help with jetting

[fishingdude93]

I just got my 2000 blaster top end rebuilt. Need some help on what main jet would be a good start. It was bored out to 67.0mm with Weisco piston. I also have a twist throttle on it, no air box cover and a Uni air filter. Mixture is 32:1. Another thing, anything else need to be changed on the carb?

Thanks

 

[Wifesblaster]

Well if you have a stock pipe I would put a 250 in and plug chop it. Leave the pilot stock and leave the clip in the middle of the needle. I you have an aftermarket exhaust we will need to know which one.

 

[dirtysquared]

I'm running a very similar setup with a stock exhaust, And I Plug Chopped nice at a 260 main. But Remember Everyone is different.

 

[Herpderplol]

Did you leak test it?

 

[fishingdude93]

I know that the exhaust is an fmf exhaust but don't know which one. It came on the four wheeler when I bought it used. How do you leak test it?

 

[Wifesblaster]

I know that the exhaust is an fmf exhaust but don't know which one. It came on the four wheeler when I bought it used. How do you leak test it?

As it stands I would put a 300 main in and plug chop it. List any and all mods.

 

[Blaaster]

I know that the exhaust is an fmf exhaust but don't know which one. It came on the four wheeler when I bought it used. How do you leak test it?

FMF = #260 main
Lid off = +2 so #280
32:1 = +1 so #290
Air filter = +1 so #300

I would beleaning towards a #310 main, then plug chop.

 

[fishingdude93]

Sorry for all the questions but I want to get this engine right because we put over $400 into it. Should I change jets before I brake in the engine? I appreciate the help!

 

[Herpderplol]

What mods do you have?

pipe,carb size,air filter, air box lid on/off

LEAK TEST THE MOTOR!!
I dont care if you done want to, if you dont, you can rebuild that engine soon again!

 

[Blaaster]

Leak test, then run the suggested jets for break in.

Needle should be fine on the middle clip, use the stock 32.5 pilot jet.

Set the float level to 20 - 21.5mm and adjust the idle as per specs.

You will not be going to the main jet circuit until you have ridden 2 tanks of gas at no more than 3/4 throttle, then plug chop to refine jetting.

 

[fishingdude93]

Thanks everyone. I will let you know what happens. Just waiting on an idle kit for my motion pro twist throttle. Then I will get the leak test done, change main jet, and break it in.

 

[Blaaster]

Keep us informed, and enjoy that twist throttle.