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Discussion Starter · #1 ·
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).
 

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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.
 

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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
 

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Yup, almost no bikes with 33mm tubes. :D

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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Yep, that's a few.

Not all those are dirt bikes though.
 

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Yup, almost no bikes with 33mm tubes. :D

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.
 

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Discussion Starter · #7 · (Edited)
"...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.
 

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Discussion Starter · #8 ·
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?
 

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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.
 

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Discussion Starter · #10 ·
"....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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I believe you are correct regarding the year. I purchased the forks on a whim, but had first asked the seller to measure the diameter (34mm). Upon taking the forks to my local Yamaha dealer to buy seals and such, I was told these were an earlier year. The extra travel is notable but I can not provide a number. You may do a spec search on 1986 Yamaha Tri-Z. Gerry


 

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Discussion Starter · #12 · (Edited)
Progress---
I now have both a set of '74 and '75 CR125 forks,which I've disassembled and measured. These units re 31mm;and I'd rather fab flanged sleeves than bore triple clamps. I'm awaiting the arrival of another pair of CR125 forks,these being 1976 'M' model units,a bit longer with a total travel of 7.9". I plan to use the '76 model units...... Regarding the flanged sleeves,these will be of one piece split type and likely of brass material for a bit more grip(to the hard chrome tubes). These will install from the bottom of the clamp,with the top pair having an internal flange to limit the upward movement of the fork tube should the clamp bolts loosen.
 
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