'75 Six Day

[brian kirby]

Anybody know what the rear travel is on that bike with the stock length shocks in the lowest frame position? Thats the one with the single lower mount back by the axle and the three frame mounts.

Also, are there any 100 liners out there? And, would it be possible to put a 100 liner in a 125 D cylinder? By eye, the alloy parts of the cylinders look the same, only the 100 uses a thicker liner but I could be wrong.

Brian

[checkcrew]

Brian

if you look in the featured bikes section you will see a 75 Six-Days,
there is only one lower shock mount on the swingarm and the shocks look to be 13.5"

as for the cyl i am to understand you "can not" put a 100 liner in a 125 cyl,
check with Forrest Stahl but that is what i am to believe,
maybe some one else can confirm this

hope this helps,

EDIT : i just measured a 125 "D" liner that is in a B cyl. that i have against a stock 100 cyl,
the "OD" on the 125 liner is 60mm and the 100 liner is 56mm,
"IMO" there is NO poss. way to install a 100 liner in a 125 cyl.

again i hope this info helps
 
regards,

Mike Gallagher, NJ.
[email protected]

[tomale]

I wonder if a 100cc liner could be made, We have a guy up here in the northwest who probably could do it.. Superior sleeve..888.700.5839

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
74'250 hare scrambler (project)
74' 1/2 440 maico
78' 440 maico
72' cr125 Husky (project)
74' TM125 suzuki
93' RMx 250 suzuki

[rob w]

quote:Originally posted by brian kirby

Anybody know what the rear travel is on that bike with the stock length shocks in the lowest frame position? Thats the one with the single lower mount back by the axle and the three frame mounts.
Brian

Brian, I will get back to you on that tomorrow.

[joe novak]

Of course, a 100cc D engine can be made.   A liner with the correct I.D. of 48mm, and correct O.D. to be installed into the 125cc cylinder.  It is likely that this special order or special built liner will need the ports to be cut out.   I have seen liners like this in the past...  just need to get out the grinder and cut the port openings to match the port specs.   joe

[Bob Bean]

Kustom Kraft has made custom liners in the past.

Bob Bean

1986 ISDE Italy
1987 ISDE Poland
1989 ISDE Germany

1973 Jackpiner 175
1974 Penton 250 Harescrambler
1976 Husky 250CR
1985 Husky 400WRX
1985 Husky 400WR

[Larry Perkins]

Am I missing something here?  Why not bolt a 100 topend on the 125 bottomend?  Sounds a whole lot easier.  

Another question is what can you do with a longer travel 100?  AHRMA does not offer it and AMA has dropped it.  Some local VMX areas offer it and the Marty Tripes "Let's a bunch of us cheat" Series has it but there you might as well leave it a 125 and call it a 100.

Larry P

[brian kirby]

quote:Originally posted by Larry Perkins

Another question is what can you do with a longer travel 100?  AHRMA does not offer it and AMA has dropped it.  Some local VMX areas offer it and the Marty Tripes "Let's a bunch of us cheat" Series has it but there you might as well leave it a 125 and call it a 100.

Larry P

I'm going to build one for the Marty Tripes races. I'll build it as a 100, if someone beats me it wont be because they have too big an engine, it will be because they outrode me.

Brian

[Larry Perkins]

Brian,

So if you are beat by a 125 2 stroke or a 200 four stroke it is only because they outrode you[?]  Brian, Brian.  We have found another point to differ on.[)]

Larry P

[SouthRider]

I agree with Brian. It sounds like he wants to build a legal bike for the race. He can't control what others do.....

Go for it Brian. I think you can be competetive with them. It isn't always about horsepower.

[brian kirby]

quote:Originally posted by Larry Perkins

Brian,

So if you are beat by a 125 2 stroke or a 200 four stroke it is only because they outrode you[?]  Brian, Brian.  We have found another point to differ on.[)]

Larry P

I should rephrase that. I am going to build a legal bike, and if I get beat by someone because they have a little extra somewhere, I dont care. When I get beat, virtually 100% of the time, I can honestly say it was because the rider was faster than me, I cant remember the last time I got beat and thought it was because they had a better bike.

