Hard starting 330

[rsss396]

I think they should be kind of boggish because there is nothing to up the idle mechanically like on many street bikes,cars ect...
IMO its OK to check with the coolant in it with the cap off but if it leaks then pressure check the coolant system to make sure its not the leak.
I dont like allot of pressure, 6 lbs is enough IMO and as long as it holds for a couple minutes I do not worry about.
I have always done them cold not sure if a warm engine would seal better or not.

[Polonda]

Motor does not need to be warm for leak down.  Radiator cap really shouldn't matter unless you are leaking into the coolant passages.  To be safe I would take it off.  Time really doesn't matter much as long as it holds pressure for a good 5 minutes.  Last time I did mine it held 6 psi overnight.  Be careful not to put to much pressure in or you can blow seal out.

As far as the choke goes if the motor is cold the motor should rev higher when choked and then begin to,bog down once it starts to warmup. Once warm and you choke it it should bog.

[pantera1975]

So a air leak can or will make it idle hi with he choke on then?

[Polonda]

Yes it can.

the advice about the choke I just gave was how it should operate normally with no air leak.  Your best bet and safest is to do a leak down and then once we know you have no leaks we can point you in the right direction on jetting.  Trying to jet if you have a air leak is a lost cause.

[Polonda]

This is a good read on Keihin jetting.  It's also listed in the Technical Section of this board for future reference.

http://www.duncanracing.com/TechCenter/KeihinCarbJetting.pdf