radical 621 p

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Old 05-18-2008, 02:49 PM
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Default radical 621 p

anyone running one of these? best pipe, plug? how many gallons?
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Old 05-18-2008, 02:56 PM
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The P version works well in buggy, but didnt work too well in truggy, but what i suggest to run is the JP3 pipe, and an OS P3 plug.
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Old 05-18-2008, 04:23 PM
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P3 for the plug, the Rad. 2010 pipe with adjustable header works really good with great runtimes. Alot of people said the JP-1 and 2 worked really good too.

Avg. engine temps usually run around 200...yes I said 200. None of mine ever ran more than 230 on extremely hot days.

I had 2 621T's that had over 8 gal. each on them...very good engines. I think they are being sold in the U.S. by their proper name again....OPS. I heard TKO was distributing them now.
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Old 05-18-2008, 05:03 PM
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I ran both the OPS/Radical pipe and the JP-3. The OPS pipe gave me better runtimes but the JP3 really made more power with good runtimes.

You dont want to run the motor at anything over 200 degrees. 200 degrees on these motors is like 250-260 on anything else.
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Old 05-18-2008, 05:40 PM
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thanks for responses. i have jp1 and 2. should i look for jp3? i had one in the past and was not impressed with it on a v-spec. .... yes tko has them on their website under ops. they have a crazy looking green head. i wonder what has been changed on the new ops vs. the radical? evrything i hear about the new engine is positive. supposed to be stupid fast?
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Old 05-18-2008, 05:49 PM
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I heard these engines are screamers, I just picked one up on a screaming deal.
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Old 05-18-2008, 06:25 PM
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Originally Posted by buckeye-mac View Post
I heard these engines are screamers, I just picked one up on a screaming deal.
I ran for Radical back in the day....OPS makes great engines. I'm really glad to see them back in the U.S..


They are screamers fo sho....really smooth and more power than you can stand. I've actually heard through the vine that the interals look even better and cleaner than they did under the Radical name.
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Old 05-18-2008, 10:41 PM
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Originally Posted by skeller View Post
P3 for the plug, the Rad. 2010 pipe with adjustable header works really good with great runtimes. Alot of people said the JP-1 and 2 worked really good too.

Avg. engine temps usually run around 200...yes I said 200. None of mine ever ran more than 230 on extremely hot days.

I had 2 621T's that had over 8 gal. each on them...very good engines. I think they are being sold in the U.S. by their proper name again....OPS. I heard TKO was distributing them now.
i use to get the same, but the reason why i was getting such low temps is because of the cooling head. like somebody else just mentioned, if you are reading 200, more than likely you are around 250 in comparison, but again, i never looked at my temp gun most of the time, i just tuned this thing for performance.

and i agree, its a decent mill, but a pita to break in., lol
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