Idle question

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enzo3856

enzo3856

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Question on idling and what effect a pipe has on it..

I had my CY26 in my Baja last year. Running a standard WT668 and dominator silenced pipe. Motor ran great, but I needed the idle screw turned in all the way or else it would not stay on.

This winter I moved the same motor into my DBXL. The only difference is the air filter (TGN easy clearance Baja filter, vs TGN short stack) and the pipe (silenced v2 dominator vs RCMK XCR pipe).
With the new setup it was idling way too high and I had to dial out the idle set screw almost the whole way out... I did not change anything else (needles are the same)
Just wondering why such a big difference? would the pipe affect the idle so much? or could it be atmospheric difference between summer and spring? just trying to understand...
otherwise, performance is not affected. Car is snappy and accelerates normally and strongly, no bogs.
 
enzo3856 said:
Question on idling and what effect a pipe has on it..

I had my CY26 in my Baja last year. Running a standard WT668 and dominator silenced pipe. Motor ran great, but I needed the idle screw turned in all the way or else it would not stay on.

This winter I moved the same motor into my DBXL. The only difference is the air filter (TGN easy clearance Baja filter, vs TGN short stack) and the pipe (silenced v2 dominator vs RCMK XCR pipe).
With the new setup it was idling way too high and I had to dial out the idle set screw almost the whole way out... I did not change anything else (needles are the same)
Just wondering why such a big difference? would the pipe affect the idle so much? or could it be atmospheric difference between summer and spring? just trying to understand...
otherwise, performance is not affected. Car is snappy and accelerates normally and strongly, no bogs.
Click to expand...
it will be a combination of things mate, atmospheric yes, but it wont have a massive affect,
pipe will change things, but most probable your old filter may have been over oiled and/or more restrictive,
your new filter may be more free flowing and/or less filter oil,if its running right then bash on (y)(y),
be interesting to see if and when you clean and re oil your new filter if idle needs adjusting in again,
could also be the type of filter oil you use as well,
 
spents said:
it will be a combination of things mate, atmospheric yes, but it wont have a massive affect,
pipe will change things, but most probable your old filter may have been over oiled and/or more restrictive,
your new filter may be more free flowing and/or less filter oil,if its running right then bash on (y)(y),
be interesting to see if and when you clean and re oil your new filter if idle needs adjusting in again,
could also be the type of filter oil you use as well,
Click to expand...
You might have something there...
I try to be careful and not overoil... I will see what happens when i service the filter. Right now its a factory fresh filter from DDM.

Linkages are fine. I have the throttle pushed in as low as it goes... Maybe there was a jam on the Baja?

I know when I got the baja filter, it was together with the velocity stack... I got them together... when I moved the motor I did not remove the stack, so there is no change in the gasket...

On the Baja I had the idle screw turned in otherwise it would idle too low and stall... so maybe it is just the difference in air filter? its weird in any case.
 
there is a little spring under the metering lever

the rough way is to cut 3 or 4 coils from each end which ideally gets yr pop off pressure down to about 17 psi

if u have a pressure tester its far easier and i usually get my pop off down to 17-20 psi...supposed to get better mid throttle response

Also yr metering lever needs to be absolutely flush to the carb, u can buy a walbro metering tool of fleabay
 
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