- YS 1.20 AC parts availability...
- YS F-91 ACH Can I use it on an airplane?
- YS .91ST4 Conversion to prop
- YS 140 Sport - Mounting
- DZ Tuning
- YS 120 AC starting difficulties
- YS 63S carburettor
- YS91FZ Backfiring
- YS 110 super rich low end??
- 63s Clicking Valves
- YS 91FZ not running
- 63S exhaust ?
- YS 63S … may be a problem…
- 110 FZ Throttle Travel
- Prop nut sizes for 63 and 110
- 140L broken con/rod---
- PowerMaster 30% Heli Fuel Use
- .63 Muffler Baffle
- Cracked Rocker Arms
- availability
- Current YS thrust ratings
- YS110 bearing failure
- 1.20AC..... no fuel pressure
- YS 110!
- YS 63 vs 63S
- In flight idle wandering, YS63
- 140L seems down on power
- YS 140fz startin problem
- Homebrew for YS?
- YS website down?
- 63FZS regulator ???
- YS110 Fueling Set Up
- 110 going thru plugs
- YS 170 DZ?
- YS 63 Leaking Regulator
- YS110
- 140DZ
- Is a YS 160DZ more difficult to handle than a 2-stroke?
- prop for 120 AC for max speed
- Poor Transistion YS63
- Is the 160 a good friend for all days use?
- YS 61F.R - Long Stroke Airplane Version
- Trying to Break in new FZ110
- Supercharger....How's it work?
- YS 110 valve adjustment OOPS!
- YS 110 spun drive washer
- YS 45 FR/FS Tuned Pipes
- YS 91 AC Has No Compression. HELP!!!
- YS after-run oil
- YS Dealers
- which air filter will fit a .63?
- YS 45 FS with tune pipe
- Am I hurting my 63 running 12,000 rpm?
- YS engines for Catalina
- Do i use a 63 or a 110
- YS 91AC rust from leftover fuel
- YS 61.S
- YS91FZ Throttel sticking
- 1.40 sport
- YS 91AC -- Diaphragm
- YS 160DZ pipe
- YS 50ST heli engine
- YS140 FX idle problem
- 18/14 fuel?
- YS1.10 issue
- needle valve compatibility
- Tru-turn prop adapter for YS63?
- 110 prasies
- Saito Glo plug??
- MOVED: YS 63 + Alley Cat = Fast
- YS 91 Thank You
- YS63 Question
- Pressurizing the system
- YS110 regulator issues
- YS 63 - support problem
- Inverted YS 63
- Bent crank
- Worn threads YS 120SC
- YS 91FZ muffler wire support &/or locktite
- YS 110 bad vibes
- YS 120 Which version?
- YS140 DZ problem - help!!!
- YS110 leans out
- Parts availability for older YS 60FS
- YS91
- YS 63-S = INCREDIBLE ENGINE!!!
- YS .91ST4 Heli ?
- FZ63 problem
- where to buy muffler
- YS110 Regulator Setting
- Exhaust Pipe Threaded Rod for DZ140
- Is a YS engine factory pre-set to run out of the box?
- FZ110 fuel problems
- Ys 120 header pipe
- YS110 Idle Problems
- Fuel tank question
- YS 110
- Question on YS 91 crank case
- Adjust valves when???
- Which 30% Cool Power?
- will a backwards facing Tettra tank work?
- YS 91 or 110
- Inverted YS63
- ys 120 cutting off
- YS-63 surging problem
- Check valve
- 140L problems
- New to YS
- Sport 1.40 low speed needle fit
- Carb barrel binding (.45 FS)
- YS 110 failure
- YS 120SC newly rebuild 140 need propeller
- Muffler for YS45
- 140DZ Woes
- Coolpower
- YS-120SC Starting Problem
- Tank Placement and inverted YS 91
- YS 91 idle problem
- Starting points.
- 140 sport fuel leakage question
- Regulator Questions
- 120SF O-Ring??
