Coffman Sizzler setup and tuning

CRJ

CRJ

Hibernating
Location
Toronto
i think on the 44 i had i ran 135m 120p. if you can get a 701 top end, the porting is VERY different.
 
j0hnny

j0hnny

Location
detroit MI
This is just my backup ski it will stay a 650 for people that are new to all this stuff. Just need her to have a little more pep than totally stock lol
 
King Kang

King Kang

Never enough tray time...
Location
Cary, NC
j0hnny said:
Can anyone point me to jetting recommendations for this pipe.6m6 35cc Ada head. 9 15 hooker
Click to expand...

I posted the instructions from Coffman earlier in this thread and they specify the jetting for a 650. I changed the needle as they recommended and it runs perfect. I have a 9/15 hooker too, but the head is stock.
 
mattT44

mattT44

classy
Location
ATL
I'm trying to find out on my sizzler if I need open flow ports on the gasket or keep it whole. I can't find any info on that anywhere.
 

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johnboy72

johnboy72

Location
England
orangefinger said:
the Coffman's has a couple of great sweet spots with 701-760 engines, its secret lays in the water restriction and will differ with water routing dual or single... also head pipes differ with 2 or 3 pissers.
From my experience >> The pipe itself should not be dried out so much that pipes actually sizzles , a good starting point for dual cooling is to restrict head approx. 4 mm and the stinger side approx. 3 mm. ( if you don't have a flow control valve ).
Our jetting was always run with a 1.5 N/S which seemed to work better than the Coffman's suggested 2.0 N/S, but we also had a higher pilot and main.
Click to expand...
Hi there
Have you got any photos of the water rooting for dual cooling?
Thanks John
 
King Kang

King Kang

Never enough tray time...
Location
Cary, NC
Here's one way to do it.

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