I bought this 85 GS yesterday for a GREAT deal. I was told the only thing wrong was a snapped throttle cable. Check it out, and when I get there, I noticed it already had a holley carb, RB manifold, and full true dual RB exhaust. SWEET... And some other choice upgrades I keep finding...The guy didn't have a battery so i never even tried to start it. I figure, at this price, I'm taking it no matter what...



So today I fix the throttle cable and change the plugs, then do a few other precautionary things to make sure I don't ruin it on the first start up. Including spraying a bit of carb cleaner into the carb before start up. I have no idea how long it's been since it's been cranked over... Turn the key, it starts right up runs for a few seconds then dies. Try to restart, no go. Spray some more carb cleaner, boom... cranks up just fine. I continue to spray a bit of carb cleaner before each time I start it or it will not start up. So I turn the idle screw so the carb is a bit more open for start up, it cranks up and holds idle clean at 2500 for a little while then starts to die out as I am turning the idle screw down. I do this a few times and every now and again, I try to throttle it (all of this done standing over the engine, not with the gas pedal) it I throttle it really soft, it will rev up smoothly. But i have to do it very slow. if I just try and throttle it, it just bogs and wants to die.



It never stayed running on it's on more than one minute. And it will only start if I spray some carb clean before hand.



I do not know if it's a 600cfm or another size, The guy didn't even know what the racing beat manifold was called... So any guesses, to large of a carb, or badly tuned and need to be rebuilt? (by rebuilt, i mean the carb, not the motor)

85 GS is a 12A, right? Isn't the Holley for that manifold like 390 cfm or something? Sounds like you might be on the right track. Other thing I'd want to check is fuel flow/pressure.

It has a holley fuel pump and regulator also. I think it is flooding it badly...



The fuel pressure was close 7 psi. And I'm pretty sure a stock or street ported 12a with a holley will only need about 3.4 psi.





From what I have seen, a holley 465cfm carb is the best choice for a stock or street ported 12a.I'll see if i can trade this 600 for a 465 locally...

I dont know how extensively, but I do know RB modifies the holly carbs to better work on a rotary. I dont know how good your results from a standard 465 holley will be.

600 on a stock port is over kill. Ive seen people drill the high speed air bleeds and idel air bleeds. Their right next to the venturies,,, i think thats what thoes things are called their pressed in. Probably just on the primary side I dont know what size their supposed to be but im sure u can tell if they have been fucked with u need. a small holley 450-5 something.



Unrelated, topic Yo man r u a part of the central florida rotary club thing? Ive heard rummors about them doing a swapp meet and or car show?????? just wondering if u had some more info since they meet out your way

Yeah, the swap meet was today. its was OK. Nobody really came looking to buy or trade. most people only came looking to sell stuff. Was a harsh market...

I have ran a 600 Holley on a stockport that ran perfectly and got 22.5 mpg. It's all in the tuning. The Holley has to run at 6-8 psi fuel pressure. If you look on the front of the airhorn on the carb, you will find a set of numbers. These will tell you what model the carb is. If the numbers are 1850-***, this would indicate a 600 cfm Holley.