Looking to replace the TW forks...........
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Thread: Looking to replace the TW forks...........

  1. #1
    Senior Member Landser's Avatar
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    Looking to replace the TW forks...........

    I've been reading the various comments in past posts regarding possible alternate choices; pretty dismal IMO. However,that said,two of my riding chums are also vintage MX bike collectors/restorers,and became interested in my search to find more suspension travel. So,they are picking thru their individual collections of spare forks for me. The 'plus' here is that their period of MX interest spans from 1970 to 1990; when tube diameters were 'small' and 7-9" of travel was considered 'proper'..... Long story short,whatever they may come up with will be oceans better than what I have at the present.....
    I'll post again as this project develops....(or,caves in....lol).

  2. #2
    Senior Member JagLite's Avatar
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    Here is a nice list of fork tubes by size:
    » Motorcycle fork tube diameter list Organ Donor

    The TW has 33 mm tubes and there are few dirt bikes that use that size.

    The TW triple clamps could be bored to fit 34 mm which opens up a few mx possibilities but if the triple clamps can be bored to 35 mm that would really offer a lot of possible choices.
    I don't know how much the clamps can be opened up but a good machine shop (or 3) could give their opinion.
    James

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  3. #3
    Senior Member jtomelliott49's Avatar
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    Curious, what is the travel in stock form? It seems short to me. But then, I'm the guy who wants leading link forks. lol
    Tom in Wichita

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  5. #4
    Senior Member Borneo's Avatar
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    Yup, almost no bikes with 33mm tubes.

    33 Honda CR-80R (84)
    33 Honda CR-80R (85-86)
    33 Honda TLR-200 (86-87) "Reflex"
    33 Honda XL-200R (83-84)
    33 Honda CMX-250C (85-87, 96-04)
    33 Honda CMX-250C2 (99-00)
    33 Honda TL-250K "Trials 250" (75-76)
    33 Honda CB-350K "Twin" (68-74)
    33 Honda CB-350F/F1/G "Four" (72-74)
    33 Honda CL-350 "Scrambler 350" (72-73)
    33 Honda SL-350 K1 (70-71)
    33 Honda CB-360/T (75-76), CL-360K (74), CJ-360T (76-77)
    33 Honda CJ-360T (76-77)
    33 Honda CB-400A "Hondamatic" (78 )
    33 Honda CB-400A "Hondamatic" (78 )
    33 Honda CB-400T I & T II "Hawk" (78-79)
    33 Honda CB-400T (80 From 2004662 - 81)
    33 Honda CB-400T (80 To 2004661)
    33 Honda CM-400A "Hondamatic" (79-81)
    33 Honda CM-400T (79-81)
    33 Honda CM-400E (80-81)
    33 Honda CM-400T (79-80 To 2114344)
    33 Honda CB-450SC (82-86)
    33 Honda CM-450A/E (82-83)
    33 Honda CX-500 (78-79), CX-500C (79), CX-500D (79)
    33 Honda CX-500C "Custom" (80)
    33 Honda CX-500C "Custom" (80)
    33 Kawasaki KX-65A1-A5 (00-04)
    33 Kawasaki KX-80E1 (83)
    33 Kawasaki KX-80E2/E3 (84-85)
    33 Kawasaki KZ-305A1/A2 "CSR" (81-82)
    33 Kawasaki KZ-400A1/A2 "Deluxe" (77-78 )
    33 Kawasaki KZ-400C1 (78 )
    33 Kawasaki KZ-400H1 "Ltd" (79)
    33 Kawasaki KZ-440A1 "Ltd" (80)
    33 Kawasaki KZ-440A2-A4 "Ltd" (81-83)
    33 Kawasaki KZ-440D1 "Ltd" (80)
    33 Kawasaki KZ-440D2-D4 "Ltd" (81-83)
    33 Suzuki RM-65K3/K4 (03-04)
    33 Suzuki RM-80 G/H/J (86-88 )
    33 Suzuki GN-250 Z/D (82-83)
    33 Suzuki GS-250 TT/TX (80-81)
    33 Suzuki GT-250 K/L/M/A/B "Hustler" (73-77)
    33 Suzuki GS-300 LZ/LD (82-83)
    33 Suzuki GT-380 J/K "Sebring" (72-73)
    33 Suzuki GT-380 L/M/A/B "Sebring" (74-77)
    33 Suzuki GS-400 B/XB (77)
    33 Suzuki GS-400 C/XC (78 )
    33 Suzuki GS-425 N/EN (79)
    33 Suzuki GS-450 ET/ST/EX/SX/EZ/ED (80-83)
    33 Suzuki GS-450 GAZ/GAD (82-83)
    33 Suzuki GS-450 LT/LX/LZ (80-82)
    33 Suzuki GS-450 TX/TZ/TXZ/TXD(81-83)
    33 Yamaha YZ-80 K/L/N/S/T/U/W/A/B/D (83-92)
    33 Yamaha BW-200 ES/ET/EU (86-88 )
    33 Yamaha TW-200 T/TC/U/UC/W/WC/A/AC/B/BC/D/DC/E/EC "Trailway"
    (87-93)
    33 Yamaha TW-200 F/FC/G/GC/H/HC/J/JC/EK/EKC "Trailway"
    (94-98 )
    33 Yamaha TW-200 L/LC/M/MC/N/NC/P/PC/R/RC/S/SC (99-04)
    33 Yamaha SRX-250 T/TC (87)
    33 Yamaha XV-250 U/UC/W/WC/A/AC (88-90)
    33 Yamaha XV-250 G/GC/H/HC/J/JC/K/KC/L/LC (95-99)
    33 Yamaha BW-350 U (88 )
    33 Yamaha XS-360 C/D/2D (76-77)
    33 Yamaha XS-400 D/E/2E/F/2F/G/H (77-81)
    33 Yamaha XS-400 SG/SH (80-81)
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  6. #5
    Senior Member Devils Advocate's Avatar
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    Yep, that's a few.

