I need some info on why my one cylinder is smoking so much.

I've got the Mc16 and the bottom cylinder is smoking way to much. I can't seem to find the problem.

I just set my carbs right (float level and airscrew), but it still smokes like hell. The other cylinder is perfectly well. When I stop after driving and then leave the bike standing, maby to the following day, then I get a little bit of petrol leaking from that canister.

Can it be that my rings on that piston is maby finished. Or maby to much 2stroke oil with my pre-mix. Will it help if I take of the whole pipe and clean it. It really looks like that cylinder is getting to much petrol.

Please help

Ive found my bottom cylinder always smokes alittle more than the top when I first start the bike. Ive always put this down to any oil thats in the crank case will run down into the cylinder. On first start up it will smoke untill this excess oil is burned off.

If it smokes all the time then we really need to know what pre mix you are running. HRC recomend 30:1.

I had a feeling your 16 was all stock though so are you sure your oil pump is adjusted right? Or are you pre mixing and using an oil pump?

If you are using an oil pump and its adjusted right then I would look at maybe doing a compression test and then have a look inside.
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If I have to take the carbs off once more...

Thanks for the reply

I'm premixing all the way. Are you talking about the 2stroke pump, because if you are, I did already took it of. I'm premixing about 25:1 at the moment. Think that's maby a reason.

It looks more like a petrol smoke to me than an oil smoke. May be wrong? What do you think?

Or it can be that the pipe is just SO dirty inside. Don't know

So, are you premixing it with the stock jetting?

If your mixing 25:1 yeah im not suprised its smoking.

Can you list all the spec of your bike so we can see whats going on. Why did you take the oil pump off in the first place?
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If I have to take the carbs off once more...

Yes I'm running stock jets on my bike. Everything on the bike is actually stock standard. I bought it second hand from n other guy. I don't thing there is any performance parts to the bike. Just a plain Mc16.

I took of the 2stroke pump, because I don't want to take the risk that the pump may brake or anything like that and then I to ceaze the motor. You rather advise me to pre-mix 30:1.

Thanks

If youre running premix with the stock jetting you could really do with having a look at the jetting.

As the jets are now having to flow oil and fuel mix instead of just fuel they are effectively smaller. So really you need to be jetting up to give the engine the same amount of fuel as stock.
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If I have to take the carbs off once more...

Will you be able to tell me to what size I must change my jets Or is that a bit difficult to tell.

Do you think that my ratio may also be an problem

I would be dropping the ratio. I was running 30:1 on mine and couldnt get it clean so i ended up running 33:1.

Just guessing but if youre running the stock jetting to 110m/j each side i would be thinking about raising that to 112 or 114. That just my guess mind. Its gotta be safer than the stock 110 with premix though. I might even try going up a size on pilot, but its so hard to tell without hearing/seeing/riding the bike.
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If I have to take the carbs off once more...

Thanks for all the help I'll defnitily drop my ratio and have a look at the jets I'll keep in touch if there's more problems

Thanks alot

xXx wrote:
I'll defnitily drop my ratio and have a look at the jets...

I think Stephen is saying do one or the other. If you continue to use 25:1, then increase the mains a couple of sizes to compensate for the fact both petrol (gas) AND oil are passing through the jets. Same goes for the slow (pilot) jets. Increasing them from a #38 to a #40 may help.

If you adjust the premix to a more suitable ratio like HRC's recommended 30:1 or maybe down to 33:1 as Stephen suggests, then a main jet increase of maybe just 1 size (i.e. 112) may be enough, and you probably won't even need to touch the slow jets as Honda generally jet a little rich anyway.

Make sure you are using the highest quality fully synthetic 2-stroke oil you can lay your hands on too, as that will most likely burn cleaner and therefore could smoke less.
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Andy.
NSR-WORLD.COM

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Thanx alot fot that info Andy