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If during the course of normal operation you are blistering paint on the oil tank or elsewhere, it is running too damn hot and the tune is suspectl And, the statement that big engines run hot is really not true. I am running a 120" build and it routinely runs in the 185 - 210 range depending on abient temps and even at full tilt cruise (80mph two up loaded with wife and touring gear) in 90+ temps, it runs about 215 - 225 degrees.
I get so tired of hearing big engines run hot, big engines don't get good fuel mileage, big engines are not reliable, all a load of crap in my opinion. I have 35k miles on the build, have run it all over the country in all temps and at all elevations and it is bulletproof, gets 42 -44mpg, have seen 50+ mpg at higher elevations and runnning 87 octane.
If it is as hot as you say, the tune or build is bad, or it is a full on race engine you should not be trying to ride on the street.
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__________________ 07 120" Hotrod Bagger
HeadQuarters Top End, Darkhorse Crank, Primo Pro Clutch,D&D Borzilla
TP Rocker Boxes, HPI 55mm TB, TTS , Baker DD7 Built by owner 125Hp/145Tq SAE Corrected
Renegade Wheels, Paint by Attitude Custom Painting
This is exactly my experience also. If the heads have no quench area, the squish is not tight, and the exhaust to intake flow ratio is wacky with poor port scavanging the engine will super heat.
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01 Dyna, R&R Stage 4 head work, 98" domed CP pistons, RR615 cam, Bassani Road Rage exhaust, R&R Big Air carb, R&R ignition
SAE 116T, 116H
Now have 16K plus on 113" El Bruto, nothing but fun. As I mentioned in first post had rocker arm break in first 1k. Company replaced both rockers, pushrods, lifters and boxes, haven't looked back since. Did 2.5k from NM to Sturgis, no problem and blew out dyno drags at the Full Throttle Saloon. Love the power and price.
