Ironhead 1000
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Novice
Joined: Jun 2017
Posts: 19
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From: Independence, MO
Ironhead 1000
1975 Sportster 1000
I think it's kinda a fuel issue... It has a Keihin carb(butterfly type) But had 180 and 72 jets( accelerator pump was an 80)
I think that is WAY too big, leading me to think this carb was off a Big Twin... I had another trashed Keihin laying around... it had 160 and 68... i pulled those, cleaned them...
still getting a top end cut out...
What size jets should it have? I know Big twins ran like a 165 main... I think
I think it's kinda a fuel issue... It has a Keihin carb(butterfly type) But had 180 and 72 jets( accelerator pump was an 80)
I think that is WAY too big, leading me to think this carb was off a Big Twin... I had another trashed Keihin laying around... it had 160 and 68... i pulled those, cleaned them...
still getting a top end cut out...
What size jets should it have? I know Big twins ran like a 165 main... I think
Road Warrior
Joined: Nov 2006
Posts: 1,427
Likes: 763
From: Heart of Dixie
Its been a long time since I was into the carb on my '83, but I think the stock jets were a 160 and a 52. With a more open exhaust and air filter, I'm running a 165 and a 55 (to the best of my memory). If the idle mixture screw is still sealed from the factory, remove the plug and adjust it - the factory setting is really lean. I'd guess the stock carbs for the '83 and '84 models were pretty much the same.
Thread Starter
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Novice
Joined: Jun 2017
Posts: 19
Likes: 1
From: Independence, MO
Well when I installed the 160/68 combo it was pretty bad... lots of de-acceleration pop... not the sexy kind either... surging at lower throttle... it was without a doubt lean as **** 
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