First Time Bike Builder

DreamRyder1963 · #1 01-02-2012, 09:42 AM

This is going to be my first motorized bike build. I am looking primary for a toy. This is more for the fun of the build and novelity of the finished product. Reliabilty is not a huge extreme for this build the most I will be riding is probably around my nighborhood. I on a very tight budget and parts will either be fabircated or salvage from other projects. I have an engine from kids motorized bike toy that had a broken frame. The frame is a simple mountain bike. I am looking for advice on what type of problems are common with a build like this, other parts I may have over looked, etc. I will post a pic of the engine and frame. Thanks for your help.

Al.Fisherman · #2 01-02-2012, 11:20 AM

Quote:

Originally Posted by DreamRyder1963

This is going to be my first motorized bike build. I am looking primary for a toy. This is more for the fun of the build and novelity of the finished product. Reliabilty is not a huge extreme for this build the most I will be riding is probably around my nighborhood. I on a very tight budget and parts will either be fabircated or salvage from other projects. I have an engine from kids motorized bike toy that had a broken frame. The frame is a simple mountain bike. I am looking for advice on what type of problems are common with a build like this, other parts I may have over looked, etc. I will post a pic of the engine and frame. Thanks for your help.

Welcome to the forum, all but 1 bike I built was to be used as a toy "fun". My first was for my son as he didn't have a drivers license but we straightened that out (lost for 14 years). For those that this will be your first build, I have compiled a list of things that “I” do before installing a Chinese HT engine on a bike frame. Some are needed and other will help with the longevity of the engine itself. Happy riding, and be safe.
https://docs.google.com/document/d/1...QUZq2qXXE/edit

DreamRyder1963 · #3 01-02-2012, 11:43 AM

I can not get ur link to work.

Al.Fisherman · #4 01-02-2012, 12:33 PM

Quote:

Originally Posted by DreamRyder1963

I can not get ur link to work.

I updated the doc yesterday..I guess it changed the link at the same time..
https://docs.google.com/document/d/1...QUZq2qXXE/edit

DreamRyder1963 · #5 01-02-2012, 12:52 PM

Thanks for the tips. I'm wondering if I need a fuel pump for this type of engine. Especially if the tank is mount higher than the carburator.

Al.Fisherman · #6 01-02-2012, 12:58 PM

Quote:

Originally Posted by DreamRyder1963

Thanks for the tips. I'm wondering if I need a fuel pump for this type of engine. Especially if the tank is mount higher than the carburator.

On these Chinese HT engines, the carburetor is fed by gravity. It takes such little fuel flow to keep up with what is burned, even at WOT.

DreamRyder1963 · #7 01-02-2012, 01:38 PM

That's good news. That has been a flaw in my design. The bike I took this off of didn't have a clutch as far as I could tell. Does this engine have one built in?

Al.Fisherman · #8 01-02-2012, 01:46 PM

Quote:

Originally Posted by DreamRyder1963

That's good news. That has been a flaw in my design. The bike I took this off of didn't have a clutch as far as I could tell. Does this engine have one built in?

One with a STANDARD clutch (has a clutch arm mounted on the handlebar) will look like this... What you are looking at is the clutch pads under the cover (behind the flywheel) on the right side. And has a arm like the one pictured just below the intake studs, in the first photo.

....

Check out this album....
http://s982.photobucket.com/albums/a...own/?start=all

5-7HEAVEN · #9 01-02-2012, 02:11 PM

Welcome, DreamRyder1963,

Your toy engine is a 43cc Mitsubishi-clone engine w/about 2hp and electric start. You SHOULD have a centrifugal clutch, maybe even a 5:1 gearbox. You should already have a saddle gas tank on your engine. That'll be good for riding at least 10 miles.

Thatsdax.com has a rear-mount ed friction drive assembly. If you DO have a gearbox attached, remove it. Then your engine will bolt directly onto it. It's the easiest drive assembly available. You should be riding around the neighborhood in a few hours.

The only extra equipment besides the engine drive kit you'll need to buy is a rear tire with flat, not mountain-bike tread.

You'll be pleasantly surprised how fast your motorized bike will run, at least 32mph with 1.5" friction roller. With a smaller-diameter roller, you'll have more low end power. Personally, I like the 1.5" roller. It might have less low end, but MUCH more than a pedal bike anyway.

Good luck and have fun.

Al.Fisherman · #10 01-02-2012, 02:44 PM

I posted thinking you had a Chinese engine, as the pictures didn't load up before my first post, now that they loaded (why I don't know) disregard my posts.