Skip to content
Phoenix MotosMotocross & Enduro - Bikes, Repairs & Parts
  • Home
  • Services
  • Bike Sales
    • Kuberg Electric Motorcycles
  • Parts & Tools
  • Resources
    • Troubleshooting a 2 stroke bike that won’t start
    • Engine Spec Data
    • 2 Stroke tuning calculators
  • Bikes sold
    • 1985 Honda CR250 – fresh top end rebuild
    • 1983 Suzuki RM80d
    • 1974 Yamaha rd350
    • 1986 Honda CR500
    • 1971 Honda cb450
    • 1982 Yamaha yz490 – ran last year
    • 2x Yamaha L5TA 100cc trailmasters
    • 1998 Kawasaki kdx200 – good compression
    • 1985 Yamaha yz490
    • 1974 Yamaha TY250
    • 1986 Yamaha Yz490s
    • 1984 Kawasaki kx80
    • 1977 Yamaha yz250d
    • 1974 Honda MR50
    • 1968 Triumph Trident T150t
    • 1982 Honda XL500
    • 1975 Honda ST90 – incomplete
    • 1973 Rickman Zundapp
    • 2x Triumph Tiger Cubs
    • 1994 Suzuki RM250
    • 1966 Bultaco Mercurio
    • 1983 Kawasaki KX250
    • 1979 Yamaha IT400
    • 1989 Yamaha YZ250
    • 1986 Yamaha YZ490S
    • 1980 Honda CR250 Red Rocket
    • 1986 Honda CR500
    • 1985 Husqvarna 500XC
    • 1983 Kawasaki KX250
    • 1979 CanAm MX5 370
    • 1977 Suzuki RM125b
    • 1984 suzuki RM500
    • 1982 Honda CR480
    • 2006 Honda Crf450
    • 1970 Honda qa50 k0
    • 1972 Suzuki RV125 vanvan
    • 1978 Maico MC400 Magnum
    • 1973 Triumph T140v chopper
    • 1974 Triumph Trident T150v project
    • 1979 husqvarna 250CR
    • 1971 BSA B25T
    • 1964 BSA b40 super star USA
    • 1971 Triumph Trident T150t
    • 1994 Suzuki GSXR 1100
    • 1977 Husqvarna 360 Auto
    • 1969 triumph 250 trophy tr25w cafe racer project
    • 1979 Triumph Bonneville T140d chopper project
    • 1970 Maico MC 360 square barrel
    • 1978 Yamaha GTMXE – GT80
    • 1977 Yamaha YZ250D
    • 1987 Yamaha YZ250T
    • 1986 Yamaha yz250s
    • 1981 Yamaha yz250H – rust in crank cases
    • 2x Yamaha yz125h – 1 complete 1 parts bike
    • 1982 Maico 490 Alpha1 £2900
    • 1998 Honda Fireblade CBR919rr SC33
    • 1978 Yamaha YZ250E
    • 1979 Yamaha IT400
    • 1977 Honda CR125m – stuck motor
    • 2001 Honda CR500 – holy grail of CR’s
    • 1986 Honda CR125
    • 1987 Honda cr125 – stuck motor
    • 1984 Honda Cr500 – compression & spark
    • 1984 Honda CR500 running bike
    • 1978 Husqvarna 250CR
    • 1989 KTM 250 MX
    • 1979 Suzuki RM60 stuck motor
    • 1994 Yamaha yz250 – missing rad scoops and carb
    • 1986 Yamaha YZ490 – stuck motor
    • Yamaha IT465
    • 1980 Maico MC440
    • 1985 Honda CR250
    • 1979 Honda CR250 red rocket
    • 1983 Honda cr480 – not run for 2yrs
    • 1981 Husqvarna 250CR – ran 5yrs ago
    • 1980 Yamaha YZ465 – good runner
    • 1980 Kawasaki kx420
    • 1975 Yamaha Yz400 – stuck motor
    • 1986 Honda cr250 – unused for 5yrs
    • 1987 Kawasaki kx125
    • 1983 Kawasaki kx125
    • 1986 Honda CR125 – dry stored for 5 yrs
    • 1980 Kawasaki KDX 400 – has title
    • 1987 Kawasaki KX500 – no rear tyre