Plus, even if they have a little extra, from the photos I've seen, those Marty Tripes 100 guys will need some extra CCs to get their power to weight ratio to where mine is.

Brian

[Dwight Rudder]

Brian, You can't use a 1975 frame for Sportsman Vintage. It is illegal. It is more than just a swingarm change. It is an entirely differnt frame design.  So just getting the travel right is not legal. It will be still in the Post Vintage Historic Class.  If you want to build a 100/6D that is not the problem. It is the frame is a long travel frame.  I am surprise you weren't protested with your other bike with the modified swingarm. Rules state you must mount the shock in the middle hole on the CMF frame swingarm . Yours is moved way forward of that.
Just say'n,
Dwight

[gooddirt]

You can run any hole you want as long as your rear wheel travel is 4 inchs. What page did you see that rule? Never seen or heard of such. Have also seen a 1975 run in the classic class, under like design .

[rob w]

quote:Originally posted by brian kirby

Anybody know what the rear travel is on that bike with the stock length shocks in the lowest frame position? Thats the one with the single lower mount back by the axle and the three frame mounts.

- OEM '74 1/2 & '75 Ceriani/Corte & Cosso
13 3/8" long
Shaft travel , 3  5/16"
Rear wheel travel = 5"

- 2003 Works Performance
13 1/2" long
Shaft travel , 2  3/4"
Rear wheel travel = 4"

- 1975 Gas Girlings (these came on '75 Six-Day I bought)
13 3/8" long
Shaft travel , 4  3/16"
Rear wheel travel = 6  1/4"

Bob

[Dwight Rudder]

quote:Originally posted by gooddirt

You can run any hole you want as long as your rear wheel travel is 4 inchs. What page did you see that rule? Never seen or heard of such. Have also seen a 1975 run in the classic class, under like design .

I can no longer find that rule with regards to the Penton swingarm about mounting in middle hole. There used to be one.  As for the 1975 frame is it different.  It is not of like design. Only the engine is similar.  If you want to use that excuse then why not run a Husky 175GP in the Sportsman class. The engine is of like design although the the frame is quite different.

11.1 CLASSES AND ELIGIBILITY
These classes are intended for model year 1974 and like machines that are essentially unchanged.
Other 1975-model motorcycles are not eligible.

NOTE: Like-design Sportsman machines:
a) 1975 Maicos are not legal for AHRMA vintage competition, although the 1975
frame may be used as a replacement for the 19741/2 GP models. The '741/2 fork
assembly, swingarm, hubs and engine must be retained. Any and all 1975 models
must meet the 7-inch-front/4-inch-rear wheel suspension travel requirement measured
at the axle.
b) 1975 Bultaco model 134-136, 143 and 144 frames may be used as replacement
frames in Sportsman. Swingarm must be pre-1974, 4-inch travel.
The Sportsman eligibility list is now complete with regard to non-like-design post-
1974 machines. However, proposals for inclusion of like-design machines are always
welcome.

m) No major components may be later than 1974 (i.e., frame, forks, engine, gearbox,
wheels, etc.) (This should also include ribbed Ceriani forks as they were not available till late 1975)

12.1.2 Historic 125: Certain 88-125cc machines built up to and including the 1977 model year
that made up the first generation long-travel, small bore motorcycles. Eligible machines
include:
1975-77 Bultaco Pursang 125
1975-77 Can-Am TNT, Qualifier and MX 125, up to MX3 (MX4 and later see Gran
Prix classes)
1975-78 CZ 125
1975-78 Honda CR, MR, MT 125
1975-77 Husqvarna CR, WR 125
1975-77 Kawasaki KX, KE, KD 125
1975-77 Maico 125 GP
1975-77 Montesa Cappra 125 VA & Enduro 125. VB, 1977 & 1978 models only; no
later-model components, including swingarm.
1975-77 Penton/KTM 125 with Sachs or KTM engine. (1978 Penton/KTM is
================================================
not a like-design model. See GP classes.)
1975-77 Suzuki RM, TM, 125
1975-77 Yamaha MX, YZ, DT, 125
1978 Kawasaki KX125 A4