Unfortunately there's no workshop manual available to the public for these bikes and I doubt the manufacturers have even bothered to translate one from Chinese.
I was thinking of doing the hard yards and writing one myself - but they change the engine types all the time and anything I wrote would be obsolete by the time it was finished.
In respect to your timing issues, the thing to realise is that the high performance versions of this engine have been extensively modified.
First of all, the cylinders are bored out to a larger capacity and a light weight ceramic coated piston replaces the stock unit.
A custom head and porting job then raises the compression ratio to around 12:1.
The valve & cam set is then changed to either stage l, ll or lll - depending on how hot you want the engine to run (and of course the timing consequently alters with the cam set). Other features such as light-weight flywheels, stroker cranks, stainless valves and beefed up clutch components are also added.
A stage lll race engine is right up there with a Jap competition motor and is scary fast!
So I guess what I'm saying is that these components don't work in isolation - they have to be put together to create the desired type of racing engine you want.
Seeing that the Bataycan engines from Saturday Night Cycles, only cost around a $1000 for the top end Stage lll racing engine,- it would be a lot cheaper to buy the finished article, rather than doing an upgrade yourself.
If you decide to get one, you might also look at fitting a 34mm Mikuni carb, which would really take advantage of the bigger engine and pump you out some serious horsepower!
I am South African and have information on the Puzey MX bikes that you may find useful. The XTR is dezigned by Mike Puzey an exceptionally talented engineer whom has over 20 international patents and has been engineering motorised equipment from a young age.
The Puzey XTR 250 f1 (the version currently available)
it has a 250cc Loncin motor, 2valves, aircooled. This produces around 17hp which a rather average but has proven to be adequate for trail biking. However a new version the XTR 2f is being released near October which will be far more capable with a 250cc 4-stroke motor with 26hp and a chassis similar to that of the crf450x.
The new bike sounds quite promising and so is the whole range of MX bikes, but they are produced in China so the thaught of poor reliable is indeed provoked. Anyway just chck it out it seems to be quite a good buy, I have ordered the MX version of the XTR 2f myself.
I really only use the bike for a bit of trail type riding.
I am 36 and 80kgs so it doesnt really have to work all that hard :-)
I have no intention of being the next Chad Reed. lol
So a full race spec engine wasnt really my intention.
I was just aiming to get this engine purring.
The bike runs fine just pops a bit up top at full throttle (was thinking the rev limited cdi might be the issue) It could also be a burnt valve. Will order a head gasket from Elstars and take a look. (any suggestions on torque settings for the head bolts ??)
I have been through and cleaned the carby and adjusted the jet needle and modified the air cleaner as suggested.
A mate of mine has a 140cc lifan powered pit bike which was running quite well but he bought and fitted a similar "Performance CDI" He did have to adjust the carby to run a little richer but the bike has gained a noticable amount of power.
I had thought that it may be possible to adjust the timing of the "Spark" slightly (like turning the distributor in a car) not the valve timing as I can imagine that would only be possible via the cam.
As for the manual,
I rang Elstars and they assured me that there will be a PDF up online in the next few weeks which should be an assembly manual for the Zongshen engine. I can only hope :-) It seems as though China is afraid that someone may copy their copy of an engine. LOL
If the CDI is just putting out a stronger pulse, then a little custom tuning might do the trick - but if the timing of the spark is advanced, it wont suit your bike in the standard configuration (as mentioned before).
The trouble with the Chinese add-on parts is that they don't really explain what you're getting and there's little in the way of installation guides and product specs to help.
That's why I tend to be conservative and go for things I know will improve performance without altering the set-up of the engine. A typical example of this is opening up the snorkel port on the air-box to free up air flow. This type of mod makes a noticable difference, but doesn't require re-jetting or any other messing about.
Another thing you can always do, is take the bike in for a tune-up at a specialist, who has all the right analysis kit (or even a dyno-tune set-up). It doesn't cost that much and will gernerally get you an extra horse or two.
If my bike keeps going O.K, I'm looking to get a bataycan stage 3 race engine next year. That way, the mod company will have done all the hard work for me and custom matched the upgrade components for optimum performance.
Went for a ride today the bike went great and i had no major problems except for one little problem one of the foot pegs like moved downwards so it was like nearly verical just wondering if you know how to fix it. Im not very good with motorbikes.
Went for a ride today the bike went great and i had no major problems except for one little problem one of the foot pegs like moved downwards so it was like nearly verical just wondering if you know how to fix it. Im not very good with motorbikes.
Hi Johny,
If you hit something big-time and bent your footrest, you will need to get some heat on it to straighten it out. Just banging it with a hammer will weaken the peg/bracket.
If the peg bent just going over a jump or something and just had you're weight on it - you need to find a better quality replacement foot-peg big time.
There are plenty of after market pegs available on e-bay - you just need to drop them a line and ask if the pegs advertized fit your bike.
Busted pegs are scary - err on the side of caution!
The footpeg is supposed to move upwards in case of impact and the spring is supposed to return it to the normal (horizontal) position. If your footpeg points down, then the locking tab has probably broken off and you'll have to replace the peg.
You should be able to source a replacement from where you purchased the bike - or from an after-market seller on e-bay.
Linear Mode