    • 1981 Yamaha yz250 h – restored condition
    • 1983 Yamaha yz125
    • 1983 Yamaha yz125
    • 1979 Honda CR125 Elsinore with DG head and fork internals
    • 1983 Yamaha yz80 – motor turns over
    • 1980 Can Am MX6 125
    • 3 suzuki RM80 project bikes
    • 1970 Yamaha CT1B 175cc
    • 1970 Yamaha CT1B 175cc
    • 3 suzuki RM80 project bikes
    • 1979 Yamaha yz250f running bike
    • 1974 Yamaha TY250
    • 1979 Bultaco Pursang 250 Mk10
    • Suzuki Bearcat B105p 120cc
    • 2 Ossa Mar & 2 Ossa Pioneers
    • 1977 Yamaha yz80d
    • Yamaha YZ465 – stuck motor
    • 1983 Yamaha Yz490k blue and white running bike
    • 1987 Yamaha yz250 – ran before parking up
    • 2000 Husqvarna 250WR
    • 1985 Kawasaki kx500 – engine stripped down
    • 1980 Honda CR80
    • Husqvarna 390 OR – stuck motor
    • 1974 suzuki TM75
    • 1985 Kawasaki kx250 – fresh top end
    • 1976 Maico AW400 in AW250 frame – stuck motor
    • 1983 Yamaha yz490k rolling chassis
    • 1986 Kawasaki KX250 – had top end rebuild
    • Yamaha yz490 motor turns over
    • 1980 Honda CR250 Red Rocket – partially dismantled
    • 1980 suzuki rm400t – restored
    • 1988 Yamaha yz490 u lowrider ?‍♂️
    • 1987 Yamaha yz490 with desert tank
    • 1986 Honda CR500
    • 1987 Honda Cr500 running bike
    • 1971 suzuki TM400
    • 1976 honda MR175
    • 1990 Kawasaki kx500 – fresh top end
    • 1986 Honda ATC 350x
    • 1993 Honda CR250
    • 1979 suzuki rm400
    • 1986 Honda XR600r
    • 1988 Honda CR500 – Matt keeping (for now)
    • 1983 Honda cr60
    • 1993 Yamaha wr500z
    • 1983 Yamaha PW50 – 2nd owner from new
    • 1995 Kawasaki kx500 – raced in AMA nationals 1997
    • 1989 Yamaha YZ250 with missing head & Barrel
    • 1982 Honda CR125
    • 1986 Yamaha YZ250
    • 1969 Honda cl350 scrambler
    • 1994 Honda CR250
    • 1980 Can Am Mx-6 400
    • 1985 Honda CR500 rolling chassis
    • 1984 Honda z50r
    • 1994 Honda CR250r seized motor
    • 2x Honda 185 Atc’s
    • 1980 Yamaha IT250
    • 1983 Honda cr60 running bike
    • 1989 Honda CR250
    • Honda z50a
    • Husqvarna 390 OR – stuck motor
    • 1989 Suzuki RMX250
    • 1964 Yamaha YG-T 80cc trailmaster
    • 1970 Boyd & Stellings Kawasaki Big Horn
    • 1978 Yamaha yz400e – good compression but needs new detent spring
    • 1980 suzuki rm50t
    • 1985 Yamaha yz250n
    • 1992 Kawasaki KX250
    • 1974 Honda MR50
    • 1984 Honda Cr500
    • 1982 suzuki rm60z – runs & rides
    • 1978 Yamaha yz400e – good compression but needs new detent spring
    • 1986 Yamaha yz250s – nice seat good compression
    • 1977 Husqvarna 360 auto
    • 1982 Honda ATC 250r bike conversion
    • 1971 Honda SL100 trail bike
    • 1978 Honda CB125
    • 2x Honda ct105’s
    • 1985 Suzuki RM125
    • 1970 Indian mm5a mini bike!!
    • 1988 Honda CR500 – Matt keeping (for now)
    • 1973 Yamaha mx360
    • 1974 Yamaha sc500 – rolling chassi & bottom end
    • 1980 Honda ct70
    • 1990 Kawasaki KX250 – needs new tank
