Clutch Abandon clutch set up for simplicity?

You are on social security and have 6 kids living with you an RV?
What, did you start having kids at 55 or what?
 
My friend, you're in a tough situation.
I don't know your personal issues, and
I don't want to know.

Choose your bike's parts wisely.

That's my point I'm trying to get across.

Sometimes it makes more sense to get a motorcycle or moped.

Not just for you, but anyone delving into motorized bicycles.

Good luck.
 
The whole topic of this thread was, 'Abandoning The Clutch'.
Nothing with a running engine can sit still without a clutch.
'Nuff said I think.
 
Maybe the story would have been better driven home If Job had a motorized bike. Now were talkin trial and tribulations.
 
The OP's engine has a 3/4" shaft; unsure if there's enough hub and keyway for a 1" pulley for that shaft.

The OP MIGHT need a series of pulleys, jackshafts and/or Torq/Vertor to get the low gear ratio he desires.

The way to figure out what'd work is for him to do research and find out what worked for the many motorized bikes of similar build.

Once you find the ratio that works/worked for others, you build from there.

Take 15:1 gear ratio, as an example.
(15" sheave/1" pulley).
If that was the ratio that worked for others,
then he's way off with his present gear ratio of
4.69:1(15" sheave/3.2" crank pulley).

Try a 5"jackshaft pulley/2" crank pulley,
with a 15" sheave/2" jackshaft pulley.

(5"/2") x 7.5 = 18.75:1 ratio.

Speed of 15.42mph @ 3600rpm
would most likely climb that very steep hill.

Now to go 37.6mph @ 3600 rpm,
your gear ratio should be around
7.7:1 .

You should be able to do that with a 1.94" pulley.
Since the 2" pulley is measured at its outer circular edge,
the belt should ride lower in the pulley's groove.....

like at 1.75"-1.94" diameter.....

which is 8.57:1 or 7.73:1 gear ratios.

2" pulley:
https://www.ebay.com/itm/Chicago-Di...146914&hash=item3f7c11b593:g:8WkAAOSwInxXNmiU

1.75" pulley"
https://www.ebay.com/itm/NEW-CHICAG...079432?hash=item1e6d148208:g:12gAAOxyshFRe7NU


Now all these ratios must be adjusted when the OP removes the governor and adds a cam.

Thesignguy
 
Links to eBay may include affiliate code. If you click on an eBay link and make a purchase, this forum may earn a small commission.
The OP's engine has a 3/4" shaft; unsure if there's enough hub and keyway for a 1" pulley for that shaft.

The OP MIGHT need a series of pulleys, jackshafts and/or Torq/Vertor to get the low gear ratio he desires.

The way to figure out what'd work is for him to do research and find out what worked for the many motorized bikes of similar build.

Once you find the ratio that works/worked for others, you build from there.

Take 15:1 gear ratio, as an example.
(15" sheave/1" pulley).
If that was the ratio that worked for others,
then he's way off with his present gear ratio of
4.69:1(15" sheave/3.2" crank pulley).

Try a 5"jackshaft pulley/2" crank pulley,
with a 15" sheave/2" jackshaft pulley.

(5"/2") x 7.5 = 18.75:1 ratio.

Speed of 15.42mph @ 3600rpm
would most likely climb that very steep hill.

Now to go 37.6mph @ 3600 rpm,
your gear ratio should be around
7.7:1 .

You should be able to do that with a 1.94" pulley.
Since the 2" pulley is measured at its outer circular edge,
the belt should ride lower in the pulley's groove.....

like at 1.75"-1.94" diameter.....

which is 8.57:1 or 7.73:1 gear ratios.

2" pulley:
https://www.ebay.com/itm/Chicago-Di...146914&hash=item3f7c11b593:g:8WkAAOSwInxXNmiU

1.75" pulley"
https://www.ebay.com/itm/NEW-CHICAG...079432?hash=item1e6d148208:g:12gAAOxyshFRe7NU


Now all these ratios must be adjusted when the OP removes the governor and adds a cam.

Trouble with a 2" to 15" is slippage of the belt. Needs more circumference of the belt, to keep from slipping. Jack shaft needed.................Curt
 
Links to eBay may include affiliate code. If you click on an eBay link and make a purchase, this forum may earn a small commission.
The whole topic of this thread was, 'Abandoning The Clutch'.
Nothing with a running engine can sit still without a clutch.
'Nuff said I think.
Yep that's why you make a MANUAL CLUTCH... frees the engine. Then when you apply pressure it adds tension to a belt..
 
Yep that's why you make a MANUAL CLUTCH... frees the engine. Then when you apply pressure it adds tension to a belt..


Not all that simple, but ya. You will need belt guides to keep the belt round shape to free the engine, and not grab the pulley. Study lawn tractor and garden tractor clutch and belt guids.

BUT NO MATER WHAT YOU DO YOU NEED TO LOWER THE GEAR RATIO!.............Curt
 
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