OzVMX Forum

Clubroom => Foto Forum => Topic started by: Jumbo J on July 13, 2014, 10:21:24 am

Title: My TM250 Project
Post by: Jumbo J on July 13, 2014, 10:21:24 am

(http://i1274.photobucket.com/albums/y432/jrhx/TM/017_zps00a2f636.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/017_zps00a2f636.jpg.html)
(http://i1274.photobucket.com/albums/y432/jrhx/TM/container1_zps889929f7.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/container1_zps889929f7.jpg.html)
 

Picked up this original TM250M on ebay about 18months ago from Detroit. Arranged trucking it to New Jersey (uship) and then shipping it to Sydney myself, Customs clearance Quarantine etc. Good learning experience. Plan is to prepare it for the track over time, starting with rebuilding the suspension and replacing all the worn out or perished bits after 40 years of sitting around. Looks to me like the engine has never been split and except for missing the front race plate, nothing has been removed or replaced on the bike since it was new. Will probably save the original (made in japan) cosmetics like tank, guards, side plates etc. and replace them with aftermarket or good 2nd hand gear to protect their remarkable condition for age.

It is a 75 model so i will ultimately source an unmolested straight 74 frame and swing arm to transfer the running gear across to. Haven't got a race licence or joined a club yet, but will be doing that when it gets closer to the point i would like it to be before hitting the track.

Will post more pic's here as i progress through the rebuild journey   

Title: Re: My TM250 Project
Post by: DJRacing on July 13, 2014, 10:26:00 am

Certainly a good score, good luck with the project.

Title: Re: My TM250 Project
Post by: Ktm181 on July 13, 2014, 11:15:10 am

very nice tidy old girl too by the looks of it, one of my all time favourite dirt bikes (TM & RM), AND you did the effort yourself, well done!  Make it reliable and RIDE the sucker!

Kt.

Title: Re: My TM250 Project
Post by: Jumbo J on August 17, 2014, 05:09:01 pm

Fitted today new cush drive rubbers, brake shoes, fr and r sprokets
(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140810_141331_resized_3_zpsd49a0a86.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140810_141331_resized_3_zpsd49a0a86.jpg.html)

(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140810_140029_resized_3_zps7157214d.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140810_140029_resized_3_zps7157214d.jpg.html)

(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140809_122521_resized_zpsa6cf7990.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140809_122521_resized_zpsa6cf7990.jpg.html)

(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140810_150916_resized_3_zpse9b31f34.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140810_150916_resized_3_zpse9b31f34.jpg.html)

new swing arm bushes
(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140816_143354_zps692749b7.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140816_143354_zps692749b7.jpg.html)

(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140817_164913_resized_1_zpsf9695ca0.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140817_164913_resized_1_zpsf9695ca0.jpg.html)

Title: Re: My TM250 Project
Post by: oldfart on August 17, 2014, 05:21:59 pm

Put a shim between circlip  & drive hub to take side play out of the equation . It's also a good idea to replace sprocket mount bolts as they have a tendency to shear off as have been down this path  ::)
Put a grease nipple in your swing arm and those bronze bushes will last for ever ;)

It's looking good .

Title: Re: My TM250 Project
Post by: Jumbo J on August 17, 2014, 06:23:20 pm

Thanks OF.i shimmed the cush drive rubbers there was a lot of b and fwd play there despite them being new. Now it's solid as. Yes there is some slop between hub and circlip   but I haven't yet worked put what to shim it with. And already done the grease nipple and machined galleries in the pivot shims and bronze bushes. 

What would be a good choice of tyres. They are original and shot.

Title: Re: My TM250 Project
Post by: oldfart on August 17, 2014, 06:50:50 pm

I made my shim out of a M & F reducing ( steel ) bush turned down in me lathe. ;D
Lasted 3 seasons so far without any play.
I'm presently running  Metzeler  MC 5 ( intermediate) and they seem to wearing  well.

