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  1. #1 Sinnis Max 2 (QM125-2V) Carb issues 
    C-Moto Noob
    Join Date
    Aug 2020
    Location
    United Kingdom
    Posts
    3
    Hi Folks.
    I'm new here. Hoping for a bit of advice from you all.
    I Have a 2015 Sinnis Max 2 that's randomly developed a carb problem.
    The bike is completely standard apart from the stupid SAI thing has been removed and the ports plugged up, and the exhaust is a GS125 pattern part.

    I bought it second hand and gave it a thorough service etc. It ran perfectly for a couple of hundred miles, now the revs have started hanging at around 4000.
    It starts fine, idles at around 1300, plug is a good colour if not slightly rich.
    Throttle cable is new and in good condition, no binding at all.
    Carb has been stripped and cleaned 4 times at this point. New o-rings fitted.
    Valve clearances are bang-on.
    It's a mikuni carb, one of those cheap single cable jobs. Jets are standard, 97.5 main and I think 15 idle but can't remember to be honest.

    I've checked for air leaks, all good there. I've tweaked the mixture screw, no joy there. It'currently set to about 1 3/4 turns out which feels about right. Any further out and it starts bogging when I blip the throttle.

    Any ideas,guys? It's my son's first bike and I need it to be safe for him.

    Cheers Folks,
    Thanks very much!
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  2. #2 Re: Sinnis Max 2 (QM125-2V) Carb issues 
    Senior C-Moto Guru humanbeing's Avatar
    Join Date
    Dec 2008
    Posts
    1,508
    BS26? Torn a hole in diaphragm isn't uncommon at all. Quick Chinese solution = Replace it w/ a Fakuni
    https://item.taobao.com/item.htm?id=616677907525
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  3. #3 Re: Sinnis Max 2 (QM125-2V) Carb issues 
    C-Moto Noob
    Join Date
    Aug 2020
    Location
    United Kingdom
    Posts
    3
    Hi Humanbeing.

    It's not a CV carb, it's a cable operated slide job. I stuck a new one on today but still no joy. As soon as I adjust the idle so that it doesn't stall, the revs start hanging at around 4000. Mixture screw doesn't seem to help much. Bearing in mind that the idle screw basically just alters the stop position of the slide, do you think changing the needle height will help? I'm just clutching at straws here ��. Is there anything simple I'm overlooking here? I'm certain it's not the cable.

    Cheers ��
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  4. #4 Re: Sinnis Max 2 (QM125-2V) Carb issues 
    C-Moto Noob
    Join Date
    Jan 2021
    Location
    United Kingdom
    Posts
    1
    Hi, did you manage to solve this?

    I’m having the exact same problem

    Cheers
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  5. #5 Re: Sinnis Max 2 (QM125-2V) Carb issues 
    C-Moto Noob
    Join Date
    Aug 2020
    Location
    United Kingdom
    Posts
    3
    Hi Mate,
    I managed to get it running adequately but it's not perfect. Revs still drop a bit slowly but don't hang anymore. I basically stripped and cleaned the carb again, tried a bunch of different jets but ended up going back to stock. Tried altering needle height but it just made it run like shit so put it back to stock. I cleaned all the mating surfaces, put new o rings and a smear of gasket goo and stuck it back together. I had a blanking plate over the ais port so I took that off, cleaned it all and replaced the gasket. After that I just pissed around with the mixture screw and adjusted the idle speed as I went along. It took ages. Start at around 1.5 turns out and adjust about 1/4 turn each time. Its a case of just getting it running the best you can and living with it, I reckon. Upgrading the carb is probably a really good idea, the stock one is pretty nasty. Best of luck!
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