BRIDGESTONE 200 ENGINE

[reed]

Bridgestone 200 engine.
I have a Bridgestone 200 in for engine work.
So i had some time and i started  the disassembly
Today,Split the crankcases and pulled the crankshaft
Out and you can clearly see the centre seal start to
Disintegrate.
Thanks.
Steve.

[reed]

This a picture of the crankshaft etc.
These engines are well made.
Thanks.
Steve.

[Sno Jet]

Keep the pictures coming on that 200.   Good stuff.  Steve, what symptoms was that 200 showing that helped you determine the crank was faulty? 

[reed]

Harry,
The Bridgestone was a bad starter it had new points timing set, carbs cleaned, good compression,
So i did a two stroke leak down test and that how i determine that the main seal was gone.
It was leaking past the seal, and air leak can cause a lean condition in the engine fuel- air
Mixture and result in the engine overheating piston seizure detonation etc.
In all the crankshaft is in good condition its just the main seal i will put a new crankshaft in.
The old crankshaft at some stage i will replace the seal.
Thanks.
Steve.

[reed]

This is the picture of my two-stroke leak down tester.
Its a neat tester.
Thanks.
Steve.

[reed]

This is a picture of the new Bridgestone crankshaft with new outside bearings.
All set to go into the crankcase etc.
Thanks.
Steve.

[reed]

I have cleaned the crankcases and inspected the gearbox ready for the crankshaft to go in.
Thanks.
Steve.

[BSOrion]

Steve,

Looks great and it's apparent how thorough you are with these bikes.  Keep up the great work.

Orion

[reed]

BSOrion,
Top end is next, new pistons and rings plus clips and small end bearings etc.
Thanks.
Steve.

[stickman]

Reed
you make it look so easy
Bob

[reed]

The Bridgestone 200 engine.
I have put the new crankshaft in and re sealed the crankcases.
Rotary valves fitted and timed etc.
New pistons and rings cir clips plus small end bearings are on the
Way from Richard.
Thanks.
Steve.
 

[reed]

The clutch holding tool a special tool from Bridgestone.
It locks up the clutch so you can remove the retaining nut.
Which is a left hand thread, in the picture i am reassembling
The clutch etc.
Thanks.
Steve.
PS i put the clutch holding tool over the kick start shaft then
I fit the kick starter so it holds the tool in place so it wont slip.

[reed]

The clutch holding tool from Bridgestone.
I have the dealer set for all the models.
And the ones i have used up to now have
Worked great.
Thanks.
Steve 

[reed]

This picture shows the new con rods ready for the pistons.
Its a very neat engine.
Thanks.
Steve.

[rocketman]

  Steve, it sure is nice to have the right tools for the job. Looks great.  Mark.

[reed]

Mark,
That breaker bar from snap on is about 30 years old!!
Its had some use.
Thanks.
Steve.

[Mopar5426]

  Reed   Do You Have The Eguipment For Disasembly Of The Crank   And For Timing It And Pressing It Back Together   GENE

[Sno Jet]

Looks like it is coming along great.  Good job.

[reed]

Gene,
Yes i have the equipment to press the crankshaft apart, and set it up and press it back together.
Thanks.
Steve. 

[BSOrion]

Steve,

Looks like forward progress and a very tidy and neat assembly process.  Do you have any theories as to why the center seal failed (age and lack of use, improper parts/assembly, etc.)?

BSO-