Title: Re: My TM250 Project
Post by: Jumbo J on August 17, 2014, 08:12:35 pm

Quote from: oldfart on August 17, 2014, 06:50:50 pm

I made my shim out of a M & F reducing ( steel ) bush turned down in me lathe. ;D
Lasted 3 seasons so far without any play.
I'm presently running  Metzeler  MC 5 ( intermediate) and they seem to wearing  well.

(http://i1274.photobucket.com/albums/y432/jrhx/TM/20140817_195454_resized_zps47f9ff56.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM/20140817_195454_resized_zps47f9ff56.jpg.html)

just checked the clearance gap, its barely 12 thou probably closer to 10, thats a bloody thin shim to spin up. doubt if my guy is set up for precision like that.
thx for the tip on the MC5's will chase down a set.

Title: Re: My TM250 Project
Post by: oldyzman on August 17, 2014, 09:20:29 pm

Mate, can't you just pack some thing under the cush drives before you put them in the hub, when i fitted a 520 chain and sprockets to my TM, i had a similar problem.

Title: Re: My TM250 Project
Post by: Jumbo J on January 05, 2015, 09:10:00 am

Well its been a while with other things distracting me, but here is the current state of the TM. But alas no spark, so after checking coil / plug lead/ cap. etc bought a NOS CDI unit to see if that cures it. Not sure how to check the CDI - any suggestions?

(http://i1274.photobucket.com/albums/y432/jrhx/TM1/20141224_143230_zps887ece6c.jpg) (http://s1274.photobucket.com/user/jrhx/media/TM1/20141224_143230_zps887ece6c.jpg.html)

Title: Re: My TM250 Project
Post by: shelpi on January 05, 2015, 10:31:28 am

get a good manual, it will have all the resistance values and stuff for each component, not to mention all the other specifications for servicable tolerances, good work mate, itsa pearla  ;)

Title: Re: My TM250 Project
Post by: oldfart on January 05, 2015, 01:26:59 pm

You will need a 50 tooth on the rear as the stock STD  are good for  Land Sped records  ;D

Title: Re: My TM250 Project
Post by: bazza on January 05, 2015, 01:58:50 pm

Looks good Stew, Happy new year

Title: Re: My TM250 Project
Post by: Jumbo J on January 05, 2015, 03:58:38 pm

Quote from: oldfart on January 05, 2015, 01:26:59 pm

You will need a 50 tooth on the rear as the stock STD  are good for  Land Sped records  ;D

Could only find a 42 / 520 rear Stew. (DR370)  with a 12T on the front. would prefer a larger rear if i could find one to fit the hub

Title: Re: My TM250 Project
Post by: oldfart on January 05, 2015, 04:48:49 pm

Give Titmans a call  they should have mine stored in a computer
Aluminium blank drilled to suit.... end result  ;D
(http://i72.photobucket.com/albums/i180/mutchoo/002-8.jpg) (http://s72.photobucket.com/user/mutchoo/media/002-8.jpg.html)

Title: Re: My TM250 Project
Post by: Jumbo J on January 05, 2015, 07:24:02 pm

cool will do. gotta a pic of the rest of the bike?

Title: Re: My TM250 Project
Post by: oldfart on January 05, 2015, 08:10:17 pm

(http://i72.photobucket.com/albums/i180/mutchoo/001-6.jpg) (http://s72.photobucket.com/user/mutchoo/media/001-6.jpg.html)

Title: Re: My TM250 Project
Post by: oldyzman on January 05, 2015, 08:14:01 pm

My rear sprocket is a 46 its off some sort of dr250 i believe.... Will see if i have a part number

Title: Re: My TM250 Project
Post by: oldfart on January 05, 2015, 11:09:38 pm

Looks like you have been shopping at Mr Millers  ;).

The newer style fits also

Title: Re: My TM250 Project
Post by: Jumbo J on January 09, 2015, 08:59:01 pm

no joy with the NOS CDI unit, spark still weak, new (superceeded) coil next step i guess