Lean condition??
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3rd Gear
Joined: Sep 2013
Posts: 7
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From: Ontario
Lean condition??
Got a stock evo with a Super E shorty.
At partial throttle I can hear a slight detonation. At full throttle it's quiet and pulls good. idles good. If I retard the timing anymore the bike runs like crap. The plugs are a light tan colour. I suspect that it's running too small of a intermediate jet??
I've read that a stock Evo should have a .295 intermediate jet which is the smallest jet?
Any thoughts?
At partial throttle I can hear a slight detonation. At full throttle it's quiet and pulls good. idles good. If I retard the timing anymore the bike runs like crap. The plugs are a light tan colour. I suspect that it's running too small of a intermediate jet??
I've read that a stock Evo should have a .295 intermediate jet which is the smallest jet?
Any thoughts?
Dirt don't hurt
Joined: Jan 2011
Posts: 21,062
Likes: 4,547
From: Haslet Texas
It sounds like you have a pre 2004 carb.
Ask Dr Hess what jets he uses in his.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,062
Likes: 4,547
From: Haslet Texas
By the way I am basing that on the small main jet you have.
I'm running a .0295 intermediate with a .072 main.
I have tried all kinds of other jet configurations but came back to that one as it just runs the best there.
I'm running a .0295 intermediate with a .072 main.
I have tried all kinds of other jet configurations but came back to that one as it just runs the best there.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,195
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From: NW AR
Detonation is usually timing related, not so much fuel mapping. It can be, but usually not at part throttle conditions in my experience. Sometimes at WOT, maybe.
I'd check the timing first. Set the timing by a timing light per the book and check the VOES switch like Tom says. If all that is OK, then start messing with the jets.
I'm running a 265 intermediate and a 64 main, and yeah, I guess I have a "pre-2004" Super E.
I'd check the timing first. Set the timing by a timing light per the book and check the VOES switch like Tom says. If all that is OK, then start messing with the jets.
I'm running a 265 intermediate and a 64 main, and yeah, I guess I have a "pre-2004" Super E.
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3rd Gear
Joined: Sep 2013
Posts: 7
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From: Ontario
Everything I've read says about a 295 intermediate and a 70 main.
Since I replace the jet to a 33, throttle response seems crisper. Go figure!?
.066 main seems to work too.
The bike is a 72 FLH with a 87 evo running points. (I like points)
If I really retard the timing the "pinging" almost goes away but performance goes down the tubes. If I advance the timing, the motor pulls good but then I hear that friggen rattle.
Whether the motor is totally stock or not I'm not sure.
I bought the motor 5,000 miles ago used, to replace a broken shovel.
Since I replace the jet to a 33, throttle response seems crisper. Go figure!?
.066 main seems to work too.
The bike is a 72 FLH with a 87 evo running points. (I like points)
If I really retard the timing the "pinging" almost goes away but performance goes down the tubes. If I advance the timing, the motor pulls good but then I hear that friggen rattle.
Whether the motor is totally stock or not I'm not sure.
I bought the motor 5,000 miles ago used, to replace a broken shovel.
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Road Master
Joined: Oct 2011
Posts: 957
Likes: 2
From: Carlsbad Springs Ontario
Detonation ?
Detonation is usually timing related, not so much fuel mapping. It can be, but usually not at part throttle conditions in my experience. Sometimes at WOT, maybe.
I'd check the timing first. Set the timing by a timing light per the book and check the VOES switch like Tom says. If all that is OK, then start messing with the jets.
I'm running a 265 intermediate and a 64 main, and yeah, I guess I have a "pre-2004" Super E.
I'd check the timing first. Set the timing by a timing light per the book and check the VOES switch like Tom says. If all that is OK, then start messing with the jets.
I'm running a 265 intermediate and a 64 main, and yeah, I guess I have a "pre-2004" Super E.
On older sleds like yours i suggest you do a wire " pull test " as descibed above on the harness located between the main frame and front end that pivots as you steer . In many cases this old stressed wiring has only one or two strands of wire left unbroken inside the plastic covering and a good pull on each wire will show each weak spot by the plastic stretching out of shape .
Older bikes Rule but older wiring can cause you headaches galore unless you ensure the wiring is ok beforehand !!!
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