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I keep the rpms up pretty good. I don't have a spedo or tach but I definitely don't lug it. It doesn't ping on my regular rides around town even when I get on it pretty good just on the fwy in 5th. I don't worry about it much. The engine pinged before the rebuild and the pistons looked fine when I replaced them and it's extremely rare that I go WOT in 5th.
Whats done to the engine performance wise? What ignition and carb?
2003 1200 with ported polished heads, larger valves, Carillo pistons, ported intake, andrews N2 cams, S&S lifters and rocker boxes. The carb is the stock carb with the CV performance kit and dynojet slide. The ignition is a Dynatec 2000i with twin fire II coil in single fire mode set to the least aggressive advance curve. The exhaust is a supertrap 2 into 1 with 10 disks. Everything has less than 1000 miles on it. Carb has a 45 pilot and a 80 main with CV perormance needle. Compression is at 9.5:1. I had an 85 main in there and it didn't ping but there was a terrible hesitation at wide open throttle. Went up to a 90 main and it got worse so it was running rich. So I think the jetting is right. It also has a new Voes which has not been altered, yet.
Last edited by OCSpringer; May 6, 2023 at 01:09 PM.
Interesting, I'm running a 190/45 with same needle and my plugs look perfect and superb performance, dead smooth idle. That's just the basic 1250 upgrade with Dyna2000i. I'm kind of surprised you're running a 180 main with all your mods. Seems like it would want a richer blend, but I don't profess to be an expert. You are just up the coast from me, so same altitude and climate.
I started with a 185 and the plugs looked lean, went to 190 and they look picture perfect, just like those charts you see.
John
Last edited by John Harper; May 6, 2023 at 01:38 PM.
Not so much in the States as opposed to California. Highest octane we can get is 91. I feel like my bike would love 93 octane.
Yes, and we have something like 15% ethanol in CA? We also switch gas blends for summer and winter. And, the oil companies use every excuse imaginable to keep our prices about $1 gallon above everyone else. If a butterlfy farts in Botswana, gas goes up 50 cents a gallon in California.
What about buying racing gas? I think it's sold in 5 gallon cans? Probably expensive, but maybe worth a try, at least once. A present to yourself? https://vpracingfuels.com/product/c10/?c=500
John
Last edited by John Harper; May 6, 2023 at 01:50 PM.
Interesting, I'm running a 190/45 with same needle and my plugs look perfect and superb performance, dead smooth idle. That's just the basic 1250 upgrade with Dyna2000i. I'm kind of surprised you're running a 180 main with all your mods. Seems like it would want a richer blend, but I don't profess to be an expert. You are just up the coast from me, so same altitude and climate.
I started with a 185 and the plugs looked lean, went to 190 and they look picture perfect, just like those charts you see.
John
This comment made me remember that I am running all 10 disks in my exhaust. I am going to start removing disks and see if I can tune the ping out on the exhaust end. The more disks the more airflow so 180 is too lean and 185 is too rich I can see if removing some disks richens it up enough.
Maybe tomorrow I will give that a shot. On my way up to the flat track races in Ventura tonight.
I'm kind of surprised you're running a 180 main with all your mods.
The new engine is basically an overbuilt stock engine. I am still using the stock carb and running a restrictive exhaust. With how easy it is to change the top end I figured I would use the 1200 cylinders I had but build everything else up knowing a 1275 kit and bigger cams are down the road eventually.
Chart just for reference, as this forum is very international.
So, 125cc bike ran 92th petrol without any issues, sometimes I was feeding it with 95th.
Now 1200cc EFI Sportster eats 98th, so 95 is also acceptable.
Never ever I had to put any additions into fuel, except 2T oil when I rode a two-smoker.
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