Hi all,

Having completed a bottom and top end rebuild, I found my bike was smoking considerably more upon start up than it did before the rebuild. Much less smoke once warmed up.

I’ve adjusted the oil pump ( thanks Andy) so that at WOT, the line on the middle of the pulley meets the marker on the pump body. No marks on my carburettor slides for 50% throttle.

Upon removing my carburettor twice, I found about a small teaspoon of oil in the bottom of both reed cages.

Is this amount of oil normal?

My air filter is OEM and seems somewhat oily?

Any info appreciated.

It's a tricky one to comment too much on, and I will never comment, or allow comment on anything other than standard setup for reasons I've gone over a number of times. It's something you really need to make your own informed decision on, or entrust to a 2-stroke specialist if you're uncomfortable with fiddling. However, in my personal opinion, there's a large [safe] margin for error in the standard setup to cover a wide range of [Japanese domestic] fuels and operating conditions.

Manufacturer's standard settings are always going to be rich. That means for a 2-stroke the standard oil pump is going to over-oil to some degree, and the jetting/needle is going to be rich... it would be financial suicide to release a 2-stroke with edgy/lean settings.

It's common for the filter to be quite wet and oily, as there's always a lot of "stand off" from the carbs. It's also common to see a little oily residue in around the reeds, but there shouldn't really be much more than just a misting.

Sorry to be so vague, but make of that what you will. Remember though, any deviation from the OEM settings is on your own head!
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Andy.
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Also worth mentioning that during reuild you probably used 2T oil to assemble? This may take a little time to clear.
Have you had the engine up to full temp yet?

Hi Max,

Yes the engine has reached full temp several times and I carried out the various heat cycles as per the full engine rebuild section.

I have come down two sizes on the mains and still quite a bit of smoke upon start up. Using rock oil synthesis fully synthetic injector oil.

I guess I’ll just have to do some more mileage and see how things go.

In that case have you tried a plug chop under load to assess the fueling? It is a bit of a faff to do but it is the best way to see how the engine is burning.

Might be worth posting a video of the exhausts running as well? before and after warm.
Your idea of smokiness could differ from mine for example...in the end I would always point you back towards performing a plug chop though, it is the only safe way to know you are running the bike rich enough.

Good luck