Gp-433

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lance0730

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Mar 8, 2007
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salt lake city
This guy is selling a 74-75? GP-433 and i was wondering
if anyone would know what kind of carbs i could use in it(one isnt good)
or where i could find a replacement?

Im going to purchase it for 50 bucks for a restore project
this summer.
 

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You sure could, but you would just have to figure out jetting, which takes a bit more time, rather than having an adjustable jet on a kehin or tillotson carb
 
in my opinion, If your gonna just ride it for fun - ditch the butterfly's and do a mikuni. next question is wether or not to run a single carb, or run duals like its set up for. if it just gonna be a pleasure sled, I'd just go with a single mikuni
 
I had a 1975 GP 433-G with a Tillotson from a Ski-doo TNT on it and it ran like hell. I recently found a better GP 433 G now that has it's original carb on it. I don't think I would use that thing if my life depended on it. Some of those reed valve engines will have blocks that allow dual carbs to be mounted. The 1974 Yamaha GP's, Sno-jet SST's and 75' SST's all have those. The 75' and up Yamahas, 76+ Sno-jets all have solid 2 into 1 manifolds so you have to find the older reed manifolds or do some fancy machining to run 2 carbs on them. That looks to me like it is a 1974 or 1975 carry-over GP 433-F. The gas tanks on the older ones are behind the seats and they have bogey suspensions.
 
Snojet Steve said:
I had a 1975 GP 433-G with a Tillotson from a Ski-doo TNT on it and it ran like hell. I recently found a better GP 433 G now that has it's original carb on it. I don't think I would use that thing if my life depended on it. Some of those reed valve engines will have blocks that allow dual carbs to be mounted. The 1974 Yamaha GP's, Sno-jet SST's and 75' SST's all have those. The 75' and up Yamahas, 76+ Sno-jets all have solid 2 into 1 manifolds so you have to find the older reed manifolds or do some fancy machining to run 2 carbs on them. That looks to me like it is a 1974 or 1975 carry-over GP 433-F. The gas tanks on the older ones are behind the seats and they have bogey suspensions.
Click to expand...

Very good educated guess... it is a GP 433-F (1974) it does have the 2 into 1 manifold..what is the best functioning single carb i could put on it?
 
36-38mm Mikuni would likely suffice, or a Tillotson HD. Some time would have to be spent for jetting with the mikuni, but if you can get an HD with variable mixture screws, you can adjust on the fly and be on your way a little quicker.
 
1974 Gp-433f

well, here is some of the progress i made
on the sled since i purchased it last week

P.s. anyone have an extra oil tank for sale?
 

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That sled should look nice when it's done! I like the tunnel mod! The HD 138 I had on my old GP-433-G was from a 1974-75 Ski-doo TNT 440. It had about a 5 mm bigger bore than the stock keihin so I had to grind the intake manifold a little bigger to match. It ran extremely well and the stock GP airbox matched up to the Tillotson carb.
 
I find tillotson carbs WAY easier to deal with than the stock kehins. I've been racing my 292 for 2 seasons and still have a slight bog with that kehin
 
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