Joe, is that on pavement? 'Cause it was 75 deg here last week and I ran mine in the street with the Extech No. 5 plug, tuned just a little rich for the new fuel, and I couldn't get it over 170. For me that usually means 200 or so on the track, which is what I see a lot of guys saying. Some engines run cool, the heads are so good now, Extech seems to be one of them.

Indoor clay track, air temp low 50's. P4 and P3 plug, didn't matter they both ran cool. The ExTech head is bigger than my Novarossi. Maybe it just cools really good, especially with low outside temps.

That's pretty dang cool under race conditions. Sure you don't need to lean those needles a little? What kind of fuel mileage are you getting?

That does sound pretty cool, but the head is very efficient on these engines. I would try to get it to at least 200.

Just curious...what temp gun are you using? Also, have you tried a friend's gun too, for comparison? Best if possible, get someone with an Exergen to temp it for you.

with a exergen i get 180-190 with a p4 and its crazy fast. i had a ops that did the same ran cool 190 and crazy fast.

TRI40059 - Ex Tech 2056 exhaust system. This pipe give an overall smooth powerband with maximum runtime.

Not with these engines that is on the hot side you have to rember with a head the size they are on these engines they run cooler we usaly run them 180-195 and have more power then you can ask for.

Sorry, mine ran great around 200-210.

Trever, You have to take into concideration that you are in Huntington Beach and I assume race at local SoCal tracks where the air tempurature is significantly cooler then it is out here in the AZ. I just got back from Sidewinder and my engine ran about 15 degrees cooler then it did here at home. I have no doubt that that your engine work amazing at 180-195. Most engines just run a little hotter out here.

Run time for me is right at 10 min. I do have a cheap temp gun, so it's a good idea to check it with a better gun next time.

Not completly true as Colby Poh and me run for club racing at revlation in ontario witch during the sumer is easly 100+ and the engines run at that temp that they do with it cooling doen now they are runing from 180-195 as always when it gets colder they run in the same range for the most part runing them in the 220 range it like runing a engine with a smaler hear over 260 witch as well take's life out of the engine as we have doen a lot of testing with these engines.

We were at sidewinder race as well Colby Kinwalds and my engines all ran about the same range but at that track our engines run cooler then at any other track around mine was in the 170-175 range.

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I know Kinwald's Truggy engine was way over that 200 degree range in the main. That thing was pingging when he came in to pit.