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Further to this. I had a look at the Lifan downloads on the DHZ site and it seems you are missing the whole tensioner assembly. Dunno what that spring is actually for?

I don't know anything about this engine but do know that the way you have it now the spring is not exerting much pressure on the tensioner arm. The spring should be mostly compressed unless the chain is completely worn out and I am guessing there is some other part missing that captures the base...

I don't know anything about this engine but do know that the way you have it now the spring is not exerting much pressure on the tensioner arm. The spring should be mostly compressed unless the chain is completely worn out and I am guessing there is some other part missing that captures the base...

Hi, Attached is a photo of the brass spigot on the outlet side of the carb left of the choke. Hope this helps. Cheers Garry

Hi, I have a 28mm OKO carb. It does not have a power jet on the inlet side of the carb but for some reason it has a brass spigot mounted on top of the rear portion of the carb outlet that faces the head adjacent to the choke. This brass spigot goes through to a small jet on the outlet side of...

Yeah PE28 mate. Typo? Now on 20 main jet and still seems too rich. Plenty of get up and go from idle to 3/4 throttle but not much after that. Bike gets to easily and cruises at 100 to 110 kph (60 - 65mph) uphill or down hill but not much left after that. My Z140 in a postie is slightly quicker...

Got onto the main jet today (Z190) and a bit disappointed. Running a 125 main and seems to be too rich. Transitions and runs cleanly right up to 3/4 throttle and then nothing much more. Misses and produces little extra. Dropped back to a 120 main but have not yet had a chance to test. Runs much...

Hopefully some pictures posted - 1969 Honda S90 with Z190 engine

I will take some pictures tomorrow and attempt to post them. It actually doesn't look much different from the original with the small oil cooler and the positioning of the carb being the only give aways to someone who knows what they are looking at.

Update on the Zongshen 190 Honda S90 build. Starts easily hot or cold on the electric but almost impossible to kick start cold. Motor is very tight with only 200km - usual vibration from a tight engine but expect this to disappear as it did with with my Z140 postie bike build. Clutch adjustment...

I have just fitted the Zongshen 190cc engine to a 1969 Honda S90. It has a Pro Circuit copy exhaust system from DHZ and a genuine Keihin PE28 with 40 slow and 125 main Jets. Early days yet as it has only covered 100km since the build but it runs strongly and smoothly and the gearbox is light and...

Thanks All for the advice. The problem is now solved. The throttle cable was sticking at the throttle (handlebar) end. That was fixed easily. The new air filter appeared to have been oiled but on closer inspection it was not. I oiled it and now the engine runs well and idles properly with a 36...

Thanks for the info.

I have a Zongschen 140 and am thinking of fitting an inductive tachometer. What I need to know is if the spark plug fires every second revolution of the crankshaft as is normal on a four stroke or if it actually fires every revolution of the crankshaft meaning there is a wasted spark. Any...

Yes well starting to get somewhere. Found that the throttle was intermittently binding in its handlebar mount. Pulled it apart, removed all the grime and it is now completely free. Problem one solved. Went back to a 100 main and 42 slow and it now idles well hot, transitions well and pulls hard...

Yes running an oiled oil filter. Have also sealed the cable entry points to the carb. Have dropped the idle jet back to 45 and the air screw is now one and one half turns out. Idles well and transitions well. I have checked all points of leakage on the intake manifold at both the carb and the...

Idle jet is now 50 with a 104 main and the motor is running well right through the range now and idles well. I suspect there is still a little to be gained at the top end so might try a 106 main.

Thanks for,the advice. The throttle doesn't stick and has the correct travel. What happens is I get the motor to run at an erratic but reliable idle speed but after a run it is almost as if the throttle is stuck at 1/2. After cooling down it is good again. The air screw is only 1/2 a turn out...

Anything under 36 and it won't start at all. It just kicks back

Hi All, I have an OKO 26 on a Zonschen 140cc it has a 36 pilot and a 100 main as supplied. It runs well right through the rev range but seems impossible to get to idle properly. Regardless of the pilot jet fitted (have tried everything from 36 through to 48). I get it to idle properly then...