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  1. #1 Wanting Zongshen 250cc engine service manual or how to set up timing would help. 
    C-Moto Noob cal's Avatar
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    Needing Zongshen 250cc engine timing help and/or page(s) from service manual . My single cyl, air cooled, 4 stoke, factory case stamped ZS169FMM, * 89700102*, installed in a 2009 giovanni X-31 dirt bike. I was not as careful as I should have been when disassembling, now in need of help please. 1st issue -The upper timing chain gear can be bolted to camshaft in two different spots (180 degrees apart). Camshaft mount has two threaded hloes and gear has two drilled holes , holes are not off-set and unfortunately there is no master spine/keyway or the like to make its mounting idiot proof ) and I'm not 100% that I have the mounting to the camshaft correct (50/50 chance). On the outward face of this gear there are two stamped in lines radiating outward from gear's center, 180 degrees apart. Also stamp on same face is a Z and about 180 degrees from it is FL. Once I find out how to properly mount the gear to the cam here is my next problem - I assume one of these marks/identifiers(the F or Z or the lines) is to aid in valve timing set-up but i don't know which mark to use and also what it is to line-up to/with. ALSO -on the lower end timing scene - there is an F then T (about a 1/2 inch apart) stamped in the metal Drum part (can't remember proper part nomenclature) that spins, has magneto magnet mounted to it and surrounds the charge winding. This Drum has a bolt connecting it to the crankshaft, anyway, on the Drums cover there is an access hole to get on this bolt to spin the crank and also a smaller inspection hole above it with a slight notch in the top of the small inspection hole. The engine is at TDC when the T on the drum part is lined up with the notch in small access hole. I would greatly appreciate any help in properly timing this engine. I'm a 55 year old heavy duty mechanic, new to computers so hopefully if I figure out hope to post this message that I'll also figure out how to access any replies made to it . Feel free to give me any guidance on that issue also. Peace-out and Thanks
    Last edited by cal; 12-04-2014 at 05:19 AM. Reason: clearer description
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  2. #2 Re: Wanting Zongshen 250cc engine service manual or how to set up timing would help. 
    Senior C-Moto Guru humanbeing's Avatar
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    http://www.dongya.cn/prodlist.asp?page=8&tp=4&keywords=
    The rings are [1.2/1.2/2.5]
    ---
    NOT much difference btw those Honda. http://www.chinariders.net/showpost....5&postcount=14
    The parts http://cqgty.taobao.com/category-646...%D7%BE%B669#bd
    Weldangrind from chinariders.net is the Canadian expert about this "buy from birthplace via agent" option .
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