Ironhead Kiehin buttetfly tune

[hogmania]

on my 80 with a 34mm carb I'm running a 65 with a 165 main, tried a larger pilot jet and it was doing the same as yours is.

[Megadeth]

With the 65 pilot i had to turn mixture out all the way.

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[jhaines]

Originally Posted by Megadeth

With the 65 pilot i had to turn mixture out all the way.

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I've got a 75 in mine. With that I set my pilot screw at between 3/4 and 7/8. If you turn it more than a full turn out you need a bigger slow jet. 75 is what works in mine.

[Megadeth]

I put a 75 in last night and mix was 2 1/4 out. Thats why i went with 80 sounded good at 3/4 out. But think i cooked plugs. When i get home from work going to slap in new plugs and hop on and see what hsppens. Cant believe how hard this has been to jet., what main are running?

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[jhaines]

165 in the main

[IronMick]

Originally Posted by Megadeth

I put a 75 in last night and mix was 2 1/4 out. ...

If that is a 34mm Keihin carb then something is wrong, or your pilot setting technique is incorrect. Have you dismantled/cleaned/inspected the carb? Post some pics of the carb [top, front, sides] so we can verify what it is. Measure the venturi at its most narrow point - cut two pieces of cereal box cardboard one 34mm the other 38mm and see which fits best.

Note that you cannot set the pilot screw by running the bike in a shop. You really do have to run it out on a quiet hiway for at least 20 minutes, then set it while the engine is fully warmed up. I set it approximately in the shop then do a final setting at the side of the road.

[Megadeth]

It might be how i a doing it.what size pilot and main should i be using with drag pipes and high flow a/c. I cleaned carb and did rebuild kit. It is a 34mm checked it last night. Had stock jets when i got it and mixture turned almost all the way out. This is driving me crazy. Got a big ride coming up would love to have it ready to ride.. Thanks everyone for all your help

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[Megadeth]

I did try and do it in shop . Took it for short ride to warm up then back in garage to adjust

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[IronMick]

Stock jets for 1981 are main 160, slow 68. I would guess that main 170; and slow 75, maybe 80.

[Megadeth]

Got 170 main 80 slow now. When you say you tune it on road do you just pull over adjust mixture and idle. Then ride a little more till right?

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