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Old 03-18-2009, 08:29 AM   #76
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I run a few of them.....they run great never get real hot and always have more than enough power to clear the big jumps!!
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-.- D8 621T
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Old 04-12-2009, 07:09 PM   #77
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Thanks to Dave Simpson @ GOTNITROONLINE.COM I picked up another podium finish. Engine ran very smooth with EFRA2010 (one spacer) on my Kyosho ST-RR w/Nitrotane. Usually I run Byrons Gen2 but I did have very good results with the nitrotane.....could have easily gone 11mins.(621t)


If anyone has questions about these engines........ 6 port perfect for buggy or truggy/ Fully modified from factory/ and run like a striped azz ape. Large cooling head heep them sub 220 / run good with 20 percent nitro content to 30/ Usable power all through the RPM range/ also come with the venturi carburator with 3 diffrent inserts. Engines can be purchased via GOTNITROONLINE.COM

I come from running an O.S. SPEED, so the switch was well worth it!!!!
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Old 05-08-2009, 02:03 PM   #78
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Do you guys suggest removing a shim to run 20%
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Old 06-24-2009, 10:21 AM   #79
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well i had a bit of weeping at the front bearing after racing last week so thougt i would change the front bearing,she has done exactly 6 gallon now so not too bad

pics are as it came apart,nothing cleaned up,been run on 25% odonnels,p3 plug and hn2047 pipe.

rear bearing is fine and the conrod/crankpin has zero play..and i do mean no play,amazing build quality and materials used.

might just have to order another one for next year









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Old 06-24-2009, 11:15 AM   #80
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Amazing engine,I have one with more than 6 gallons no play in rod and crank pin and piston and cyl have lots of more life to go. Under rated engine never flames out great power and get 9 1/2 mins per tank cant ask for a better engine
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Old 08-07-2009, 12:23 AM   #81
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Doing well in the larcc series with these engines......check it out.............Dennis Van Dyke Expert Buggy/Truggy......hoping soon to have more points on the board very soon!

http://www.larcchallenge.com/LARCC.P...oints.2009.htm
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Old 10-07-2009, 03:28 AM   #82
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well just coming upto 10 gallons on mine now,only thing i have changed is the front bearing!

theres a tiny bit of play on the conrod and rear bearing so i might just chuck a new bearing in there and let her run her natural life out,still pulls like a train and smooth as butter,idles nice and low and consistent,i have only had 1 flameout in the whole time i have had it and that was when the idle dropped when the pinch went.


compression is still pretty good,ok its not got any mechanical pinch but 10 gallons what more can you ask lol..oh and thats uk gallons which is about 12 U.S. gallons.

its a real shame it makes then too expensive to buy (for me as i live in the UK) and import duty cripples the price but for you guys in the usa..dam your lucky!

dave
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Old 02-16-2010, 08:34 PM   #83
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just wanted to get this thread back to the top. This is an awesome engine, anybody running them
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Old 02-16-2010, 08:54 PM   #84
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I run a 621t in buggy and truggy and let and let me tell you this engine has more all around power than anything ive ever driven there wont be any jump someone at the track is making and you just dont have the power to do it, that wont happen with this engine believe me its got plenty. And on top of its power its got good runtime around 10min in both buggy and truggy. If you havent checked this engine out you are definately missing out on something great engines lasting 12 gallons for $280 with tons of power and good runtime definately a winner.
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Old 03-04-2010, 08:43 PM   #85
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I have a 621P with no venturi/restrictor. Anyone know where i can get one or if any other brands will fit?
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Old 03-04-2010, 08:45 PM   #86
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Not all of the Radical carbs use restrictors.. are you sure your does?
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Old 03-05-2010, 08:36 AM   #87
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pretty sure it does, the throat of the carb is very large before it necks down. Ill post a picture a little later.
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Old 03-05-2010, 11:27 AM   #88
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photo attached.
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Radical Engines-img_2268.jpg  
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Old 03-05-2010, 04:55 PM   #89
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Quote:
Originally Posted by stevef View Post
photo attached.
Steve,

That carb is missing the restrictor. Dave can get you new ones at GNO. If he doesn't have any, I can give him some of mine for him to send you. Also, if your in a pinch, you can use a Dynamite or NR carb on that engine.

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Old 03-05-2010, 06:18 PM   #90
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thanks mike. Ill give them a call.
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