 on:** April 21, 2015, 10:11:39 AM »

I recently lined up with a stockish yfz450 and I was beside him till about mid 3rd gear then he pulled away pretty bad he was about 50lbs lighter than me but does that sound about right? By end of 300ft. he put about 4 to 5 bikes on me

Jerry Hall · « **Reply #18 on:** April 21, 2015, 10:14:42 AM »

Quote from: benoladdict;53410

The tmx seems to be thw norm I just spoke with him and he said it was off a 500cc snowmobile engine he put on a atv frame (deathtrap) so hes nt sure of the model but its free so its worth checking out. And I dnt want to loose throttle response Iove how my 250 is snappy and very predictable unlike the banshee which has a lightswitch p.band.

Snowmobile carbs usually have small float valve seats. Small float valve seats (2.0 mm or smaller) are necessary to control the fuel flow when the fuel pressure is above 1 psi.

The fuel pressure at the carb on most gravity feel fuel systems are less than 1/2 psi. Using a float valve seat that was made for using with a fuel pump on a gravity feed fuel system will starve your engine for fuel and burn your piston.

benoladdict · « **Reply #19 on:** April 21, 2015, 10:22:44 AM »

Alrighty then so much for that idea.

benoladdict · « **Reply #20 on:** April 21, 2015, 10:29:55 AM »

Thanks for the heads up jerry a burnt piston would have made the wifes head spin

JesseA420 · « **Reply #21 on:** April 21, 2015, 10:37:25 AM »

nah that is a good thing in terms of mikunis, it is another circuit with adjustability, on keihins it is pressed in and when it gets worn the carb is shot. pick it up and get correct seat.

benoladdict · « **Reply #22 on:** April 21, 2015, 11:17:18 AM »

Im getting 3 of em a 36mm and 2 38s he thinks so ill wait and see what I have and report back with actual model numbers

benoladdict · « **Reply #23 on:** April 23, 2015, 09:39:12 PM »

So it looks like im the new owner of 38mm vm carbs research shows they arent that great. Is it worth the trouble?

Skeans1 · « **Reply #24 on:** April 23, 2015, 09:49:16 PM »

I ran a vm 44 on my zilla and it worked well

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benoladdict · « **Reply #25 on:** April 23, 2015, 09:57:08 PM »

Cool ill check it out this weekend if the weather holds