New aluminum frame build

old motorbike · #1 04-22-2009, 09:49 AM

I haven't been posting in a while as I've had many projects. I started with a newer alum. framed bike and switched my china girl from my old store bike. I couldn't accept the vibration and decided to switch to a pocket bike motor. 49cc smooth, hi-rev, centrifugal clutch,pull start and gear reduction. The motor is light and inexpensive. Even wider there is still room to pedal easy. Should only need 1 gear with these rpms. Uses a different size (smaller) chain. Hand made an engine cradle and currently waiting for a gas tank. Have no idea how gearing (or anything) will work yet.
I assembled the old bike back together to keep it for a comparison.(and nostalgia)

**Dave31** · #2 04-22-2009, 03:17 PM

Very Nice

NEAT TIMES · #3 04-22-2009, 05:12 PM

Great Build. How Many Teeth On Chain Box Tranny Sprocket ? You May Already Know, The Box Is 3.25 : 1. About 18 To 1 Final Ratio Will Work Good. Ron

old motorbike · #4 04-22-2009, 09:45 PM

Thanks for the info, Ron. I'm not sure on teeth number, but will find out. I'm hopin the cent. clutch will be forgiving.

NEAT TIMES · #5 04-22-2009, 10:55 PM

Motorbike, That Is A Very Neat , Clean Diy Install. I Have Several Of That Very Same Eng. Did You See My Recent Diy Cvt Belt Drive Build?? I Started With That Eng. It Worked Very Well. I Had The Same Engine As Yours On A Friction Drive, But It Has The Big Bore Kit (52cc ). My Plan Was To Switch Engines, Which I Have Done. The Kit Sells Around 50 Bucks. It Changes The Engine Into A Mean Machine. Much More Compression, More Instant Power And A Different Sound. I Think You Will Like Your Build As Is. Your Rear Sprocket Appears Small. I Think You Need About 18;1 Final Ratio. Thanks For Sharing Ron

ZnsaneRyder · #6 04-24-2009, 05:58 PM

Your build has inspired me. I'm looking to build a bike with a pocketbike engine now! I just can't see getting a HappyTime, when a PocketBike engine costs similar, and it has a centrifugal clutch, and most likely MUCH more reliable!

NEAT TIMES · #7 04-24-2009, 06:43 PM

I Am Very Pleased With The Cvt Belt Drive. I`m From Wisconsin = Snowmobile Country. They Have The Belt Drive Perfected On The Snowmobiles. Pretty Much Trouble Free And High Speeeeed. The China Girls Do Look Cool. Jims New Engine Should Save Them. The Cvt Mount Is Easy To Make, I Can Post More Pics. Have Not Had To Adjust Drive Chain. On Post 21 Of Thread "engine Rpm To Cruising Speed" I Stated To Large Fillipino That He Would Like The Cvt On A 4 Wheeler so his dog could sit beside him instead of the rear dog box. Also a front wheel cvt freewheel build, I will use the salad fork first and then the hydralic fork. I See He Has A Cvt Belt Build Almost Finished On His Trike. I Just Watched His Video, He Is A Happy Camper For Sure. The Sbp Kit And The Cvt Is A Great Option, And Nu Vinci Of Course. If I Can Help, Let Me Know. Ron

noobtard · #8 04-28-2009, 01:05 PM

GRR, just when I thought I was close to having a plan for my first build.. I had to find this post and get a wrench thrown in my spokes.. grummble.

Nice bike, very interested in hearing how it runs.

old motorbike · #9 04-29-2009, 07:06 AM

Thanks fo0r the great comments. Neat times, you have a great collection and some innovative ideas. I'm waiting for parts, pull start and gearing. This is why I keep my old China Girl.

oylavabeer · #10 04-29-2009, 07:45 AM

Quote:

Originally Posted by ZnsaneRyder

Your build has inspired me. I'm looking to build a bike with a pocketbike engine now! I just can't see getting a HappyTime, when a PocketBike engine costs similar, and it has a centrifugal clutch, and most likely MUCH more reliable!

I have being having simmilar thoughts, but then I dont know iff I want to go any faster on a pushbike.