Want To Turn TM 125 IN CR eater

[Dono113]

Read a thread which was dated awhile back on TM125 go fast tips, interested in making my 73 TM125 into a CR eater or close to, have a spare motor in case things go south , but I'm tired of chasing hondas any help would be excellent. I know youse have spoke of porting, changing CDI etc. just need to be pointed in right direction.
Thanks

[09.0]

Easiest way is to undo the filler cap and slide a cr125 under it! Sorry not helpful. I'm just a smart ass!
Methanol is the biggest increase in hp bar none if you are happy to play with that stuff. I even hate the idea of the high maintenance assossiated with it.

[John Orchard]

The only guy in Oz I saw get a TM125 going was Terry Bryant (R.I.P.) from Bryant Suzuki in Frankston, he built the bike for Jeff Beattie; twas a rocketship.  I wonder if Craig Jordon (Jordo) who was the apprentice then picked anything up?

Maybe slap in an RM125S engine?

I think those single-channel transfer ports were the limiting factor in those engines?

[TM BILL]

Dont think it will happen all things being equal, i tried everything short of bringing in a priest but they are limited  . As Brad said methanol will give a gain but lots of dramas  RM 125S motor great but not pre 75 legal  Lozza can probably port a TS cylinder for you ( they are a better starting point ) but if the other riders are of similar or better riding ability its a lost cause . 5 speed box is also limiting Crs are 6 speed , the fast Crs are on methanol and i found that on uphills they just run away . Davey crocket (Joan ) has built a fast reliable YZ 125A but its still a 5 speed  Vandys MX 125 is a good fast pre 75 125 but still a 5 speed .

Honestly learn to corner real fast and hope the tracks dont have too many long straights or uphills and you may be in with a shot . Otherwise buy an Elsinore or a KX 125  probably the only real contender to the Elsinore with stock motor and soooooooo easy to ride , sweet linear power and 6 speeds and they dont load up like an Elsinore    , you just have to work the suspension .  Rob Tumes from SA has had great succsess  on his KX at the nats in years gone by .

Tm is a great bike but a title contender  not unless your name is Akira Watanabe 

[huskibul]

   Or jens olsen ! back in the early 70's jens used to regularly beat top  A graders on elsinores on  TM's ,if you can untap his secrets your half way there 

[jimg1au]

this is what tm bill is talking about
last sunday pre90 125 dirt track 1st place brett chipperfield 1974 cr125.yes he is an a grader and yes it is his bike from new.
example 2
terry sayer(i think) 1977 cr125 runs on methenol reg 1st or 2nd evo 250 dirt track
jim

[Lozza]

Read a thread which was dated awhile back on TM125 go fast tips, interested in making my 73 TM125 into a CR eater or close to, have a spare motor in case things go south , but I'm tired of chasing hondas any help would be excellent. I know youse have spoke of porting, changing CDI etc. just need to be pointed in right direction.
Thanks

There are a few things to consider, the 5 sp is OK you just have to build the engine around it. Engine has limitations but there is nothing stopping you getting close to the CR in mx, dirt track is a bit different.
A TS cylinder is better starting point than a TM cylinder
TM ignition is woeful best swapped for a YZ80/100.
Use CR pistons.
In mx you will have a small window to get on top of CR's from mid corner to exit, if you can get good drive there your in with a chance.
No need for KX's Bill you can do it with a humble KH 125.

PM Brentj and he'll fill you in on some details.

[VMX247]

Read a thread which was dated awhile back on TM125 go fast tips, interested in making my 73 TM125 into a CR eater or close to, have a spare motor in case things go south , but I'm tired of chasing hondas any help would be excellent. I know youse have spoke of porting, changing CDI etc. just need to be pointed in right direction.
Thanks

What do you want to do,club days or win titles.?
A search on this forum is a great knowledge base.TM's can & do win titles.  

The little TM's may not have been the hottest ticket on the planet at the time but they were and still are one of the most reliable.

[bazza]

put a TM tank on a CR

[TM BILL]

Read a thread which was dated awhile back on TM125 go fast tips, interested in making my 73 TM125 into a CR eater or close to, have a spare motor in case things go south , but I'm tired of chasing hondas any help would be excellent. I know youse have spoke of porting, changing CDI etc. just need to be pointed in right direction.
Thanks

What do you want to do,club days or win titles.?
A search on this forum is a great knowledge base.TM's can & do win titles.  [/font]

The little TM's may not have been the hottest ticket on the planet at the time but they were and still are one of the most reliable.

Enlighten me do  when did a TM 125 win a vintage title ?? Doc got a very well earned 3rd at the Coffs titles  250s and 400s have won titles for sure although i believe in those cases it has been 90% rider 5% bike and 5% good fortune 

[TM BILL]

Read a thread which was dated awhile back on TM125 go fast tips, interested in making my 73 TM125 into a CR eater or close to, have a spare motor in case things go south , but I'm tired of chasing hondas any help would be excellent. I know youse have spoke of porting, changing CDI etc. just need to be pointed in right direction.
Thanks

There are a few things to consider, the 5 sp is OK you just have to build the engine around it. Engine has limitations but there is nothing stopping you getting close to the CR in mx, dirt track is a bit different.
A TS cylinder is better starting point than a TM cylinder
TM ignition is woeful best swapped for a YZ80/100.
Use CR pistons.
In mx you will have a small window to get on top of CR's from mid corner to exit, if you can get good drive there your in with a chance.
No need for KX's Bill you can do it with a humble KH 125.
PM Brentj and he'll fill you in on some details.

Do you fit knobblys to the KH Lozza  and do you run the std KH suspension 

[VMX247]

TM's can & do win titles.[/[/color]font]
Enlighten me do 

I didnt mention capacity ! 

The question was pretty open..How longs a piece of string and what money/time has he got to spend   

[Slakewell]

Ive herd of guys moving the barrel studs to fit another transfer port? Dave Tanner has a sweet one that I love the look of. 
The only thing better than a Honda is an Honda engine in a KTM frame 

[Graeme M]

What they all said...   

[Curly3]

I'm interested, as a kid I dreamed of having a TM125 and one day I will.
Carefull what you say Alison, everything has to be backed up with fact,