Generac 990twin

[Revx500ss]

Best ideas to tune and set up Generac 990 twin with the mikuni carb also jet and needle size.. and any pics of intakes with the carb set up would be cool sorry if I post this in the wrong spot. I'm new to the site..

[Skoal82]

Search for smokingdog on the forum
He has some info on them I think

[smokindawg]

I have everything but the clutch to set one of these up. But do need to change out the tapered crank for a straight shaft. I have the engine, carb, all the intake adapters and stuff to build a cold air induction. I'll have to search but there have been a couple people build carts using this engine.

I don't have any pictures of one set up though.

Read thru this thread!

And this thread!

I have all the parts from the first one and the second one was a cart the guy finished and is running.

[Revx500ss]

mines going in a pulling tractor only few guys have used the generac I'm a tech for generac.

[Revx500ss]

what did you fellas use for jets and needles

[smokindawg]

If you read thru those two threads you'll find info and pictures of what your looking for.

But here is a quote about the jets: "If I was leaving the engine stock that I needed a 160 main jet a .25 pilot jet and a 2.3 needle and seat.

[smokindawg]

The first page of the first link has pictures of the intake, carb and carb adapter.

[smokindawg]

I have everything to get mine running except the straight shaft crank. Mine still has the tapered crank in it.

[Revx500ss]

smokin your a great help do you know the difference between the hrs and hsr carb ??

[smokindawg]

Originally Posted by Revx500ss

do you know the difference between the hrs and hsr carb ??

I really have no clue. I don't know anything about these carbs. I know I have one that's brand new but other than that, it's just a carb to me.

I've actually been thinking about selling all this stuff. Advertised it but no interest. I may just have to try a different venue!