Doing A Quick Tune On Twin 40S

[ke20 king]

Hey guys I just got my ke20 running lastnight it's a fresh motor big cam big head work done etc.

Now I got it started and it's running very lean and won't idle. Just wondering if anyone knows how to richen it up just temporary until it gets dynoed? Also when I rev it it takes awhile it get the revs back down is this because it's not timed or untuned?

 

Thanks,

[parrot]

Make sure the carbs are balanced at idle, throttle shafts aren't bent, and you carb linkage is acting evenly

[styler]

I would make sure they are set up correctly to start with and then tune,

most problems with tuning are from a bad setup to start with or worn parts.

Theres a few weber books and online guides you could check out...

[ke20 king]

Yeah it's all set up correctly... How do I richen it out?

[parrot]

You can't. Unless you have spare idle jets lying around.

 

Sure you haven't got an air leak somewhere? How did you balance them?

 

 

Edit: http://www.redlineweber.com/html/Tech/dcoe_adjustment_layout_typical_i.htm

Edited April 22, 2012 by parrot

[ke20 king]

What should the air correcting jets be set at if Anyones done them?

[snot35]

You should be able to slightly change the mixture with the idle screws, there is one above each bore. If your idle jets are way off this might not be enough though. Try to keep them the same number of turns out from seated.

[styler]

Very lean and not idle - may be related to vacuum leaks

Revs back down - may be related to not using a seperate linkage return spring or sticky cable

Edited April 23, 2012 by styler

[philbey]

maybe a silly question, but are they actually webers? Or Dellortos or solexes?

[Redwarf]

maybe a silly question, but are they actually webers? Or Dellortos or Paper weights/ Door stops/ Very small boat anchors?

Fixed.

Edited April 23, 2012 by Redwarf

[styler]

Haha classic.

[ke20 king]

Dcoe webers

[ke20 king]

Just got my hands on a timing gun and realized it's way advanced over 60 degrees and it was no room to retard. At what degrees should the distributor be timed at?

[GJM85]

Any where between 8 and 20 degrees. Depending on the engine of course. But and I say BUT!!! If the engine runs with 60 degrees of advance at low rpm i'd dare say you cam timing is out by about 3 teeth.

[GJM85]

Any where between 8 and 20 degrees. Depending on the engine of course. But and I say BUT!!! If the engine runs with 60 degrees of advance at low rpm i'd dare say you cam timing is out by about 3 teeth.

 

Now considering most engines won't run an advance so far out at idle.... i'd say the cam is likely 1 tooth retarded and the distributor has been advanced to counter this.

 

This would also cause the engine to appear lean when in fact it could be rich.

Edited April 23, 2012 by GJM85