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Forum: 50cc - 124cc 09-11-2016, 04:45 PM
Replies: 6
Views: 4,607
Posted By bull
take the cover off, scoot on center stand, rotate...

take the cover off, scoot on center stand, rotate the rear wheel by hand watch cvt, feel force required to rotate rear wheel.

then remove plug, rotate engine variator by hand (CCW) and feel for...
Forum: 50cc - 124cc 09-11-2016, 04:40 PM
Replies: 20
Views: 5,832
Posted By bull
that blk wire from the switch is the main batt...

that blk wire from the switch is the main batt power to everything.

keep the stator and reg disconnected. then disconnect everything that it connects to - the lights, flasher, horn, cdi, then...
Forum: 50cc - 124cc 09-11-2016, 11:02 AM
Replies: 6
Views: 4,607
Posted By bull
Go back to basics, check compression and cylinder...

Go back to basics, check compression and cylinder leakage test. check valve adjustment. check for excessive load / friction in wheels, cvt, brakes
Forum: 50cc - 124cc 09-10-2016, 08:05 PM
Replies: 6
Views: 4,607
Posted By bull
how does it run when on the center stand?

how does it run when on the center stand?
Forum: 50cc - 124cc 09-10-2016, 05:32 PM
Replies: 20
Views: 5,832
Posted By bull
This would be a normal expected condition and...

This would be a normal expected condition and the way to perform proper testing.

Keep the stator and regulator unplugged, reconnect the ign switch w/ key off- does the fuse blow now?

If no,...
Forum: 125cc - 249cc 09-10-2016, 10:25 AM
Replies: 10
Views: 3,002
Posted By bull
i have no idea 'where' the cone AF came from. ...

i have no idea 'where' the cone AF came from.

The ceramic color:

original- white

lean - white or almost white

proper - tan
Forum: 50cc - 124cc 09-10-2016, 10:13 AM
Replies: 20
Views: 5,832
Posted By bull
Most likely during your install of the parts you...

Most likely during your install of the parts you shorted a circuit. You should buy a 12Vdc circuit (power / logic) probe and a digital multimeter. You can buy them from Harbor Freight rather cheaply...
Forum: 50cc - 124cc 09-10-2016, 09:44 AM
Replies: 2
Views: 1,562
Posted By bull
A standard Chinese made BBK 100 (83cc) upgrade...

A standard Chinese made BBK 100 (83cc) upgrade does not need a bigger carb or performance exhaust. In those areas, all it needs is a properly jetted oem carb.

The so called performance CDI modules...
Forum: 125cc - 249cc 09-10-2016, 09:32 AM
Replies: 10
Views: 3,002
Posted By bull
You are running too lean. You can tell from the...

You are running too lean. You can tell from the color of the plug ceramic in the cylinder, or from a gas analyzer, or experience.

I have been piecing together a FrankenScoot 49cc for a scoot...
Forum: 250cc + 09-10-2016, 09:06 AM
Replies: 14
Views: 12,621
Posted By bull
Will need to know more. Is your a 250 or a 250b? ...

Will need to know more. Is your a 250 or a 250b?

IOW.. is it a Honda or Yamaha clone engine?
Forum: 50cc - 124cc 06-16-2016, 08:10 PM
Replies: 5
Views: 3,021
Posted By bull
Have any of you noticed that some 2T oils...

Have any of you noticed that some 2T oils specifically state "Not for use in autolube systems"?

The reason I ask is I have tried a few different oils in the premix and I find the Lucas Semi...
Forum: 50cc - 124cc 06-16-2016, 08:03 PM
Replies: 3
Views: 2,394
Posted By bull
The scoot has been doing well, but I was...

The scoot has been doing well, but I was unhappy with the fuel consumption. I reduced the main jet back to a 105 and increased the premix ratio to 25:1, everything is working decent but will have...
Forum: 50cc - 124cc 06-16-2016, 07:56 PM
Replies: 1
Views: 1,448
Posted By bull
as you suspected that tube is really a cooling...

as you suspected that tube is really a cooling tube, not a breather tube.
Forum: 50cc - 124cc 05-31-2016, 11:54 AM
Replies: 7
Views: 3,124
Posted By bull
I agree with you that the scooter should do more....

I agree with you that the scooter should do more. If your specs are correct, your engine is either 88 or 100 cc, and obviously while achieving 50mph, even GPS verified, is good but still somewhat...
Forum: 50cc - 124cc 05-31-2016, 11:50 AM
Replies: 2
Views: 1,388
Posted By bull
Looks like a Yamaha Jog. Look for a...

Looks like a Yamaha Jog.

Look for a manufacture plate on the scooter to identify it. The VIN might also be of help.

Looks reasonably complete and would be a decent project, but beware of the...
Forum: 50cc - 124cc 05-24-2016, 08:19 AM
Replies: 5
Views: 1,958
Posted By bull
pull the plug and check the color of the ceramic....

pull the plug and check the color of the ceramic. if black -- too rich

if tan - a/f mix is good.
Forum: 50cc - 124cc 05-24-2016, 08:12 AM
Replies: 1
Views: 1,919
Posted By bull
fix known problems first, pull all normal...

fix known problems first, pull all normal maintenance, perform all your tuning, then install a BBK if needed.

BBKs come in 4 sizes:

63cc - many of these are found from factory installations...
Forum: 50cc - 124cc 05-24-2016, 07:58 AM
Replies: 1
Views: 1,426
Posted By bull
they are inverse related

they are inverse related
Forum: 50cc - 124cc 05-24-2016, 07:56 AM
Replies: 6
Views: 1,614
Posted By bull
When you got the scoot supported, was the rear...

When you got the scoot supported, was the rear wheel/ tire squirming? How were the engine support bushings?
Forum: 50cc - 124cc 05-24-2016, 07:51 AM
Replies: 3
Views: 2,394
Posted By bull
I have taken my time to try different jetting to...

I have taken my time to try different jetting to this carb with different premix blends and tried one of the so called performance air filters.

At 35:1 premix and the performance air filter, I had...
Forum: 50cc - 124cc 05-17-2016, 07:50 AM
Replies: 10
Views: 1,985
Posted By bull
run a compression check if you don't know...

run a compression check

if you don't know how there are videos on youtube that explain the process
Forum: 50cc - 124cc 05-16-2016, 02:23 PM
Replies: 6
Views: 1,614
Posted By bull
I have not encountered even 1 of these scooters...

I have not encountered even 1 of these scooters where the tires have been properly mounted. They all squirm down the road, the tires wear uneven and cause vibrations.

to test for vibrations, get...
Forum: 50cc - 124cc 05-15-2016, 12:09 PM
Replies: 3
Views: 2,394
Posted By bull
2 Stroke BBK Upgrading and Soft Seize Fixes

I have recently started working on 2 stroke scooters and a bike. I have been upgrading the 50cc engines to 72cc and most times things go well. I hope this provides some help and insight to others.
...
Forum: 50cc - 124cc 05-15-2016, 09:55 AM
Replies: 10
Views: 1,985
Posted By bull
Put your battery on a trickle charger and allow...

Put your battery on a trickle charger and allow it to fully recharge.

Reinstall the cvt cover. Remember to lightly lubricate the starter drive bushing in the cover before installing.

Remove...
Forum: 50cc - 124cc 05-13-2016, 04:47 PM
Replies: 10
Views: 1,985
Posted By bull
based on your info, it sounds like the engine...

based on your info, it sounds like the engine seized. If that is correct and depending on your available funds you could either replace the powertrain assembly with a used one or a new one.

in my...
Showing results 1 to 25 of 257

 
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