- Will a new 91 w/pump bolt up where a 91 Surpass w/o pump was?
- vspec .21 problem
- OS21TM Question.
- OS 160 AX?
- .91 FX straight pipe??
- os 300 enought power?
- S.O.S. OS FS-40 Surpass camshaft questions. Help needed!!!
- engine mount specs
- OS 18 TZ
- OS 2.00 Lackluster performance
- Obsolete OS Engine Information
- OS 61VF ABC GS A-1
- OS .61 4 stroke
- 18TZ Can't go past 1/2 throttle
- OS FS-70S needles bottoming out
- .91 FX Leaks Fuel at Drive Hub
- FS61 Silencer
- OS-46SF "Reversed"?
- OS IL-300 4 Cylinder - Fuel Setup
- OS .46AX running too rich
- Max distance between OS91FX and tank
- OS 55AX engine & plug life?
- FS-26 AND FS-30
- Stock 91FX muffler Q
- Break in?
- OS200-P getting 6500rpm ONLY....
- Os 55 Ax dying
- OS 3500 BGX-1 problem
- 91 Surpass metallic engine knock at half throttle?
- v-spec issues
- PD-04 Diaphragm Fuel Pump
- FS 40 Stuck valves
- OS 1.20 4-Stroke Questions
- .55ax noise
- OS MAx .10 ?
- OS FS 91 w/pump peak RPM
- os91fx and os61fx
- OS 25 FX
- will there be any new OS engine soon?
- os .18
- Figured it out..... Not worth reading
- OS FT-160 leaking fuel
- MOVED: Cline vs. Perry vs. Iron Bay
- 91 FX backplate ?
- Best replacement for OS .46 AX
- 30vg warranty
- OS 120 AX, No response to needle valve adjustments
- os 91 fx rebuild
- Spin start adapter for OS .21 V-spec
- MOVED: Good .12 engine
- exhaust on 55ax
- Letters code below mounting lugs
- OS 91 RUNNING GOOFY
- what is a os cz hirobo
- Ideal .55ax rpm range
- O.S. CV-R bump start conversion
- delete
- 1.60 prop sizes
- OS .52 & .56 exhaust thread pitch.
- os 120ax + remote tank = :(
- os 120ax
- exaust 4 stroke
- O.S. 61 F/S Touchy high speed needle
- Old but new OS 91 surpass with choke valve
- The Amazing 120AX
- Need upgrade carb on OS-FL70
- Os FS30 muffler and needle valve extensions
- 91 surpass prop size
- torque specs
- FS-200s and FS-200u; what's the difference?
- OS Surpass ii idle problem
- MOVED: O.S. FS 120
- MOVED: OS 200 for Pattern?
- OS FS-48 Replacement Head
- *OS 120AX & Nitro Content*
- Inverted OS FL 70 won't lean out.
- O.S. FS-120 III Surpass 4-Stroke with pump "NEED HELP"
- os max 140 rx
- need some help with my 18tm
- O.S.120 Carby does any body Know
- OS H60FGR Blackhead
- Afterrun oil? O.S. FS-91 w/pump
- O.S. FS-91 w/pump, peak RPM?
- oil content / FS-91 II w/pump
- os 56 fsa
- 40 LA Fuel Inlet Fitting Came Loose
- Possible largest prop for OS .46 AX
- *OS 120AX Bearings*
- os 46 ax running a 20000 rpm
- rywill these engines fit??
- os rz max
- Hyper 50 damage
- .91 FS II Surpass leaking and losing power
- 52 Surpass Tappet Gap
- OS21TM air leak?
- O.S. 46FS piston ring
- os 91fs no compression
- 1.20ax prop question
- FS-70 Ultimate fix
- MOVED: O.S. 61 RF - Tune pipe - Hanno II Sleeve ABN/ABC
- OS FL70 four stroke
- O.S 1.20FS Question?
- OS Max 25 Sticky
- OS 1.20 FS runs erratic
- OS .61 FX
- 55AX sensitive needle
- FS120 Surpass II pumped low speed needle setting
- FS-120 Surpass III Engine w/Pump What fuel?
- Where can I send the engine back in the UK?
- v spec carb
- few questions on the .21 V-Spec
- OS 1.20 pump regulator
- AX .55 Low Speed factory setting
- varnish on 6 month old engine
- One way bearing slipping
- SF .46P setup
- OS FS91 II ticking
- 18CV-RX in Tmaxx
- OS 32SX air leak problem
- 91FX break-in with Bisson muffler
- Question on OS 75 AX
- Head Shim for 21TM w/30% Nitro
- OS61SX-WC, changed fuel to lower nitro
- .18tz hard to start
- OS FS-91 / w Pump, should I avoid castor oil?
- 55 AX perry pump ??
