Trek 4500/ GP460/ 8 speed SHIFTER

[thescooterguy]

nice ! can you still adjust the sprocket alignment . even though motor mount is upside down . it looks pretty straight . here are some closeup pics of how the mount setup bolts on . you should be able to adjust chain tension or switch drive sprockets for different riding , and the pitch and toe angle on sprocket , because most bike tubes are angular not squared . you beat me to the punch on the freewheel . Ive got some threaded crank arms in the mail from sick bike parts , i have a freewheel setup all ready for them i used a scooter freewheel because it has the 4 bolt hole pattern and i will use the 8mm teeth from scooter for outer chain ring and bike 1/2 inch teeth for small inner ring , this way i can use the 8mm scooter drive sprocket on the motor. the availability on the sizes are great and cheap . and the chain is heavy
http://i480.photobucket.com/albums/rr161/thescooterguy/bikekit001.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/bikekit005.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/bikekit002.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/Picture.jpg

 

[Pezz]

nice ! can you still adjust the sprocket alignment . even though motor mount is upside down . it looks pretty straight . here are some closeup pics of how the mount setup bolts on . you should be able to adjust chain tension or switch drive sprockets for different riding , and the pitch and toe angle on sprocket , because most bike tubes are angular not squared . you beat me to the punch on the freewheel . Ive got some threaded crank arms in the mail from sick bike parts , i have a freewheel setup all ready for them i used a scooter freewheel because it has the 4 bolt hole pattern and i will use the 8mm teeth from scooter for outer chain ring and bike 1/2 inch teeth for small inner ring , this way i can use the 8mm scooter drive sprocket on the motor. the availability on the sizes are great and cheap . and the chain is heavy
http://i480.photobucket.com/albums/rr161/thescooterguy/bikekit001.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/bikekit005.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/bikekit002.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/Picture.jpg

Gee, I like the artwork of your engine mount . . . . .

 

[DetonatorTuning]

Hi Jerry,

you'd never believe how much time i spent looking at just those pics on your site before i ordered the parts !!

the BB was the only thing i hadn't seen as a potential issue.

my top tube is round, BUT the lower is OVAL and transitions from a horizontal axis at the BB to a verticle axis at the steering head. the transition is right behind the lower plate mount area.

i have a "U" channel bracket that i haven't shown yet for the bottom. it mounts to the water bottle lugs and is dead on parallel with the top tube. it will allow me a solid position to make the toe adjustment, AND have a large enough sweep of front / back movement to pop the chain up and off.

more to come, thanks
steve

 

[spad4me]

Detonator tuning said "spad4me, good to see you on the forum again, what kind of MAD WAGON

devise of doom do you have rollin' now ?"
I don't want to hijack this thread your builds expand the paradigm of motorized bicycling.

I will pm you

 

[thescooterguy]

hot !!!!

 

[Happy Valley]

Curious about the 5:1 gearbox. Any info about who and where it's made you can pass along and does it bolt up to a standard 4 hole mount with 78mm clutch drum?

 

[thescooterguy]

this is a basic scooter tranny Mitsubishi makes them but you will find them on lots of two stroke scooter motors , 33 43 49cc and also Robyn's 4 strokes , its is 5 to 1 and reverses the motor rotation for a right side drive . most scooter parts websites sell them for about 30 bucks or so .

 

[DetonatorTuning]

yes, it mounts up to the standard 4 hole mount on engines with 78mm drum.

the problem being how the clutch pack is configured and/ or how long the engine shaft is.

i could have made a spacer about 3/16" and made it fit on my engine unmodified. grinding down the keeper nut was easier for me, AND i maintained full internal clutch/ drum cantact. if i have a problem with it i'll just tighten it back up and spot weld it.

steve

 

[thescooterguy]

is that a 47 or 49cc cag motor ? does the carb have floats ,or is it a diaphragm carb with the two fuel lines.

 

[duivendyk]

There will be quite a lot of vibration transmitted to the frame, thin wall aluminum with mounting holes in it, where stresses will be concentrated has questionable fatigue resistance.Has this been considered ?