Evolution "pinging"
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3rd Gear
Joined: Sep 2013
Posts: 7
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From: Ontario
Evolution "pinging"
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?
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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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Joined: Sep 2009
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From: deland,florida
first ide check for a intake leak,that would explain the better respose with the bigger int jet.but it sounds to me like you've got higher compression pistons with a stock (or close to stock) cam
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3rd Gear
Joined: Sep 2013
Posts: 7
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From: Ontario
I checked for leaks and found none.
I did find the exhaust shields were loose and the cover for the battery was rattling when I hit it. Stuck a chunk of rubber to isolate it. As soon as the rain lets up ill give it a go and see if that was the prob!
I'll let you know.
Thanks!
I did find the exhaust shields were loose and the cover for the battery was rattling when I hit it. Stuck a chunk of rubber to isolate it. As soon as the rain lets up ill give it a go and see if that was the prob!
I'll let you know.
Thanks!
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