- OS61Fsr
- OS FS-91 / pump; runs when needle valve fully closed?
- What is the part number for the most updated needle valve for a 91FX
- Idea to Secure Muffler on OS FS91 II - Is it OK?
- os 160 FX woodruf key
- 91 FX Leans Out?
- Exhaust connection threads
- 18tz w/ 18tm parts
- .18 cvr-x Stalling
- OS FT-160 Gemini Tank question
- 18tm
- O.S. 1.60 Back Plates
- OS Max .91 Surpass 4-Stroke engine - Pipe & Muffler Question:
- .91 Surpass crankcase tap
- Question about O.S. 46 AX carb
- OS FS-200S Pump
- WHICH PROPELLER FOR OS 91 DF?
- OS-120AX quits
- Should I send my .55ax in?
- O.S. 21VZ-B V-Spec Buggy/21J
- How to take cooling head off .21tm?
- New OS 81 4-stroke
- OS 52 Four Stoke Break-In
- Good plugs for the .21TM?
- OS 70 Ultimate carb question / solution
- OS 20 FP
- Gasket Set cross reference?
- o.s. .18tm carb?
- 15CVR-X and 18CVR-X Starting shaft interchangable?
- OS18TM question
- Missing Screw Size?
- FT 160 Gemini
- MOVED: Magnum XLS 52
- 91 Surpass II pump problems (HELP)
- New O.S. 81 4 stroke [ abit warm ]
- 3D prop for .46 AX??
- OS FT-160 valve adjustment
- 46AX - Fine grit in filter after break in
- O.S. 91 C-Spec conversion to acft.
- OS 120 surpass III w/pump
- OS18TM problem
- 55ax muffler
- OS 91 FX Muffler
- Hyper 50 Blown Piston again!!
- os 18tz head
- 46AX Liner issues
- 120 AX Break-in Prop
- 1989 OS MAX 46 SF-S abc STARTING PROBLEM
- rpm surging 4stroke 52 surrpass
- OS18 TZ Pbs
- 120 ax max recommended rpm
- 50SX-H Hyper rich low end
- os 70 surpass, stopping
- FL70 muffler pressure to the sump
- FL-70 loss of power
- OS 52 4 stroke will not idle
- OS FS-52 4stroke in hot weather.
- vspec problem
- OS 200 FS settings ??
- In need of a 70 Surpass II crankcase - Discontinued?
- OS 61 FX dead sticking
- OS FS61 head screws
- AX55's
- O.S 55AX vs. 61FX?
- O.S. 61 Question?
- where are os .21 vzb manuals online?
- Will gasoline damage O rings?
- Which engine is that???
- Fitting Prop to an OS FT 240 (300)
- OS .32 sx cylinder head???
- 55 AX Mid Range
- OS FS61 cam bearing removal
- OS 21 VG stall after half tank
- replacement piston ring for OS MAX 50 SX
- OS 91FX Problem
- FS-1.20S III
- OS 18 cvr won't say running?
- OS18TZ-TX crankshaft into 18TM
- Bearing replacement OS 1.20FS Surpass
- 91 surpass vs 91 surpass pumped
- 91 surpass factory mixture setting
- O.S. .18 cv-rx
- OS 91FX Break-In help
- 4 cycle assembly question
- FR5-300 Sirius radial being discontinued?
- A3 plugs vs the RCAT glow starter
- Motor mount for OS 200U
- OS Carb
- idling screw
- Which fuel for both O.S. FX25 & O.S. FS56a
- Honing a 46 FX
- OS70 backfiring
- Minor pitting on piston.
- OS 61FX lowspeed Needle valve location?
- OS46AX engine
- fs91/p adjust...
- .46 LA fuel and prop recomandations
- fs-91/p breakin problem
- Best prop for OS 1.20 AX
- O.S. 15 LA Won't Start
- FS56a RPM
- YS/Saito 20/20 in OS 46FX
- parts for 2nd gen. 1.20w/pump
- new 37SZ-H Problem
- o.s 21 tm tmaxx minifold
- Vspec VZB .21 (possible connecting rod dmg?)
- OS 61 RF Thrust washer
- os .21tm factory settings
- 91fx max rpm
- Hyper 50 problem??
- Rust: pre-existing ??
- Trouble With New OS .46AX
- OS 91FX can't shut down
- OS .61 FSR carburetor
- O.S. .50SX Bearings
- 18CV-R and 15CV-R
- O.S. 4BK Carb Replacement
- Engine ID help
- os.18cvrx 11j rotoary carb wont start
- FP-60 liner
- 1.20 FM OS not running
- Replacement bearing for OS .30VG-P
- O.S. FSa-81 Carb Settings
- 15CV-R or AQ .18 more powerfull?