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Post by nova50073 on Jan 15, 2013 19:55:33 GMT -5
I just build a 60mm stroke, and 63 mm bore, 187cc , gy6 engine.\
this engine will be used for drag racing , 1/8 track, kind of got a contest going in our little town about who had the fastest scooter.
The rider weight will be about 140 lbs, wont be me , too fat.
I need advice on a good starting point for these things.
#1, roller weights
# 2 which springs for the Hit man clutch
I had the engine up to 6500 rpm today on the road out front, and it did not blow so I was happy with that. ;D
So any drag racing scooter dawgs out there,fill me in.
I used to drag race MC's in the early 90's and an old Nova in the last 10 years, but racing scooters is a new ballgame.
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Post by wangchicken on Jan 15, 2013 20:22:21 GMT -5
What carb are you using? post up some pics of what you have! do you have a scooter frame ?Welcome to the forum
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Post by prodigit on Jan 15, 2013 20:27:27 GMT -5
You need fast pickup speed, so your rollers should be on the light side.
From what I hear on the forum, on a 50cc start with 6 gram, 4 gram, and 8 gram, and mix and match. I don't know if your variator or gearing is different from the 50cc, but if it is, then these values won't be of much help to you.
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Post by nova50073 on Jan 15, 2013 21:26:50 GMT -5
The motor is a gy6 150 cc, that has a big bore 63 mm bore cyl, and a stroker crank , that is 60 mm stroke,
It comes out to 187 cc , and a little bigger cam.
It has a 30 mm flat slide carb on it now, open muffler, you know SS open baffle, with screw in plug to make it not so loud.
I work on scooters part time, and this is the bosses bike really, but he is bigger than me and he sure as hell cant ride it.
I became a member on the board about 2007, just dont post much, lurk a lot.
Come on guys , there must be riders on here that have gone to the track to play a little.
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Post by scootercapecod on Jan 16, 2013 1:32:26 GMT -5
If it's a 150 with a BBK you should drop down to 10g rollers or even 9g Dr. Pulley sliders. Gear that tranny right and you'll do burnouts without the bleach! Make sure you have the 115mm variator and matching drive plate. A good kevlar belt would be in order as well. DON'T get stuck blowing a belt on your first run! What jet size do you have in the carb AND do you have a free flow intake/ airbox?
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Post by skuttadawg on Jan 16, 2013 1:46:18 GMT -5
2k clutch springs will have a faster takeoff . You may want to research porting .
Talk with ScooterElements as he drag races and may be able to help guide you . Enjoy and be safe
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Post by Blueboy5000 on Jan 16, 2013 8:09:48 GMT -5
I'm gonna say 9g weights and 2k clutch springs. But 1500k springs would make an even snappier take off.
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Post by ryan52 on Jan 16, 2013 8:16:36 GMT -5
I'm gonna say 9g weights and 2k clutch springs. But 1500k springs would make an even snappier take off. i think thats backwars the 2k springs make a snapier takeoff. not 1500 |
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Post by buford1488 on Jan 16, 2013 8:59:08 GMT -5
the head plays a huge part..what is done to the head?
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Post by skuttadawg on Jan 16, 2013 13:28:26 GMT -5
NOS ?
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Post by Scooter Elements on Jan 16, 2013 15:52:56 GMT -5
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Post by skuttadawg on Jan 16, 2013 16:53:48 GMT -5
Is that a dyno ?
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Post by nova50073 on Jan 16, 2013 18:06:32 GMT -5
Yes that is an option, I have used it on my motorcycles and cars, but never on a motor this small |
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Post by Scooter Elements on Jan 17, 2013 9:15:37 GMT -5
Yes it is. We dyno tune our scooters! |
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Post by nova50073 on Jan 17, 2013 11:55:04 GMT -5
i47.tinypic.com/333a883.jpgYep, I have been greedy with the nitrous also, but only blew out head gaskets. I like the pictures of your bikes, they look like pro stock bikes from the NHRA!
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Post by buford1488 on Jan 17, 2013 16:33:05 GMT -5
all it takes is money!!!
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Post by 50cc on Jan 17, 2013 17:01:50 GMT -5
Also, cut 1/3 of carb's diaphragm spring for quicker throttle response.
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