- Break in question
- AFTER RUN OILS
- Yet another muffler question
- YS 63S -- Idle problem
- YS 140 hoses
- 110 with no Muffler?
- YS 91 AC in in the line
- YS DZ pump problems alot of them!
- YS 91 HELP!!!!!!!!! PLEASE!!!
- YS smoke
- ys 120 head
- 63FZS
- YS 63 FZS refuses to idle or run properly from new
- YS low speed needle
- YS 1.10 Fuel
- YS61 prop
- YS160 muffler
- 91FZ Muffler Baffle
- 1.10 flaming out
- 110 low end all the way in?
- Strange Regulator setting on 110
- YS63 needle valve set screw size?
- New ys 63 tuning help
- Tuned pipe for YS 110
- YS 120SF
- 3 bladed prop for 1.10?
- YS .91AC plumbing question
- 120 wont stay running
- Air in fuel line
- YS 110 idle problem
- Erratic YS63
- Propeller Shaft size for YS 110
- YS .91
- Cool power 15% for ys engines
- YS 110 throttle up question
- ys63s and ys63fzs - whats the difference ?
- Sending my YS 63S In for Repair
- YS 140 FZ problem
- Suddn change in YS140DZ performance
- YS 91FZ big problem
- .63 regulator, change diaphragm or whole regulator?
- YS 110 low and middle problems
- F120 Service
- Do I need a check valve? YS63
- YS 140 Tank
- WHich 140 to use
- YS 61ST2 heli engine for airplane use?
- YS 63 dead?
- YS 110 info
- YS 110 stockup with metal particles
- YS 1.1 and .91 same valve cover ?
- YS63FZ-S, I need to go back to square 1 ARG
- FZ 63S
- 140L rough idle
- YS 63 FZ Starting procedure
- Smoke system by tank pressure?
- Inconsistent RPM for YS63S
- YS 63S Prop Question
- YS 110 pump
- 63 FZ
- YS 120SC, NEED A LOW speed needle valve
- ys 63 loads up, quits
- 160 Dz - Hunting
- Replace gasket??
- ys110 high rev problems
- DZ160 Tuning
- APC 16.5 x 5W Prop for YS110
- 63 FZ, awesome engine!
- YS110 quits when it idle's
- YS 63 Prop Question
- Prop for YS63S?
- YS 63S plumbing questions
- YS 91 AC help
- YS 63 in Funtana 40
- YS 120FZ
- .63 s valves
- Cam Gear Bearing
- YS 120 SF lot of smoke
- YS - .63S in for repair
- YS 61LS documentation needed
- 1.60 DZ Question
- 140dz starting
- 160DZ problem
- .63 s exhaust
- YS 63 s
- 1st Four Stroke ............. YS FZ63s !!!
- ys 140 problem
- 30% Heli...
- ys 120 ac fuel lines
- Damaged threads on 140 DZ crankshaft
- YS 63 Help
- YS110FZ Fuel Pump Pressure
- leaky YS110
- 160DZ Problem
- YS 140 Propellers
- YS .91 AC ROCKS
- 91 FZ inverted and airbox problem
- 120SF max temperature
- YS .63 regulator vs. Cline type regulator
- Remote fuel and YS 91FZ
- YS140L or 140 sport
- Low end needle query
- YS 1.40 Sport Problem
- YS1.10
- YS 140 running rough at full throttle
- 120SF Problems
- Odd needle setting on a 140?
- idle problem ...1.10
- 140DZ green valve
- Good starting point YS 1.40 sport
- YS 110 Lifter Issue?
- Differences between 120SF and 120FZ
- YS 1.4 EXHAUST Choice??
- 160 Exhaust temp
- YS 1.40 engine quitting????
- YS 110 FZ Availability
- lost muffler baffle
- YS61SH
- YS110 - SOS!!!
- 140 sport problem
- ys 63
- 1.40 L Issues
- YS 160DZ Fuel Consumption
- 91 AC
- 140DZ set-up
- YS 110 Issues
- YS 120NC bubbles in fuel line
- Threw the prop