OPS/Radical Off-Road Engine Parts

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Exhaust Header to Pipe Springs OPS Next/SFB-21B and Marine Next Engines Rear Crankcase Gasket Carburator Servo Linkage
Exhaust Header to Pipe SpringsOPS Next/SFB-21B and Marine Next Engines Rear Crankcase GasketCarburator Servo Linkage

Exhaust Header to Pipe Springs 4pcs per package approx 22mm long end to end. These springs used for adjustable pipes.

Rear Crankcase Gasket for all Next Nitro Engines including marine in-boards/marine out-boards and SFV-21B Buggy Engines. If you have the Radical line of engines like 621P and 621T use 573120 1pcs per package

Carburator Servo Linkage. Linkage from servo that attached to ball on carburator. Fits Radical 621T, 621P and 628T carbs.

$4.99

$1.99

$9.99

Carburetor Block O-Rings Set Carburetor Body All OPS/Radical On/Off Road Engines Carburetor Rubber Boot
Carburetor Block O-Rings SetCarburetor Body All OPS/Radical On/Off Road EnginesCarburetor Rubber Boot
Carburetor Block O-Rings. O-rings that go on base of carburetor all Radical engines 2pcs per package. The thicker o-ring goes in lower slot and thinner goes to upper slot on block.

Carburetor Body All OPS/Radical Engines. Replacement Green Anodized Carburetor Body for all OPS and Radical Engines. All Aluminum beautifully machined replacement part. Standard carb body to be used with inserts sold separetly.

Replacement Carburetor Rubber Boot for Radical 621T, 621P and 628T.

$2.99

$38.00

$8.99

Complete Carb Assembly for All Radical Engines Cone Flywheel Crankcase Bolts
Complete Carb Assembly for All Radical EnginesCone FlywheelCrankcase Bolts
Complete Carb Assembly for All Radical Engines. Complete with 3 venturies.

Replacement Cone Flywheel for Radical 621T, 621P and 628T

Replacement Radical/OPS bolts all 3.5cc and 7.5 marine Nitro Engines 10 per package.

$59.99

$5.99

$6.99

Exhaust Gasket (Rubber) Front Crank Bolt Std Thread Long Header Exhaust Spring for On and Off-Road 3.5cc
Exhaust Gasket (Rubber)Front Crank Bolt Std ThreadLong Header Exhaust Spring for On and Off-Road 3.5cc

Replacment red rubber exhaust gasket for the Radical 621T, 621P and 628T. OPS/Radical Brand.

Replacment Front Crank Bolt Std Thread. There is 2 bolts per package.

Header Long Spring for off and on-road exhaust 1pcs per package

$5.99

$1.99

$3.49

High Speed Needle for OPS/Radical 3.5cc Nitro Engine Main Needle Housing New Cinderella Design OPS/Radical Cooling Head
High Speed Needle for OPS/Radical 3.5cc Nitro EngineMain Needle HousingNew Cinderella Design OPS/Radical Cooling Head
High Speed Needle for OPS/Radical 3.5cc Nitro Engine Carburetor's. Fits all 3.5cc carbs. Does not come with o-rings order them separetly.Main Needle Housing for Radical carburator. Fits 621T, 621P and 628.New Cinderella Design OPS/Radical Cooling Head all 3.5cc off-road nitro engines.

$9.99

$9.99

$39.00

O-Ring Small (2pcs per package) OPS .21 Head Shim OPS .21 Wrist Pins Clips
O-Ring Small (2pcs per package)OPS .21 Head ShimOPS .21 Wrist Pins Clips
O-Ring Small for all carburator needles on all Radical Engines/OPS 3.5cc engines. Package of (2pcs) o-rings per package.Radical 621T and 621P head shim. The shim is .1mm comes 2pcs shim/head gasket per package.Wrist pins eclips for your Radicals and OPS .21's including marine 3.5. Package 2pcs.

$1.89

$1.99

$2.99

OPS Exhaust Spring Set Small 3pcs OPS Turbo Glow Plug #6 or #7 Heat Range OPS .21 Matched Tuned Off-Road Competition Pipe Kit
OPS Exhaust Spring Set Small 3pcsOPS Turbo Glow Plug #6 or #7 Heat Range OPS .21 Matched Tuned Off-Road Competition Pipe Kit

OPS/Radical Exhaust Spring Set Small 3pcs

Original OPS Turbo Glow Plug's Manufactured by OPS in Italy. These are 24ct GOLD Plugs designed for the RADICAL/OPS Turbo Head off-road engines. The #6 Turbo plug is the hottest plug OPS makes. Your choice #6 hot plug or one heat range cooler #7 turbo plug. Top quality last forever!!

NEW OPS MATCHED TUNED Off-Road Competition Pipe Kit. This OPS R/C Aluminum Pipe Kit is specifically designed for all Radical/OPS Off-Road .21-.28 competition engine's, approved EFRA 2028 pipe. It is ROAR legal. Comes complete with all springs,...

