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Old 03-16-2020, 11:17 AM
Liberty_Jesus Liberty_Jesus is offline
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Default Raptor 3 build? On a budget?

I'm fixing up my raptor 3 and I'm getting a carburetor adapter machined to fit a old 318.5 cc flathead carburetor on it (friends are nice). But what else should I add it's got a nice exhaust header it's got a crane cams 91018 cam and I'm trying to keep it cheap so squeezing every last drop of performance out of the stock components! But I'm new to this only been repairing engines never modifing them too much past a governor removal. I only just began my first piston ring replacement. So how can I get the most out of this engine for my money? I'm thinking porting and polishing, shaving the eyebrows, a bit of cleaning up the carbon buildup, maybe I mean maybe an arc flywheel for safety if I can afford it. Now this is for the future I just want to get the engine running now but yeah if there's other things I can do let me know!
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Old 03-16-2020, 11:25 AM
mckutzy mckutzy is offline
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Well albeit it for clones.. some might apply..

https://affordablegokarts.com/pages/performance-basics.
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Old 03-16-2020, 11:32 AM
Liberty_Jesus Liberty_Jesus is offline
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I'll take a look for sure.

---------- Post added at 01:32 PM ---------- Previous post was at 01:27 PM ----------

I think what ill do first is porting once I get it running and decide to take it all apart again and make it more powerful
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Old 03-16-2020, 12:02 PM
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JTSpeedDemon JTSpeedDemon is offline
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On these flatheads, an ARC billet rod is more important than the flywheel. The rod will go long before the flywheel(in 99% of cases). Porting and shaving eyebrows would be an excellent idea, it's free, plus flatheads love that extra flow. Since that will decrease compression a bit, it's a good idea to shave the head mating surface up to 0.03" to bump up compression(or you could get a thinner, copper head gasket).

Here's a good flathead mod guide: http://www.diygokarts.com/vb/showthread.php?t=1583

And here's a good video on P & P and shaving the eyebrows:
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Old 03-16-2020, 12:33 PM
Liberty_Jesus Liberty_Jesus is offline
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Sounds good I'll give that a watch or two
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