Bridgestone Motorcycle Parts Discussion Board
Bridgestone Tech Talk => 50, 60, 90 & 100 Talk => Topic started by: reed on May 23, 2012, 07:00:05 PM
-
Bridgestone 100 TMX.
I was going to replace the kick start shaft in my 90 sport.
But i think its time to replace the left crankcase that got
Damage on the TMX,and get the motor running right!
Thanks.
Steve.
-
Bridgestone 100 TMX.
This is a picture of the new crankcase and the side cover.
The damage was done before i had the motorcycle i think
At one time the chain came off etc.
Thanks.
Steve.
-
The Bridgestone has very little miles on it.
And i can not wait to ride it around.
Thanks.
Steve.
-
One more picture of the Bridgestone before i remove the engine etc.
Thanks.
Steve.
-
Bridgestone 100 TMX 1971.
Its time to work on my Bridgestone TMX 100.
With some of my work commitments out of
The way, i pulled the engine out of the frame.
So this week i will pull the engine apart and
I think new crankcase is in order along with
New mains and crankshaft seals and check
Out the top end etc.
Thanks.
Steve.
-
Hi Steve,
-
Hi Steve,
We just got home from our mission. Looks like you are making great progress as usual on the TMX. I am anxious to get started on mine. Another project, that's all I need. Talk soon.
Later Mike
-
I pulled the TMX engine apart today it needs new crank seals and bearings.
Richard has new piston and rings in stock and i think i will replace the clutch
Plates they have a hard life in small engines same goes for pistons and rings
Etc,i will say this Bridgestone engines are well made, in the picture i am using
A puller to split the crankcases.
Thanks.
Steve.
-
This is a picture of the crankcase apart etc.
Thanks.
Steve.
-
Oil pump gear B part number 1552-5010 just starting to split as you can see in the picture.
Got that in time! :)
Thanks.
Steve.
-
The piston is in good shape the lower ring is stuck that's why the compression is low
Its not worth cleaning up the piston, the price for a new piston and rings is very reasonable.
And the bore is in condition, more parts from Richard!!
Thanks.
Steve.
-
If you are replacing points or crankshaft oil seal it would be a wise move to get the Bridgestone fly wheel puller.
I know you can make one, but this puller is well made and low cost to buy.
Thanks.
Steve.
-
The clutch plates are worn so i will be replacing in a set.
Most of the time if the rear shocks are worn you will need.
Clutch plates too much weight on the motorcycle or maybe
Doing jumps anyway time to order,the crankshaft big end
Bearing is in good shape and the con rod, its coming together.
Thanks.
Steve.
-
On the fly magneto i will be replacing points and condenser.
Check out how somebody wired the condenser i had no
Spark looks like to much heat applied to the condenser.
Thanks.
Steve.
-
Hi Steve,
Great pictures nothing like a good do it your self photo set to get you thru a rebuild. I will use these pictures when I am rebuilding my TMX. Thanks for all you do.
Later Mike
-
The piston is in good shape the lower ring is stuck that's why the compression is low
Its not worth cleaning up the piston, the price for a new piston and rings is very reasonable.
And the bore is in condition, more parts from Richard!!
Thanks.
Steve.
Save that old piston and rings. Richard has replacements reasonably priced now, but 20 years from now, when those are gone, people will be paying big bucks for salvageable used ones. ;D
-
Bridgestone TMX 100.
With other workshop commitments this is the stage i am at now with the TMX.
Crankcases back together new main bearings and seals etc.
Thanks.
Steve.
-
That split plastic oil pump gear is a little worrying. Is that a known fault with these bikes? When I restored my own TMX it had only done 516 miles from new so the gear was OK, but is it a good idea to take the cover off and check the gear occasionally.
Also, how about the 350 engine - that uses a similar plastic gear to drive the oil pump?
Graham
-
HI , disc valve , i have also done a tmx100 an the gear showed some split area in the gear , the bike had about 2100 miles , an a tmx i got for parts from mike was also starting to split , the taka i bought new in 72 , after a year of use i had to replace the clutch friction plates an while in there i noticed the gear was showing so stress at this point , , i think this was a weak point , thanks william
-
On the plastic oil pump gear subject, i think it would a good thing to check out the gear.
I have seen this on other models like Yamaha and Kawasaki with splits showing etc.
Thanks.
Steve.
-
The plastic oil pump gear arrived so i replaced the gear with a new one.
Thanks.
Steve.
-
On the old oil pump gear, i cut a slot in each side and it just came apart!
Its worth checking the oil pump gear etc.
Thanks.
Steve.
PS Richard has the oil pump gears in stock.
-
I have sent the cylinder and head to be vapour blasted.
But i have a new piston and rings to be fitted when the
The cylinder and head are back.
Thanks.
Steve.
The parts came from Richard he has plenty of pistons and seals and gaskets in stock.
-
Looks like progress Steve. I will need to check the gear on my TMX and probably my Taka. Looks like a weak link.
Thanks Mike
-
Back on the TMX 100 i have sent the cylinder and head to Rice Relics to be vapour blasted and its on its way back!!
I have been busy with soccer, i coach u10 its the last game tomorrow and then i will have more time to finish off the
Engine and every thing else i am up to in the workshop.
Thanks.
Steve.
-
Maybe its just the lighting Steve. Is the new pump drive gear made of a different material etc than the original? Thanks, Mark.
-
Thta's a good point, Rocketman. I remember that the BS90 DeLuxe that I owned back in the day (1970) had a brown fiber drive gear, not white plastic. I had sheared off the small casing drain screw (thinking it was a case retaining screw), and when I tried to rdrill out the stump to use an "Easy out" screw extractor, teh stumpwound itself right in against the pump gear and made a hell of a noise when I started the engine! My brother helped me to remove the case and investigate, and I remember the gear was brown fibre material, and one side of the teeth has been neatly machined away by the drain screw. I removed the stump of the screw and reassembled everything, and the bike survived for a further 2 years until I sold it. I'm not sure a plastic gear would have survived such treatment.
Presumably, a fibre type gear will always be more resistant to cracking, being a composite material. All of the 350 engines I have seen have had white plastic gears, but I can't for the life of me remember what type of gear my TMX has got. Looks like I'll taking the cover off to check!
-
I got the head and cylinder back from Rice Relics, so next step fit new piston and rings and on with the cylinder etc.
So next week i will put the engine back in the frame and fit the new down pipe, and run the engine.
Thanks.
Steve.
-
One more picture of the cylinder after being vapour blasted it takes off all the years grime.
Thanks.
Steve.