Max

[Max]

Hi Marcel,

I have checked stator (should be ok) as in manuel and mistery diodes (varistors) (should also be ok).

CDI testing was not clear, But it is the last thing which is not replaced or tested in function.

Please help me, which CDI’s can I buy as replacement??

Is one of a GT 125 also possible??

Mine is “CDI Unit Gv 125 32900H G515.

Can you recommend me an link or somethinng to get a new one??

Thanks and regards

Max

[Max]

Hi Guys,

I have tested the stator and it works well. Also ignition coils and sparkplugcaps are ok, as tested with a multimeter.

The Regulator and the CDI seem to be faulty. The reg is already on shipping, thanks again Marcel.

Can I replace my CDI with any DC CDI from Amazon?

Or can/would anyone recommend an explicit one for replacement??

[Max]

Hi Marcel,

Thanks for the info!

I am going to test the mention parts with a meter as discribed in the manuel.

Thanks again for the parts, maybe I get it this time to an end😁

[Max]

Hi Marcel,

the revs rpm reading, I heard it could be an empty battery.

[Max]

Hello Marcel,
since yesterday the speedo does not work anymore.
which part of the motorcycle is responsible for the speedo?

[Max]

Hi Marcel,

I have already done valve clearance —> everything in tolerance

Clutch —> Already replaced 🤙

—> air filter new

—> manifold orings new

Regarding the cap, just any cap from a mechanic near by, not even new I think. There were cracks in the previous cap.

How long is the shipping of the coils from the store? Caps would be good too in that case..

What do you think about the CDI?? Not possible that it causes the problem?

[Max]

Hi Guys little update

sparkplugcaps replaced, no change 🙁

Both cylinders have compression over 12 bar so engine is fine.

Maybe Cdi is defect?

what do you think?

Now I will take the carb for ultrasonic bath. And maybe replace cdi.

Regulator looks normal and I cant imagine this thing to cause my trouble with the high end power?

[Max]

Hi Guys,

huge thanks for your advice.

I will check compression and reg on friday. How much bar should the compression test give?

Thanks for your support, i can’t wait to ride the bike. 😎

[Max]

Here is the update:

60 mph problem.. at least you habe heard of it haha 😅

Still electroshocks in my hand from the wire of the front ignition coil.

How can I test if the regulator works as it should?

Thanks and best regards

Max

[Max]

Hi Marcel,

In this case I have done it wrong, but I definetly got some electric shocks through the cables. I will check die sparks as you explained, this afternoon.

[Max]

Hello Marcel,

Thank you very much for your great advice.
I checked the cables of the spark plugs and found that I get electric shocks through the cable. Especially at the front cylinder it was strong. At the same time I could not see but hear the spark on the rear cylinder.
I also made a video of the spark, you can watch it here. https://youtu.be/pfjwQTfNMLQ

I am curious what is your assessment of this.
Thanks again for your really great support.

[Max]

Hi Matt, how have you solved it?

[Max]

Hi Guys,

Everthing is build together! With slider needles both in 3 of 5 and air screws 2.5 out and 90 plus 92.5 main jets. New Air filter is build in too as well as sparkplugs.

My bike still cant rev over 7 to 8 thousand rpm. and about 70 to 80 kmh.

Im really sad surprised right now.

Any Tipps??

Max

 

[Max]

Hi Alan,

do you remember the result?
My setup was exactly the same, so seems like the carbs will be shipped as you have shown.

I think the reason for the different needles is that the rear cylinder is supposed to run a bit richer than the front one, with the same jetting.

Saludos
Max

[Max]

Hi Alan,

Thanks for your reply.

Seems like we have the same Carb, which year is your bike from?
I had only wondered, because I expected 87.5 Jets and not 82.5. I think your settings will only work if I also update my main jets.
Which sizes do you use right now?
And do you use these bigger main jets with the same slider needles?
Are there anymore new parts in your carb and how fast is your bike going with these settings?

I can’t wait to get back on the road 😀

Best regards / Saludos
Max

 

[Max]

okey actually it seems like it´s a different carb and the 82,5 is the standard main jet 😮

[Max]

Update:

in my carb were wrong pilots and main jets. Pilot 17.5 and main 82.5.

Where can I get new main jets?? And shall I go for 90, 90 front and rear or 87.5 + 87.5 like original?

I enclose you some pictures

Diaphgram seems ok right?

What are the two screws on the float chamber covers for, do they belong screwed all the way in?

 

[Max]

That method of Marcel works very well. Thanks a lot for this tipp!

 

I noticed that the slider needles are set differently and also the airscrew on the rear cylinder was only unscrewed 1 1/2 turns. Furthermore, the springs for the diaphragms have slightly different lengths.

If I now adjust the slider needles according to the forum. How far must the airsrew be unscrewed ? And both front and rear same ?

Do I still have to match the carburetors so that they run in step? If so, how can I do that without special equipment?

Thanks and regards Max

 

[Max]

Hi Alan,

Thanks a lot for your quality advice.

Regarding the slider needle adjustment, I havent done any modifications. Means Its the original Airfilter, normal spark plugs (new), and the two original main jets.

Does it even make sense for me, under this circumstances, to adjust slider needle?

Or would you say, I should change spark plugs, Airfilter, main jet and then do the needle adjustment?

Just for information:

I had a problem with reaching the high speed, the bike goes hardly up to 90 kph. Before I failed with the float hight adjustment. I checked the valves, the fuel filter, the fuel pump and the spark plugs (the distance was to big, that why I got new ones, bit couldnt try If that was the reason for no high speed because of the float hight fail)

Again thanks and have a nice sunday

Hasta Luego Amigo

Max

 

[Max]

Very good news. Do you have any tips for removing the carburetor? I am worried about the connection to the cylinder..

[Author]

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