Raptor 80 mods to race - Yamaha Raptor Forum
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post #1 of 3 (permalink) Old 10-07-2019, 10:25 PM Thread Starter
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Raptor 80 mods to race

I just picked up this 80 in pieces and I'm putting it back together. To ride motocross the local fair circuit has a 70 and 90-110 class. I was already told that I couldn't ride the 80 in the 70 class, so I'm going to have to do some upgrades to compete with the bigger engines. I'm thinking while I have it apart the first thing is boring it out to 90cc. This is .120" which is a fair amount of material to remove from that cylinder. Has anyone done this and had over heating problems?

I was shocked to find that these were strictly a free air engine, don't they have overheating problems if your driving slow doing trail riding? I guess this was the Badger engine from the 80's and I have seen several models with the same set up, so maybe not.
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post #2 of 3 (permalink) Old 10-17-2019, 11:09 AM
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Just finished a build up on my raptor 80. Did a 51mm big bore 11to1 compression ported the head, custom intake from West Cal, 20mm carb, uni air filter, pro com cdi , fmf pipe, Web Cam 246 cam, used an 86 motor with a 4 speed transmission, Put a Polaris 90 front suspension on the bike, modified the clutch to 8 balls tried 4 but clutch would slip with a heavier rider Will do about 50 mph and wheelies and donuts are easy also put itp 8x8 wheels on the rear with itp 18x9.5x8 tires used the Polaris wheels on the front has 5 inches of travel up front now, order a rear shock off e bay that works well have had no issues so far
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post #3 of 3 (permalink) Old 10-17-2019, 11:14 AM
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Photo of the front end mods
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