Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 2, 2009 7:54:10 GMT -5
stock is 24mm and 21.5mm so it outta be a little bit of a difference.
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Post by 90GTVert on Jul 2, 2009 8:45:26 GMT -5
I would say +6.5mm and +7mm valves should make a difference. I'm thinking you'd need a bigger cam and carburetor to see the full potential of that. Maybe a 28mm to match up to the intake valve? THe bad part is that big carbs eat gas. I dropped probably 20MPG by going from 19mm to 25mm. You'd only be going from 24 to 28, but I'd have to think your mileage will still drop. The carb could be done easily later though. Since I know how you are about buying parts compulsively, if you do get a carb remember that it may need a different throttle cable depending what you get. Another CV carb should be fine with the cable, but if you switch to the standard flat or round slide carbs they usually use a smaller barrel of the carb end and different/no threads like the stocker prob has.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 2, 2009 9:00:27 GMT -5
we will try and rejet it, if no avail then ill buy another one. I dont know maybe ill get one. ill see. remember i already ordered an A10 cam.
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Post by 90GTVert on Jul 2, 2009 9:03:59 GMT -5
Oh, didn't know about the cam or forgot. Shoulda got an A8-9 I woulda thought. I dunno much about the 150s, but I thought the A10 was considered a torque cam.
I don't think you need the carb, so no worries. Just saying I would guess you'd pick up a little extra kick if you are willing to sacrifice some mileage. Smaller carbs do tend to have a nice throttle response though.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 2, 2009 12:14:19 GMT -5
im bidding on a set of jet drills so we can fine tune if neccessary....... a10 cam is supposed to be good for my big bore kit....
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 3, 2009 16:36:42 GMT -5
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Post by 90GTVert on Jul 3, 2009 18:51:42 GMT -5
What's it for a 63mm bore? What size are the valves and ports? Has this friend got any other scooter performance parts they wanna give away? ;D
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 3, 2009 22:22:36 GMT -5
yeah i think so. hes a 4stroke guy. mostly 150cc and up. ill measure the valves and ports tommorrow
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 4, 2009 9:44:57 GMT -5
ports are as follows 28 intake and 26 exhaust. valves are 29 intake and 24 exhaust
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Post by 90GTVert on Jul 4, 2009 13:18:11 GMT -5
I'd think you'd wanna stick with the eBay head then. On top of having larger valves and probably ports, it will keep your compression higher I guess... unless it's for 63mm bore too.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 4, 2009 13:37:56 GMT -5
yeah you watch its prob the same head the way my luck goes.
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Post by 90GTVert on Jul 4, 2009 14:04:44 GMT -5
at least if it is you can sell it and you'll still have this one for free.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 4, 2009 14:41:11 GMT -5
true that might end up doing that if it is the same head. do you have a valve spring compressor?
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Post by 90GTVert on Jul 4, 2009 14:56:25 GMT -5
Yes.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 4, 2009 15:11:36 GMT -5
got some aftermarket valve springs coming for the cam.
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