loads of smoke?

[rd400canuck]

Just curious... is it normal for an RD400 to smoke like a chimney with premix at 32:1 ?

I have a 27.5 in there right now instead of the stock 25 pilot so maybe that's why?

Thank you,

John

[Greaser Greg]

No idea., but: When first running my R5 it  smoked a lot because I had kicked it a bunch before it fired and burned off the built-up unburned fuel. How long did you run it? Asfaik the requirement for oil at idle is pretty low, goes up with revs. That's why the pumps are desireable for idle speeds, ratio is something around 100:1.

[SUPERTUNE]

Why 32:1?
Way to much for a streetbike on modern oils.
No more than 40:1 in cold climates and 50:1 in higher climates like the south using high end ester based oils if not a track bike.

Chuck

[1976RD400C]

Not sure how much you have run it but it is going to belch out smoke the first time you run it up through the gears after starting it. Once the lower end blows clean it should get better.

[m in sc]

agreed. chuck politely gave me the same speech via msg a few weeks ago. of course, hes right. 40:1 = good. 32:1 is ok as well, but it will smoke more. (ive never had an issue).  But, that initial run will always bench out a cloud.

just make sure its not smoking -notably- MORE out of the RH pipe as that can be a sign of a bad crank seal.

[rd400canuck]

ok, thanks guys... I'll go to 40:1 since this bike isnt going to have the crap ring out of it; until I got the pump rebuilt and tested.

[paul1478]

I use 40:1 and my bike sees over 10K. When we took it apart piston and bore looked new.