    • 1987 Kawasaki KX250
    • 1987 Yamaha YZ490T
    • 1986 Honda cr500 with Ali clutch cover upgrade
    • 1995 Kawasaki kx500
    • 1983 Yamaha YZ250K
    • 1982 Yamaha YZ490j
    • 1993 Honda CR250
    • 1987 Honda CR500 with ali clutch cover upgrade
    • 1983 Honda CR480 – 1 owner from new
    • 1974 Honda QA50
    • 1988 Honda cr250 good compression
    • 1983 Husqvarna 500cr
    • 1985 Husqvarna 250WR
    • 1987 Kawasaki KX500
    • 1994 Honda CRE260
    • 1984 Kawasaki KX125
    • 1987 Honda TLR 200
    • 1988 Yamaha YZ250
    • 1979 Honda CR250 running bike C3/51
    • 1974 Suzuki RL250 trials bike
    • Montesa Cappra 250
    • Bultaco frontera?
    • 1976 KTM 250
    • 1986 Honda z50r Christmas edition
    • 1991 Kawasaki kx125
    • Bultaco Sherpa parts bike
    • 1987 Kawasaki KX250
    • 1984 Honda CR125
    • 1984 Honda CR125
    • 1979 Yamaha yz250f running bike
    • 1996 Kawasaki KDX 200
    • 1984 Suzuki RM500
    • 1980 Suzuki RM125
    • 1977 Suzuki RM80b
    • 1982 suzuki RM80
    • 1987 Honda XR250
    • 1983 KTM 250
    • 1989 Kawasaki KX125 – needs top end rebuild
    • 1985 Honda CR500
    • 1979 Honda CR125
    • 1992 Yamaha yz250
    • 1985 Yamaha yz490n
    • 1986 Yz490 good running bike
    • 1989 KTM 300 MXC
    • 1973 Honda XL250
    • 1996 Kawasaki kx250
    • 1987 Yamaha yz125
    • 1988 Kawasaki KX250
    • 1979 Honda CR250 parts bike
    • 1986 Honda CR250
    • 1972 Yamaha rd350
    • 1996 CCM c25 604 Rotax unrestored
    • 1983 Honda CR60 – needs top end rebuild
    • 1967 Harley Davidson 350 sprint
    • 1978 Honda CR125m
    • 1989 Honda CR500
    • 1983 Honda CR480
    • 1984 Honda CR500 1 owner from new C4/47
    • 1980 Yamaha YZ465
    • 1992 Yamaha yz250
    • 1987 Yamaha yz250 running bike
    • 1983 Honda CR480 running bike
    • 1978 Maico mc400 Magnum
    • 1979 Honda CR250 Red Rocket C4/50
    • 1966 Honda CT90 K0 C4/42
    • 1988 Honda CR125
    • 2x Cr480 twin shock projects
    • 1969 Bridgestone 100cc needs tank & seat
    • 1987 Kawasaki KX250 c4/38
    • 1989 KTM 500 MXC C4/53
    • 1992 Honda CR250
    • Lovely 1983 Honda CR480
    • 1979 Honda CR250 Red Rocket C4/50
    • 1965 Honda CT200s C4/41
    • 1996 Honda CR250 C4/45
    • 2000 Yamaha YZ250
    • 1986 Yamaha YZ125
    • 1990 KTM 250 MX – 1 owner from new C4/43
    • 1987 Kawasaki KX250 c4/38
    • 1997 Honda CR500af C4/46
    • 1972 Bultaco Pursang 350
    • 1980 Kawasaki KX80 C4/51
    • 70’s Kawasaki KE125 flat tracker
    • 1981 Yamaha IT125
    • 1994 KTM 550 MXC
    • 1986 Honda TLR 200
    • 1987 Honda CR125
    • 1978 Suzuki RM125c
    • 1970 Honda QA50 k0
    • 1975 Husqvarna 250 CR GP project bike c4/39
    • 1983 Honda ATC250R
    • 1977 Honda CR125m
    • 1979 Yamaha yz250 running bike
    • 1985 Kawasaki KX125
    • 1977 Yamaha YZ125 C4/52
    • 1979 Suzuki RM125n
    • 1979 Yamaha Yz250f DG
    • 1984 Suzuki RM250
    • 1988 Suzuki RM250 low compression