$4.99

$7.97

$79.99

OPS/Radical 621P/621T/628T/SFV21B Your Choice Rebuild Combo OPS/Radical Carburator Spray Bar OPS/Radical Connecting Rod all 3.5cc Engines
OPS/Radical 621P/621T/628T/SFV21B Your Choice Rebuild ComboOPS/Radical Carburator Spray BarOPS/Radical Connecting Rod all 3.5cc Engines

Rebuild your Radical 621P/621T/628T Nitro engine. Also the OPS SFV21B off-road takes the 621T Rebuild.Your choice 621T/621P or 628T; Piston/Sleeve, Rod, Wrist pin with 2 clips, 2 rear crankcase gaskets. All in this Combo over $190 value.

OPS/Radical Carburator Spray Bar. For all Radical engines.Now's the time to change that rod guys. Save you $$'s in the end. Connecting Rod for the Radical 621T, 621P and 628T. Also fits the OPS Track .21 and SFV21B OPS Off-Road. This 60711 rod also fits the Marine .21 with a 6 hole cylinder head bolt pattern.

$169.99

$12.99

$38.00

OPS/Radical Crankcase Cover Gasket 3.5cc OPS/Radical Engines Carb Cinch Collar OPS/Radical Replacement Piston and Sleeve 621T
OPS/Radical Crankcase Cover Gasket 3.5ccOPS/Radical Engines Carb Cinch CollarOPS/Radical Replacement Piston and Sleeve 621T

OPS/Radical OPS 3.5cc Rear Crankcase cover gasket, 1 gasket per package. Fits all 621T/621P and Wave Marine Nitro Engines. 

OPS/Radical and OPS Marine engine cinch collar with allen wrench. Hold's carburetor to block. Includes stainless steel collar, orings, bolt and wrench.

OPS/Radical Factory modified replacement Piston and Sleeve for the Radical 621T and OPS SFV-21B Torque Version. Also the OPS SFV21B off-road takes the 621T Rebuild. This is a factory modded piston and sleeve for the off road Radical/OPS engine....

$1.99

$4.99

$129.99

OPS/Radical Venturi Carb Inserts Piston and Sleeve for Radical 628T Replacement Crankcase O-Ring Cover Gasket
OPS/Radical Venturi Carb InsertsPiston and Sleeve for Radical 628TReplacement Crankcase O-Ring Cover Gasket
OPS/Radical Complete set of carburetor inserts, 6,7 and 8mm.Factory modified replacement Piston and Sleeve for the Radical 628T.

Replacement Crankcase O-Ring Cover Gasket for all 3.5cc OPS/Radical including Radical 621T, 621P and 628T, OPS Track, NEXT and SFV-21B Nitro Engines, one per package.

$10.99

$129.99

$3.99

OPS 3.5cc Replacement Crankshaft OPS Front Crankcase Bearing 3.5cc Replacement Head Bolts
OPS 3.5cc Replacement CrankshaftOPS Front Crankcase Bearing 3.5ccReplacement Head Bolts

Replacement Crankshaft for the Radical 621T, 621P and 628T. Aso same crankshaft for OPS Track .21 and OPS SFV-21B Nitro Engines

Replacement Front Crankcase Bearing for all 3.5cc on and off-road .21 Nitro Engines Size is 19X7X6.

Replacement head bolts for all 3.5cc on and off-road including the Radical 628 package has 8pcs

$91.60

$19.30

$12.90

OPS/Radical Replacement Piston and Sleeve 621P & SFV-21B OPS Rear Crankcase Bearing 3.5cc Resin Green Washers 2pcs
OPS/Radical Replacement Piston and Sleeve 621P & SFV-21BOPS Rear Crankcase Bearing 3.5ccResin Green Washers 2pcs
Factory modified replacement Piston and Sleeve for all Radical/OPS SFV-21B On/Off road 3.5cc engines. OEM replacement for Track 21 and Radical/OPS 621P & SFV-21B. Power version of the 621 product line. Note differant porting then the 621T for torque engine.

Replacement Rear crankcase Bearing for Radical 621T, 621P and 628T. Size is 13X25X6.

Replacement fiber resin washer that fits between the brass needle housing and the carb body. Requires (2) of these washers to prevent leaking. Fits Radical 621T, 621P and 628T. Comes 2pcs in package.

$129.99

$24.60

$2.99

Standard Plug Head Button All 3.5cc Engines Turbo Head Insert 621T and 621P Turbo Head Insert 628T
Standard Plug Head Button All 3.5cc EnginesTurbo Head Insert 621T and 621PTurbo Head Insert 628T

OPS standard plug head button for all .21 size engines including the Next Marine and On-Road new engines. This standard cylinder head button allows the racer to fine tune the engine to their glow plug preference by offering an optional standard...

Replacement Turbo Button for the Radical 621T, 621P.

Turbo head button insert fits Radical 628T.

$29.00

$18.00

$22.99

Wrist Pin and 2pcs Clips
Wrist Pin and 2pcs Clips
Replacement wrist pin and clips for the Radical 621T, 621P, 628T. Includes one pin and two clips.

$9.25

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