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| 250cc and Above Engine Tech Technical Discussion Forum for 250cc and up Engines |
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#1
07-18-2011, 02:04 PM
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250 street bike engine, wtb
I'm looking to upgrade from the 6.5hp 196cc Subaru to a 250 engine from a honda/Kawasaki etc street bike engine. I've seen a lot of 650's and 750's but I think that's too much for my manco 606. Been looking on craigslist. Are there any tips that I might need to know? I'm not really experienced with fabricating but I know a little and I have my dad to help. But if you can think of any tips or advice I would much appreciate it! Thanks
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#2
07-18-2011, 11:42 PM
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Take a look at: http://www.buggymasters.com/forum/showthread.php?t=1602 just to give you an idea- same principle for a standard chain drive.Most street bike engines won't allow the chain to go downward enough to get on the axle sprocket in a short space- so you either have to provide a jackshaft that moves the chain over to go down,chain roller/tensioner to redirect the chain downward(not what I'd do) or length in front of the axle sprocket by lengthening the swingarm. Looking at pics of that kart/buggy the rack or tube above the engine looks like it'll be in conflict with a taller engine too.You can save yourself some fab. time by finding an automatic clutch- I recall a few with some decent power, just a thought!
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#3
07-19-2011, 08:13 PM
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Oh yeah I hadn't thought of that. But to me it would be worth some extra work for a manual clutch because it would be worth the fun of having a true manual. I was also considering a trike/four wheeler engine. They would probably be easier to find maintain but not as much power. it depends on what I can find mostly
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#4
07-19-2011, 10:39 PM
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I have another piece I made that resolves the chain direction issue. I'll try to get a pic of it tomorrow, just for alternative ideas. I'm all for the ATV engine scenerio-You can have reverse!!!.You can go with air cooled so no radiator to configure.
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#6
07-20-2011, 11:23 PM
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Here's another solution for the chain drive angle correction. Took the engine drive sprocket and welded it on a shaft that fits a pillow bearing, now you just add another sprocket on the shaft that will let the chain go anywhere, even go forward if needed that clears the motor in close quarters.
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#8
07-21-2011, 12:14 AM
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That's another type jackshaft needing only 1 bearing and only 1 chain (un-proven design)- normally you'd take a chain from the engine rearward to a jackshaft that has 2 sprockets on it- then you'd have a second chain from the jackshaft down to the axle sprocket with a bearing at both ends of the jackshaft.
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#10
07-21-2011, 08:53 PM
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Good luck-
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#11
07-22-2011, 06:29 PM
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i think the jack shaft is the best way the factory setup would work just take the belt drive off and replace it with a chain sprocket
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