    • 1987 Kawasaki kx125 low compression
    • 1993 Kawasaki KX125
    • 1985 Kawasaki KX250 needs plastics
    • 1981 Husqvarna 250CR
    • 2000 Yamaha PW50
    • 1982 Honda ATC 185s
    • 2000 Honda CR125 C4/44
    • 1980 Yamaha YZ465 C5
    • 1987 Husqvarna 430CR c5/33
    • 1986 Yamaha YZ490s c5/29
    • 1986 Yamaha YZ490 project bike c5/50
    • 1992 Yamaha WR500z c5/26
    • 1999 Kawasaki KX125
    • 1989 Yamaha YZ360 Ohlins
    • 1981 Yamaha IT250 c5/37
    • 1988 Yamaha YZ250 C4/40
    • 1987 Honda CR250
    • 1985 Honda CR500
    • 1976 Honda MR250
    • 1980 Yamaha YZ250g c5/53
    • 1987 Honda CR125
    • 1980 Kawasaki KX125
    • 1978 Yamaha IT175e
    • 1984 Yamaha YZ250 C5/67
    • 1987 Husqvarna 400WR
    • 1980 Suzuki RS250t c5/55
    • 1995 Honda CR250
    • 1977 Kawasaki KM100 c5/58
    • 1984 Honda CR250 c5/27
    • 1968 Greeves Challenger MX5 250 c5/69
    • 1989 KTM 500MX c5/36
    • 1987 Yamaha YZ490
    • 1983 Suzuki RM250 c5/34
    • 1994 Honda CR80 c5/52
    • 1997 Honda CR250
    • 1988 Kawasaki KX250
    • 1985 Honda CR250 stuck motor
    • 1989 Honda CR250 c5/41
    • 1977 Suzuki RM125b
    • 1979 Honda CR125
    • 1979 Honda CR125 c5/24
    • 1989 Suzuki RM250 c5/66
    • Yamaha IT400 C5/61
    • Green 1970 Honda QA50 K0 – Phoenix motos new pit bike
    • Honda QA50 c5/35
    • 1988 Kawasaki KX500 C5/30
    • 1986 Yamaha YZ250s c5/45
    • 1975 Yamaha MX125
    • 1979 Honda CR250 Red Rocket C4/50
    • 1995 Yamaha YZ250
    • 1980 Yamaha YZ400g c5/59
    • 1984 Kawasaki KX500 c5/65
    • 1994 Yamaha YZ125 c5/43
    • 1994 Yamaha YZ250
    • 1979 Can Am Qualifier 370 – stuck motor
    • 1974 Yamaha 250 MX c5/60
    • 1979 KDX250 A1 c5/32
    • 1970 Ossa 250 Explorer
    • Kawasaki kx500af 08 kx450f with 99 kx500af motor – needs top end
    • 2009 Honda CR450r rolling chassis
    • Triumph Tiger Cub C5/68
    • 1974 Honda XL175 c5/12
    • 1987 Yamaha YZ250T c5/51
    • 1990 Kawasaki Kx250
    • 1985 Honda ATC 200x
    • 1986 Kawasaki KX250 C6/27
    • 1979 Kawasaki KX80 C6/5
    • 1986 Yamaha YZ490 C6/6
    • 1987 Yamaha YZ80 c6/18
    • 1983 Yamaha IT490
    • 1983 Yamaha YZ490 c6/32
    • 1994 Honda CR125 c6/47
    • 1990 Honda CR250 c6/37
    • 1984 Honda CR500 c6/25
    • 1986 Yamaha YZ250 c6/20
    • 1982 Yamaha IT465 C6/9
    • 1988 Honda CR125 C6/11
    • 1977 Honda XR75 stuck motor c6/23
    • 1986 Yamaha YZ250s c6/36
  • Contact

I’m trying to impart all my knowledge so you can either be empowered to work on your own bike or so that you know if someone is pulling the wool over your eyes.

I’m trying to structure this in the most logical way I can.

The 2 stroke Cycle

Top end rebuilds

Why do a top end rebuild?

Disassembly

Inspecting the top & Bottom end

Parts needed & prep

Rebuild

  • Home
  • Bike Sales
  • Contact
  • Open Facebook in a new tab
  • Open Twitter in a new tab
  • Open Instagram in a new tab
  • Open YouTube in a new tab
© 2025  Phoenix Motos