Hi all.
Thanks for all the recommendations and advice. I have already solved everything and can confirm that the 80cc engine with compression can be spinned with start shoes in rear clutch.
Maybey somebady will have same issue so here are reulsts of my tests.
In my case it wast two parts.
First slipped start shoes, than slipped drive belt on…[Lees meer]

I had the same issue with my start clutch and 80cc engine. Compression was too high and start shoes slipped. I needed to improve friction of start shoes. In my case it was all about start shoes rubber compound. New start shoes Malossi and Ferodo with soft rubber which should improve friction and makes starts eaisier both slipped. So I tested very…[Lees meer]

Hello
You can try what I did.
First take off side panel and easy see what is going on.
You can see if slips drive belt or start shoes. Push the pedal and check if you feel fricton and resistence of the start shoes. If ou feel friction, bell turns but clutch not there is problem with start shoes. Or you can see that clutch turns but drive belt…[Lees meer]

Hi FonS
Thank you for your experiences and recommendation. It is very useful for me, I will test Gates drive belt. I have one question for you regarding the Multivar – are you using Multivar with original buslength or have you shortened it?

Hello Wim, Thank you.
Do you use it? Do you know if this belt will work on Multivar? There are several belts on the market 13×950-965 but I will really appreciate some already tested recommendation of belt.
Also SIP has some belt https://www.sip-scootershop.com/cs/product/remen-pro-pohon-vario_92380000?q=Pohon
There is Polini belt for vario…[Lees meer]

Hello
I made test with different start shoes over the weekend.
It is all about rubber compound. New shoes with softer rubber are slipping on clutch in my case, although they should provide better grip and eliminate slipping. I had best results with pair of old original start shoes with very hard rubber compound. I have almost non slipping on…[Lees meer]

Yes Wim, pullstart can be solution 😀
But I need to keep functional bycicle mode. I think pullstart gets in the way of crankarms.

Hello Herr Flick
Thank you for reading my post. Yes, I tried it also without these small spring. It is little bit better but still not enough to spin engine continuously. Clutch still work very nice only when decompression valve is open.
I tryied also another new pair of start shoes (Ferodo this time), still the same.
Yes, I also think better…[Lees meer]

Ahoj Wime
Ano, toto je můj set.
Motor běží, už jsem ho nastartoval pomocí vrtačky na matici variátoru.
Mám problém se startovací spojkou, protože komprese způsobuje vysoký odpor startovací spojky.
Mohu roztočit motor kopnutím pedálu, když je dekompresní ventil otevřený. Ale ne, když je dekompresní ventil zavřený, startovací boty prokluzují.
…[Lees meer]

Hello Wim
Tested oposit ditection of start shoes and it is wrong. It works worse, there is absolutely no attempt of friction when turning the clutch.
Start shoes can move easily in clutch bell.
Do not know what can be wrong.

Yes, clutch turns clockwise.
OK, will test it with start shoes in oposit direction.
Thank you Wim

Yes, I think start shoes are in correct direction. Same direction like in service guide.