to zongshen or not to zongshen!!


I am not sure if your stock pipe will work or not. I believe the 125 has a longer cylinder and the rear mount may require modification.

I went with a R&L Racing pipe from Jack at dratv. Very nice pipe and quiet with the insert installed. Without the insert, pretty loud. Good luck with your project.
OEM pipe will fit, but it will restrict performance. You will have to widen the rear mounting hole to get it to line up. Use a honda exhaust donut gasket 18291-H82-900


Well-Known Member
Problem...I did not receive a wiring diagram from the guy I bought the engine from!! I have tried to get one from him, but he doesn't respond.

That's the tradeoff. You're buying on price but you're on your own once the motor arrives. Dratv is probably the best source for sorting through the wiring, though the wiring adaptors they sell seem kinda pricey. Still, you have to give Jack his props for being the only vendor out there who posts schematics.

Wiring diagrams and other key information should be posted in FAQ for everyone's benefit

There are any number of exhaust options. How much do you want to spend? At the low end, $150-200 can buy a pipe with decent flow. At the high end $400-600+ buys some really trick exhausts made from stainless/aluminum/titanium. A stock CT70 pipe will be too restrictive, the PRC pipes are worse (1/2" outlet) and will choke your motor. Decibels and flow exist at opposite ends of the scale. You won't find a free-flowing exhaust that's as quiet as stock, but that's not a bad thing.The quiet pipes are restictive and sound like a wet fart, the free-flowing pipes tend to be very loud. Every pipe will be a compromise. The Gianelli is a good value but is distinctly louder than stock. Kitaco makes the nicest looking CT70 pipe; the quiet version doesn't flow that well, the race version is loud; the baffle is easily modded. Both are expensive ($375). A stock pipe (Honda or JC) can be modified with some metal surgery and welding. The baffle can be opened-up and a larger outlet installed and the head pipe can be carefully heated and bent to fit. The headpipe could also be cut and welded to fit, but the finished piece won't be as clean. I'm running this exhaust on one of my bikes and it's a good compromise, good flow/nice sound plus it looks almost dead stock. Another thing to consider is how hot the pipe gets. If you carry a passenger, then a smoking-hot muffler is unacceptable. The Gianelli fails this test. You also have to be careful with aftermarket pipes because they have no heat shield on the headpipe. Many pipes are not specifically made for the CT and either don't fit well or interfere with the buddy pegs. Only stock type exhausts have full heat shielding, the Kitaco muffler doesn't get much over 120F, but the headpipe stays hot for a long time :eek: There are also low-mount exhausts but these aren't much use offroad.
That is some sort of Chinese pipe, probably for a CRF-50/70 Knock-off bike. The mount looks like it is too far forward on the pipe, It does not look like the mount hole will line up perfectly on a CT frame without being modded or possibly the mount cut and re-welded. It will probably make more noise than power.
The Chinese pit-bike knock-off pipes I`m using are similar to that pipe in the headpipe area but the cannister style silencer is removable and the strap type mount is adjustable. The silencer does not silence much but there is a little heat shield. I made a mounting bracket and I can adjust the height of the pipe with it to keep the pipe away from burning my pants and leg and cooking the RR turnsignal. Passengers are not an option with my pipe. I also got burned pretty good by the heatshields on the stock pipes I`ve run so there really is no trade-off there.
I think the cannister type silencer on my china pipes hurts bottem end some but it does flow really well at maximum rpm. The noise is excessive and annoying, especially in a residential area.
I am planning on trying to adapt an Big Gun atv silencer I have to one extra pipe I have when I get some time.
I have a modified stock XR/CRF 70 pipe that i took out the stock endcap and installed an open one with a screen style spark arrestor. Not very loud but i have not had a chance to ride and evaluate it.


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TrailPunisher said:
The Zongshen engines cases are wider than most other engines, The dipstick is mounted higher on these engines due to the wide cases. I had to grind away some metal on the stoplight switch mount and remove the chrome beauty cap on the oil dipstick to be able to get it in and out. Its tight but i can get it in and out.
Pic of my modification


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hmmm i guess ill just put the factory quiet pipe on for the shwp decible test and switch to a louder pipe once i get the plates!


New Member
Zongshen motors

I was selling Kazuma quads for a little over a year, they had Zongshen motors on them. I never had one break under warranty. And believe me my kids beat them hard. The only trouble was the fuel lines and any rubber parts were junk. They would crack and leak bad. I just replaced the lines before they were even sold.


Well-Known Member
The real Zongshen motors that hit the market maybe five years ago were decent, depending upon the exact model. Some models had their problems, mostly electrical and shifting issues and these could be corrected, for the most part. Some models actually came with Japanese bearings in them. These also cost more than the ultra-cheap stuff currently on ebay. The Z108 is the only unit that's been around long enough to have a record of field service. The Achilles heel of these engines is the gearbox. They're known for wearing out the third gear cluster and for having soft shift forks (virtually all PRC motors have these issues, particularly the soft shift forks). Unlike nearly every other PRC motor, parts can actually be had for these. For non-race use, it is possible to get decent service life out of one. That's where the good news ends.

Trying to find a genuine, high-spec, Z108, preferably the secondary clutch model, has gotten very difficult. PRC bike parts are built to different cost/quality specs, levels 1-5. Quality costs more to produce. With the Waldomart marketing mentality that's taken over, there's mostly engineered-to-sell lookalike product available lately. Even dratv gave up trying to sell the Z108. At $700, a proven motor sold on quality doesn't look as good as a prettied-up $265 125cc motor sold on price. Pick your brand, it can say anything on the cases. Copyright enforcement doesn't exist in PRC. Three guesses which wins in mass merchandizing, quality or price? And that's the issue, you have no idea what's being offered for less than $300. There are so many variations, cobbled together from odd-lot parts, many of which failed Q/C, that it's a total crapshoot. Setting aside consideration of quality issues, finding parts is a nightmare. Even the hardcore devotees who want to fit aftermarket cams, heads, bore-up kits run into major headaches trying to figure out what parts to buy. The aftermarket vendors don't have it any better trying to navigate through an ever expanding blind maze of motors.

If you want something beyond a dixie-cup, use-it-and-toss-it engine, ask the seller for a parts list and try to order some small replacement pieces before you buy that engine. A solid dealer, selling a legit zonger will be able to provide product support (setup, wiring & repair information) and supply you with replacement parts. The market has undergone a rapid and dramatic shift over the last year. The one constant is that if it seems too good to be true, it probably is. It's not that acceptable product doesn't exist. At issue is how, exactly, one goes about finding it. :confused:


I think i'll bring this back to life just because the advice, tips and reviews in this thread helped me out ALOT with the zongshen im about to purchase, 108cc


New Member
Well I have a 1972 CT70 and I'm thinking about getting one of these engines, and after reading a few threads I'm sayin to heck with it because there seems to be a lot of confusion, a lot of different manufacturers/assemblers/sellers and I dunno if the bike would be worth my time at this point


New Member
From what I have heard, I agree with Trailryder. I have a Lifan 110 in my CT and have nothing but good things to say at this point.

BTW - I have an extra Lifan 110, new in the box, if you are interested. Check the for sale section. Good luck with your decision.

I need that motor how much