Start Problem with GY6 By jaykay (Read 10,247 times)

[jaykay]

I have recently bought a used Basha GY6 Retro look scooter, and got well and truely caught.
To cut a long story short the thing is a pain to start, but once it starts it runs like a dream.

At first i thought it was a fuel issue so i changed to an electric fuel pump, no joy.
Changed the spark plug and the thing started on the button for a day and then the same problem again.
If i charge the battery up overnight it will usualy start on the 5th or 6th try

I am new to scooter mechanics although i can find my way around a car no problem.

realy need some help with this one guys, any pointers?

[Alleyoop]

Hi Jay,
Does the carb have an ENRICHER(CHOKE)? If so pull it off and see if it is working. When you take it off the PLUNGER should be retracted about 1/16-1/8 into the hole of the the ENRICHER. If the Plunger is EXTENDED out from the Hole it is not allowing extra fuel for cold starts and you need a new one.

Also it could be the valves need to be adjusted. If the intake or exhaust are tight it is looseing compression and are hard to start.
Alleyoop

[jaykay]

Cool I will take a look tomorow, thanks

[Alleyoop]

Jay,
Just in case you never saw an ENRICHER Retracted and Extended here is what it will look like:
Alleyoop

This is the RETRACTED position, it will feed extra fuel for cold starts:



This is the EXTENDED position, it will cut off the extra fuel after the motor is running for 3-4 minutes:
So if you take it off when the motor is cold and hasn't been running and it is like this, it will cause hard starting because no extra fuel is being allowed for cold starts.

[terrilee]

jaykay

yeppers what alley said

i just wanted to ask
are u former service member?
i ask because of ur "no joy" remark

havent heard that in along time

if so ty for ur service

Attachments:

[imnts2]

The GY6 engine is noted for not having stable clearances. Many of them go through a period of months - adjust the valves, run it a few minutes, hours, sometimes even days, and then off again. I have had to adjust valves on the same engine every 2 or 3 miles at times. And I am one to double check the clearances after I ajust them etc.

As a result, whenever I am trying to solve hard starting on a GY6 I start with checking compression. If you don't have a compression gauge, I recomnend one.
But if you don't want to spring for one, I would then start with valve adjustment. Even if I had personally adjusted them myself the same day. And for sure I would do that if you told me you had adjusted them because I trust very few people to do it as well as I would.

So - adjust the valves. Set them at .OO4" intake and .005" exhaust. That may be a little noisy, but you can always tighten them a little if they don't tighten themselves pretty quickly.

After you have adjusted then turn the engine over by hand a few times (Always turn the engine only clockwise( viewed from the flywheel side) and recheck . A guage .001 smaller than you set them should pass thru easily. And one .001" thicker should not go thru at all.

The first time you adjust them, remove the lock nut and the adjusting screw and clean carefully with lacquer thinner or carburator cleaner and then put a drop of blue lock tite on the screw.

Do not overtighten the valve cover bolts when you install the cover back on.

When you adjust use 2 wrenches. I use a small (2" long) vice grip to turn and hold the screw while I lock the lock nut VERY TIGHTY with a metric box end.

Here is a lead to the general procerdure:http://scootdawg.proboards.com/index.cgi?board=125ccandlarger4strokegy6&action=display&thread=22784

[jaykay]

Thanks guys, problem solved. Starts on first or second push everytime now.
Took an enricher of my wifes bike and that was the cure, now just got to get a new one to replace the one I stole before she notices lol.

Thanks for the great advice and yes I will be getting a compression gauge and check those valves, so thanks for all the figures.

Finaly no never been in the military but I am originaly from London England, Married an American and moved to AZ a few years ago, but its a saying we use a lot over there lol.

All the best guys and once again thanks for all the help.

[terrilee]

i didnt help

but your welcome ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D