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Old 03-06-2010, 03:28 AM   #91
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i used the old ninja carb on mine,basically because the ops carb has a long throw on it compared to all my other engines and if i wanted to do a quick engine change trackside to another engine it meant messing about changing linkages etc..

the earlier ops carbs had a tapered neck so didnt use restrictors..the newer types do as in your picture.
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Old 05-04-2010, 01:26 AM   #92
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Hey all.
I have nearly 3 gallons of 30% Nitro that I really oughta use. I notice in my Radical boxes I have 2 spare shims, 1 thick & 1 thin. Which should I add to use the 30%.
Fastboy (Dave) OPS still going strong since the pinch, I just re-did the bearings again as the motor wintered in the shed and they got a bit rusty, (no after run oil) 15 UK gallons and counting.
I ran the Radical on Sunday, qualified 2nd for the C, bumped up to the B and was running second when a drive shaft let go with a minute to run.
Gotta love these motors.
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Old 05-05-2010, 08:46 PM   #93
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i got 2 thicks and 1 thin in my engines running 30%
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Old 05-06-2010, 12:06 AM   #94
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Thanks Gofast,
I'll throw another thick one under there.
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Old 05-31-2010, 11:02 PM   #95
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Heads Up time guys.
Dave at GotNitro has a new batch of OPS/Radicals in stock.
Sporting a super new sexy head as well and at a great price too.
Very nice.
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Old 05-31-2010, 11:24 PM   #96
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Quote:
Originally Posted by kennyrodg View Post
Heads Up time guys.
Dave at GotNitro has a new batch of OPS/Radicals in stock.
Sporting a super new sexy head as well and at a great price too.
Very nice.
Thats the old OPS SFV21B head, I ran that motor for over a year with a GRP carb with 6mm restrictor. Great Motor.

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Old 06-01-2010, 07:01 PM   #97
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yes there is a new radical engine, it features new head design for better cooling and new carb for better efficientcy, should be running one this saturday. I will post up and let you know what i think, cant imagine making an already awesome engine better, should be sweet.
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Old 06-11-2010, 12:18 AM   #98
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Just a update from a OPS driver in Australia

lve been running the ops 21 in Australia for the past 12 months l only run buggy class and my first engine is still going strong after 11.5 gal (44 lts)
l changed the rear bearing to ceramic at the 3gal mark just to be sure but my second ops has now done 9gal on the original rear bearing and it still looks and feel brand new
l normally run 30% nitro with 22thou head to button clearance and a 2045 rb pipe with a long header

l am just trying a new fuel mix of 45% nitro and using a no7 ops plug and a head to button clearance of 25thou

also the fuel l run always has 12% oil (8% syn + 4% caster)
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Old 06-11-2010, 11:27 PM   #99
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The longevity of these engines is something to behold eh !!
My first OPS 621T is still tearing it up at 15 gallon mark. Fair enough it's had a rod and bearings but it's seen 2 full seasons and a season and a halfs worth of part time action. I moved over to the Radical last year and I'm fully expecting the same level of performance from them. I just took delivery of one from the new batch thanks to Dave at GotNitro, It's a very nice looking mill.
What gets me with these engines is that they're so easy to tune,they hold tune so well, they'll idle all day long, they rarely if ever flame out and they don't eat plugs. At 9 a pop that's a real bonus.
Yep, serious fanboy here LOL.
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Old 07-18-2010, 01:58 PM   #100
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All I gotta say is oh my damn! This engine is freaking insane! Sits there and idles perfect, has tons of power. The straight away i was on was at least 150ft and this engine is still pulling hard at the end. It really pushes the truggy (MBX6T) around nice. Cant imagine how it would feal in a buggy. Awesome!!!!
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Old 07-18-2010, 02:29 PM   #101
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Glad you like it dude !!
Spread the word.
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Old 07-18-2010, 09:10 PM   #102
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GoFast72 just ran his Radical at the MO. Pro series this weekend and I temped it after the 30 min. main and it was 212 deg and it was running great, I am very impressed with these engines!!!!!
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Old 07-19-2010, 12:11 AM   #103
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i received my engine thursday. and it looks amazing!

i will start running it in when i build my engine heater and i will take some pics and videos.

i will keep you updated

many thanks for an amazing product!

lewis
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Old 07-19-2010, 03:45 AM   #104
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Greetings from asia, same i have the red heatsink and 7+gallons still have great pinch and power. Saw the yellow one and could'nt pass it up.
Called dave, and now waiting for it to arrive.

Highly recommended engine. You will be surprised.
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Old 07-19-2010, 01:30 PM   #105
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can I run one of these .28 motors in a MT like a Savage or Revo? Probably a overkill price wise but looking for a dependable mill that will last and has good power.
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