OutdoorKing Repair Forum Forums Restoring, Customising and Modifying Tech Talk chonda ohv

Thanks for your patience Rob, as you know (but I had forgotten) I've already made that test myself with the the Ruixing one and the Keihin one, and got the same results as you did. So the Huayi idle jet is slightly smaller than the Ruixing, which in turn is a bit smaller than the Keihin. The Keihin is officially 0.38 mm, but for the others we don't have official figures and can only guess, since both of us only have jet drill bits in size intervals of 0.05 mm. With the idle jet it doesn't matter much because you can adjust the idle mixture screw to compensate. With the main jet you can't adjust anything to compensate, and the Ruixing one is approximately 0.60 mm in their GX120 version. In the Keihin, the main jet is 0.60 mm for the GXV120, and 0.55 mm for the GXV140. I haven't measured a GXV160 one. So, at this stage there is no great difference in the jetting for the GX120 versions of the Keihin (Honda) and Ruixing (chonda) carburetors. The Huayi, presumably another chonda, so far has a compatible idle jet, and we don't yet know about the main jet. So far, our starting-off guess that the chonda bits are mostly interchangeable with Honda bits, is standing up fairly well. However we do know there are bits that don't interchange - in particular, some flywheels. I'm pretty sure the ignition modules for chonda and Honda will usually interchange, at least on the GXV140 and GXV160, but I'm not so sure about the GXV120. I have a vague recollection that the GXV120 cylinder block does not have the dual set of ignition module mounting holes that the GXV140 and GXV160 have. Would you mind having a look on the genuine GXV120 you are working on, and see if it has the three module mounting holes, or only two? The two holes would fit an N type module, but you need the extra, offset hole to fit an A type module. I'd check it myself but I don't have a spare GXV120 block any more, having thrown out a couple of worn-out ones.

Ok I'll do this tmrw and put up a photo.

Grumpy, theres nothing wrong with your memory.The photos in order gxv120 without coil


Gxv140 without coil and without coil spacers ,and with coil spacers



Gxv140 with gxv140 and gxv160 coils and neither fit the gxv120 but the gxv120 fits the gxv140 and the 140 chonda and I don't know if that would work as you can see the rear right hole has not been tapped .



Chonda SL1P64F =(140) without a lot of stuff,



Chonda SL1P60P =(120) without coil which are (the coil) interchangeable with chonda (140) and visa versa, the chonda coil works perfectly on a honda gxv120.

A honda gxv160 without coil

Thorough as usual, Rob, and very clear pictures. So, if I'm interpreting correctly, the Type N module (standard on GXV120) will fit any Honda or chonda, but you have to tap the right hand hole to fit it to a GXV140. However the hole is already tapped on the GXV160. The Type A module (standard on GXV140 and GXV160) will fit any GXV140 or GXV160, but cannot be fitted to a GXV120. The chondas follow the same rules as the Hondas, for what will fit on each model.

Thanks for doing that - now the archives will show the differences and what to use where. The one question not answered yet, is whether the GXV120 module (i.e., the Type N) will work properly on a GXV140 or GXV160, and whether it would have to be fitted on the spacers, because of a difference in the flywheel?

There is probably a reason that Honda decided to fit only Capacitive Discharge Ignition (that is, Type A) modules to those larger engines, while continuing to fit the standard modules to the GXV120 (which was the first of the three models to be designed and produced). Conceivably the CDI module will work better than the standard one under some specific circumstances. Generally CDI works better than standard ignition if the spark plug is fouled, but works less well than standard ignition if the mixture is lean.

Iwill try the standard gxv120 module on the 160 tmrw,the armeture is the same thickness so I will use the spacers. The armeture on the standard 140 module is a fair bit thinner and so is the replacement 160 module but they still match in with the flywheel magnets and from what I can tell you would use the spacers on either 140/160 flywheel.

While you are doing that Rob, you might be able to clear up some flywheel-related questions.

1. There must be a reason for the GXV140 and GXV160 requiring spacers under the ignition module, where the GXV120 doesn't. Are the rims of the GXV140 & GXV160 flywheels deeper than the GXV120 flywheel? That might explain some problems a member had in another thread, with flywheels.

2. The GXV120 has a cast iron flywheel, where the GXV140 has an aluminium one. Is the GXV160 flywheel cast iron, or aluminium? If aluminium, is it the same as the GXV140 one? Are the magnets the same on all the flywheels - same number, in the same place?

3. Are the chonda flywheels the same as the Honda ones, for all three models? I'm not suggesting you pull the flywheels from these engines to find out, but hopefully you will be able to tell without doing that.

Ok the gxv120 module works perfectly on the gxv160 with the spacers. I will at the flywheel shortly and measure .

Chonda 120 flywheel diameter 170mm and 40 mm thick
Chonda140 :-) :-) as above
Honda. 120. :-) :-) 160mm. 40mm
Honda. 140. :-) :-) 170mm. 35mm
Honda. 160. :-) :-) 170mm. 40mm
All these measurements are approx. All measurements where taken from the magnets and not including the fins. The honda gxv140 measures 35mm where the magnets are and then reduces down to 30mm.
The first three on the list are cast iron gxv140,gxv160 alloy.

Thanks Rob. Those measurements don't seem to tell me why the GXV140 and GXV160 use spacers under the ignition module while the GXV120 does not. That is a mystery still to be solved. It also sounds as if a GXV140 or GXV160 aluminium flywheel might fit on a GXV120, in place of the cast iron one. I doubt it would kick back, because the GXV140 doesn't kick back. However the GXV120 has a plastic fan that sits on top of the cast iron flywheel, while the other two have an integral aluminium cooling fan, so there may be issues with the starter cup. Not something I'm going to try in the short term, because I don't have an aluminium Honda flywheel anyway.

Hi Grumpy, I will have to do some more on this later ,I guess at least we know the gxv120 module works good on the gxv160 really good actually. I have got a little behind, i have a 4hp mariner, 2 chonda water pumps 2 husqvarnas chainsaws,a genquip gi2000 and sanli to repair and service so I better get started . Thanks heaps Grumpy this is interesting and I think over time we will all benefit.

Thank you for making this thread happen, Rob. I'll leave it open, in the hope that more information will become available on chondas, and how they relate to the equivalent Hondas.

I think the magnet height may have something to do with it ,I matched the 120 module to the 160 with the spacers and without the spacers and the 120 still fitted well in the magnets unlike the 140 which in the photo (second from the end)shows very slim magnets, about half the height which explains the spacers for that one, and so maybe on the bigger blocks they lifted the module to keep it cooler and centred on the magnets but this is only an idea.
Good to keep this open and if I find something I will post it.

This thread has been inactive for 8 months, and another chonda thread has been opened recently, so I'll close this one.