Is the Intake manifold insulator needed

[Purevil]

Like the subject, I'd like to know if the Intake manifold insulator is needed and what it actually does. This is on a gx200. I swapped in a Black Mamba Jr cam, 26lb springs, removed the gov, added alum flywheel, header, .140 emul tube, .036 jet, and intake. Now the dang thing won't start and if I use the choke, the pull start is jerked right out of my hands. So I'm looking for possible options. I do know I removed the intake manifold insulator.

Thx,
Scott

 

[Sinner70]

are you talking about this?

BSP/Clone Intake Manifold Insulator DJ-1235

Im not sure. Ive never run one with out it. I'd imagine you'd need atleast a gasket between the head and carb.

 

[Purevil]

Yep, that's it. I guess I will reinstall and see. I do have a gasket there, but...

 

[CarPlayLB]

If nothing else, it will help insulate the heat of the motor from the carb. Cool fuel means more power!

 

[Purevil]

Well, I went and reinstalled that piece and it fired right up. I can't figure it out but it's needed. She ran shitty rich and spit fuel out the carb with the .036 jet, so I went back to the stock jet and it not only fired up with one pull but runs pretty smooth. I just hope it isn't lean. I'll check the plug when I get out on it again.

 

[bikebudy]

+1 :thumbsup: it helps insulate the heat of the motor from the carb.

Heat from engine can create vapor lock in the carb.
ie; making the fuel boil, potential explosion hazard.

 

[Dragbikemini]

It port matches the intake also. Round opening to half round. If you look at insulator you can see the transition.

 

[Camjamsdad]

It's restrictive. I kinda opened it up as much as I could on the one bike. On another bike I don't have it and the bike doesn't run right, I may put it back on and try it