    Not all those are dirt bikes though.

  7. #6
    Senior Member JagLite's Avatar
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    Quote Originally Posted by Borneo View Post
    Yup, almost no bikes with 33mm tubes.

    33 Honda CR-80R (84)
    33 Honda CR-80R (85-86)

    33 Honda XL-200R (83-84)

    33 Kawasaki KX-80E1 (83)
    33 Kawasaki KX-80E2/E3 (84-85)

    33 Suzuki RM-80 G/H/J (86-88 )

    33 Yamaha YZ-80 K/L/N/S/T/U/W/A/B/D (83-92)
    Since the reason to replace the forks was to install better suspension I discounted street bikes.
    The Honda XL may be an improvement...
    But I wouldn't bother with them.

    Really the old CR, YZ, KX, and RM are the only candidates.

    I am using RM 85 forks (2005 USD) on my XR200 because they are a huge improvement.
    James

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  8. #7
    Senior Member Landser's Avatar
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    "...Really the old CR, YZ, KX, and RM are the only candidates...."
    They're certainly the most obvious candidates.....Going back to the mid-70's MX models such as the YZ 125 and similar.There are other possibilities from 'back then',such as Betor(Bul/Ossa),Marzocchi,Ceriani,etc. Many of the "serious" forks were 35mm diameter,but it looks to me that the TW triple clamps can be enlarged to that dimension if need be.

    Unfortunately, there are discrepancies between the stated factory specifications and the those found on the published lists of forks by diameter,but the lists are helpful nonetheless because they provide the basis from which to research the fork a bit further.
    Last edited by Landser; 10-25-2015 at 07:29 AM.

  9. #8
    Senior Member Landser's Avatar
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    Some progress....early Suzuki RM 80's used both 32 and 33mm tubes. I have a set of 1974 Yamaha MX250 forks-34mm- now also. I read lizrdbrth (sp) old post about his use of RM80 tubes w/ TW lowers resulting in an increased overall fork length but no increase in fork travel.....I'm left to wonder why he didn't use the entire RM80 assembly........axle diameter difference perhaps?

  10. #9
    Senior Member Gerry's Avatar
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    Had my stock triple-tree bored to 34mm and went with the early model Yamaha Tri-Z fork. Kind of a fringy experiment, but it has worked out great for me. I would not feel comfortable boring to 35mm.

    Tiny Wheel, a forum member in Alaska installed the complete front end of the Tri-Z trike on his TW.
    Last edited by Gerry; 11-06-2015 at 09:08 AM.
    Landser and Old n dirty like this.
    Take care my Friend.........

  11. #10
    Senior Member Landser's Avatar
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    "....early model Yamaha Tri-Z fork..."

    I presume that you used a pre-85 set......I believe that 86 on were larger....Looks great. What is the 'travel' with these forks? I won't enlarge the clamps beyond 34mm.....

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