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Mon Nov 01, 2004 9:08 pm

I just bought a 64 baja. When I bought it the guy told me it has a flat spot when you go to accelerate from a dead stop or when shifting and then accelerating. He said that the weber carb is set for an 1835 motor and the one in it is a 1641. Does anyone know how to adjust it for a 1641???

Mon Nov 01, 2004 9:45 pm

Before doing anything, take the airfilter off the carb, start the engine, use the throttle lever on the carb to rev it up to about 3000rpm and then put the palm of your hand over tightly over the top of the carb. When the engine revs fall to about 1000 remove your hand, let it rev back up and do it all again.
Doing this puts all the suction of an engine at 3000 on all the tiny passeges and holes throughout the carb, hopefully sucking any crud out of them.

I doubt having the carb set up for a 1800 would produce flat spots, as its usually lean jetting which causes flat spots

I suppose your running a 009 dizzy? Some dizzy and carb combinations can make flat spots.

Edit: As its happening under accelration it could be a problem with the acclerator pump which squirts fuel into the carb under hard acceleration.

Mon Nov 01, 2004 9:53 pm

wow thanks for the reply that is really good to know. What is lean jetting exactly??

Tue Nov 02, 2004 10:55 am

Lean jetting means the jets are to small therefore, you are getting more air than fuel needed.

I'm having same prob with a 34-pict. Been drilled a number of times but no help whatsoever. So the 3000rpm suction sounds good to me before I take the carb off and go through it. It was brand new and I have had this similiar problem from the beginning. So thanks for the reply, and thanks for putting this topic up :)

Tue Nov 02, 2004 5:10 pm

grf74 wrote: Lean jetting means the jets are to small therefore, you are getting more air than fuel needed.

I'm having same prob with a 34-pict. Been drilled a number of times but no help whatsoever. So the 3000rpm suction sounds good to me before I take the carb off and go through it. It was brand new and I have had this similiar problem from the beginning. So thanks for the reply, and thanks for putting this topic up :)

You bought the carb new?? I heard somewhere that the new solex carbs are of inferior quality and 1 in 3 will be faulty.
Id take it back to where you bought it if I was you.

Wed Nov 03, 2004 8:41 am

I have it for a lil over 2 years now, so dont think they'll take it back :P.

Just gettin the car back on the road, and gonna get the problem solved, I still have old carb if needed, but we'll see.

Thanks for the tip though.