1975 gpx 433 compresson

[butch]

what is the stock compresson on a 1975 gpx 433. thankx butch

 

[YAMMIEGOD3:16]

GPX WERE PRETTY STOUT. ESPEIALLY WITH THE GYT KIT. COMPRESSION CAN REALLY VARY HERE. 3:16 (yammie tony)

 

[butch]

im working on this sled for a freind .it has 150 in each cyl . i am having a problem starting . one time it will start right up the other time it floods ?it does have the power valve carbs on it . i am trying a pair of 38s tomorrow .any thoughts on this problem . thanks BUTCH

 

[YAMMIEGOD3:16]

YA YOUR PROBLEM IN THOSE CARBS. 38 ROUND SLIDES SHOULD TAKE CARE OF IT. PROBLEY LEAKING RIGHT THROUGH DIAGRAM ON PUMPS. DRIVE YA NUTS. COMPRESSION IS REAL GOOD THOUGH. 3:16 (yammie tony)

 

[RICKYAMAHA]

Hey Yammie tony, what would be the jet setting for the 38 round slides, used without the air box.

 

[YAMMIEGOD3:16]

I START ATLEAST WITH A 380 MAINS. 3:16 (yammie tony)

 

[RICKYAMAHA]

Then why are they using 260-280 mains on 75 T-jet 440 with 36 round slides

 

[YAMMIEGOD3:16]

BIG DEFFERENCE IN SIZE AND FLOW BETWEEN A .36 mm AND A .38 mm. THATS WHY. 3:16 (yammie tony)

 

[thunderjet440]

Plus a thunderjet has a single pipe.I'm running a 370 main in my gpx,