1975 Yamaha GPX 433

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What was your intended objective when you started the build?

We started the build in late October of 2016. The chassis was stripped, motor went to our main sponsor Aaen performance for porting. With the objective to beat the sled we had recently been driving.

What motivated you to start your project?

We formally drove a gpx at eagle River vintage world championship 2 years prior. The sled then got a different driver so we had to build one of our own. The research we did on the old ride directly went into building our machine.

What was the most unique and creative thing you did to the sled?

Everything about the sled is unique. My favorite touches have to be the custom seat, and vintage go-kart tank for slide lube.

What are you most proud of?

I couldnt be any less proud of this machine and the determination we had building, painting, polishing, tunning, fixing at the track. We didn’t beat the sled the old sled but finished 2nd right behind him in sport mod 440 class

What do other people say about your snowmobile?

Well I haven’t herd anything bad about it, besides it looking uncomfortable.lol

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Submitted by: Dylan G

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Specifics

Classification: Wild
Make, Model & Year: 1975 Yamaha GPX 433
Time spent: The machine took 2.5 months to build
Snowmobile cost: Sled was bought for $2,000
Money spent: Who knows how much we spent. Probably would be sick if I kept track of parts and labor
Engine: Aaen performance ported. .020 over bored Assembled by Jimmy Greek racing
Intake: Piston port design 44mm bored round slide mikuni
Exhaust: Aaen performance 10-port design race pipes Roughly 107hp @ 9,800 rpm
Drivetrain: Polaris p-85 primary Arctic roller secondary Geared for 90 mph R rated track with snow stud picks and chisels
Tunnel/Chassis Modifications: Side saddle wahl fuel tank Hand made left foot sturip Closed in rear end with aluminum diamond tread. Hand made steering column and rods Hand made tail light
Suspension: Wahl brothers 20″ leaf skis 84 Polaris rear suspension with added limiting straps geometry changes Aaen performance ski shock linkage
Brakes: Hydraulic disc brakes
Finish – Paint: Polished aluminum tunnel and belly. Repaired and painted the hood in shop. Stickers made locally
Accessories: Vdo extreme tach Digatron egt Slide lube system Steering stabilizer

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