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Post by florida on May 19, 2015 6:41:41 GMT -5
The exhuast bracket came loose and then I found the exhuast stud broken off a 1/4 inch inside the head!!
I bought for $400 a 2011 50cc Gmw with 5400k on it. First scooter for me. Have ridden planty of bikes though. This is for the beach and fun.
I replaced the battery, new bigger 19mm name brand carb and adjusted the valves myself. I plan on painting the plastic and the wheels myself after replacing all the tired hoses and clamps. All the mechanical before the aesthetic and high perf mods.
So, im going to use a reverse drill to remove the stud and am gonna have to remove the head. I figure i will install a bbk or just rebuild the top end because of the mileage.
There are a couple things i need to adress before i buy Nything though.
1) will a 80cc bbk decrease the mpg by alot
2) would a performance cdi and coil, air filter and drilling my current exhuast offer much more performance gain than a bbk? I am really looking for low end torque.
I heard a bbk kit is the sMe price as a new 50cc head. Is this true?
So what in your opinion would be a better route for me? Im going to take the head off regardless to get the stud out.
****i imagine members know of reputable vendors that are members here. Send me a link so I can browse a little while a work. Thx!
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Post by lain on May 19, 2015 8:14:02 GMT -5
Either replace the head with a new one since the exhaust port is on the head, unless it's a 2 stroke, or retap the hole and get a new stud. Remove the head before you tap it though, you don't wan't shavings flying in ur eye as you attempt to do it from the bottom of the scoot lol. A new head may be cheaper than a tap kit for it though, at least when I had the same exact issue I found the kit was $30 and the stud was $2, the new head was $30, easy choice. Either way, don't forget to get new gaskets, the old ones will create vacuum leaks if you try to reuse them and will ultimately destroy your engine. Either BBK or stock is purely up to you. I run 100cc BBK and get about 60-70 mpg, I fill up once a week and drive at least 10 miles a day. I think mpg is more dependant on your carb tuning than the size of the chamber where the explosions happen. Carbs draw in and mix fuel, cylinders, pistons and heads just are a space where the fuel is turned into explosions that create the power that propels you forward. This is the BBK I use: www.ebay.com/itm/like/161018154007?lpid=82 |
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Post by florida on May 19, 2015 8:38:59 GMT -5
Its a 4 stroke.
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Post by spandi on May 19, 2015 8:58:44 GMT -5
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Post by florida on May 19, 2015 9:08:33 GMT -5
Thx for the reply.
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Post by florida on May 19, 2015 9:10:21 GMT -5
I bought some quality studs and gasket off ebay
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Post by spandi on May 19, 2015 9:18:41 GMT -5
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Freshman Rider
Currently Offline
Posts: 61 
Likes: 3
Joined: Jul 9, 2014 11:56:23 GMT -5
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Post by hunter on May 19, 2015 10:57:53 GMT -5
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Post by florida on May 19, 2015 11:08:59 GMT -5
^I don't think so buddy.
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Post by ramblinman on May 19, 2015 12:17:57 GMT -5
2) would a performance cdi and coil, air filter and drilling my current exhuast offer much more performance gain than a bbk? I am really looking for low end torque.! does this scoot have a tachometer? do you know your max rpm? you can gain a lot of low end torque by installing lighter weights if your max rpm is under 7500. much cheaper and easier than a bbk. |
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Post by florida on May 19, 2015 22:47:01 GMT -5
Im getting a cheapo $12 ebay tach soon. The kind that goes around the spark plug.
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Post by florida on May 19, 2015 22:48:54 GMT -5
Thank you everyone for your help. I learned alot since starting this thread.
Thx for the replies.
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Post by onewheeldrive on May 19, 2015 22:59:21 GMT -5
It's a night and day difference with a bbk on these smaller engines-- way better accelleration and hill climbing is much better. Your overall average speed from point A to point B will be much better.
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Post by florida on May 20, 2015 13:23:31 GMT -5
It's a night and day difference with a bbk on these smaller engines-- way better accelleration and hill climbing is much better. Your overall average speed from point A to point B will be much better. [br Yea, thats what im hoping for. A quicker pace and more....."flowy" like finding the right line on a dirt bike. I moticed the other day the i have better flow on my high end mountain bike than my scooter cause of the poor acceleration. I want performance dammit. Lol |
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