Author Topic: What's Next? 1965 Bridgestone Sport 90 Engine Seized  (Read 7823 times)

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Offline stingray68

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What's Next? 1965 Bridgestone Sport 90 Engine Seized
« on: May 09, 2016, 09:50:31 AM »
   I have finally freed the piston from the cylinder and removed the cylinder from the crankcase.  Unfortunately the engine is still locked up.  My question now is what to do from here.  I am looking for advice as to what to do next.  When I take the bike out of gear the drive sprocket spins freely, but when it is in gear it does not move nor does the kick start move the piston. Anyhow, thank you to everyone for your help and encouragement....Mike

Offline mqtsteve

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #1 on: May 10, 2016, 05:54:34 AM »
Mike,
Sounds like it needs a complete rebuild.  The transmission may have rusted if it was sitting without oil for a long period.  The kickstart mechanism may be broken/jammed?  Bearings could be shot?  Endless possibilities?  Good luck! Steve
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #2 on: May 10, 2016, 08:01:17 AM »
That's kind of what I am afraid of.  I drained the crankcase after I bought it and the oil looked good, but that's not to say they did not add oil an hour before I came to look at it too.  I would consider myself a novice at best and am a little leary of taking on a full rebuild. Can anyone recommend a good mechanic? I did find a guy to work on it locally for $40/Hr, but I have no idea how long it would take to this job. I have downloaded the maunals off this site so I think with time and patience I think I could do the rebuild, but was really hoping to be riding not rebuilding this motor.  Thank you all again for any information.  Mike

Offline slawsonb

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #3 on: May 10, 2016, 11:46:03 AM »
Mike, just start plugging away and ask alot of questions. Anyone you find to work on your bike will probably have less direct experience than you. I don't think you can go too far wrong. At least get it stripped so you can determine if its the trans or crank that is locked. Second the good luck!
...bert

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #4 on: May 10, 2016, 02:41:25 PM »
Okay, maybe I'll give this a shot.  Does anyone know of any special tools that I will need to tackle this job.  I have already been through the parts book and made a list of bearings, gaskets, o-rings etc that I might need?  Thank you all again for reading and sharing your thoughts and ideas.  I am sure that I will be posting some more questions as I get into this. :)  Mike

Offline slawsonb

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #5 on: May 10, 2016, 03:16:03 PM »
Look on pages 56 and 57 of the 90-100 Parts Manual here:

http://bridgestonemotorcycleparts.com/index.php?action=downloads;sa=view;down=82

These pages show Service and Special Tools. I am not a 90 guy, so hopefully one of our 90 whisperers will chime in, but my guess is that the puller and sprocket stopper are the important ones for an engine overhaul. I'm sure some of the members will have some tips on this.
...bert

Online OldSwartout

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #6 on: May 11, 2016, 09:22:32 AM »
You're right on the important tools.  The flywheel puller can be a normal steering wheel puller from your auto parts store; you may need to get different bolts than those that come with it and you may need to grind the slots closer to the center to align with the flywheel holes.  The sprocket stopper is handy, but I've used a large pair of water pump pliers or vice grips. Just be careful to not bend a tip of a sprocket tooth if the sprocket is well-worn.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #7 on: May 11, 2016, 02:07:36 PM »
Please keep the info coming!!  I have been going through the parts manual gathering o-rings, gaskets, oil seals, bearings etc that I think I will need to do a complete rebuild on this engine.  Does anyone already have a list compiled of the recommended parts to be replaced?  If so can you please share it with me.  I would like to go ahead and do the whole job at once without waiting for parts every other day.  Thank you all again.....Mike

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #8 on: May 17, 2016, 11:22:32 PM »
Hello All!  I got around to taking the RH side of the crankcase apart on my 65 Sport 90.  I have attached some pics for you all to look at and see what you think so far.  I appreciate all comments and advice, so please keep it coming.  Thank you all in advance, Mike
« Last Edit: May 17, 2016, 11:31:57 PM by stingray68 »

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #9 on: May 17, 2016, 11:25:53 PM »
More Pics

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #10 on: May 17, 2016, 11:27:44 PM »
Few More

Offline mqtsteve

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #11 on: May 18, 2016, 06:34:15 AM »
Hey Mike,
Are you sure you have a 90 "Sport"?  It looks like the cylinder is cast iron.  The 90 Sports use an aluminum chrome lined cylinder.  The piston, rings and carb are different as well.  Good luck, Steve
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #12 on: May 18, 2016, 08:26:59 AM »
Well, I think so....I'll post a picture of the bike before I tore it apart.  It does look like a sport, the title says sport (doesn't mean much) and the rear tire has the dual sprocket.  As it sits right now the crankshaft does not turn and likewise the kick start is also locked up.  Thank you all for looking, Mike

Offline mqtsteve

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #13 on: May 18, 2016, 08:48:17 AM »
Mike,
The 90 Sport has a single 34 tooth rear sprocket, 17mm carb and aluminum cylinder.  It sounds like you have a Trail or Mountain.  There should be a tag with the serial number and model.  It's located on the right side of the frame below the air filter cover/side cover.  A picture of your bike would help.  Good luck, Steve
« Last Edit: May 18, 2016, 12:57:06 PM by mqtsteve »
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #14 on: May 18, 2016, 11:16:47 PM »
The tag says BS90-T.  Would I be correct to assume this means a trail model?  That being said, should I continue with the dis-assembly of motor and crankcase?  So far I think everything looks nice.  What do you all recommend for the cylinder and piston/rings?  Thanks for all the info....Mike

Offline mqtsteve

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #15 on: May 19, 2016, 05:42:25 AM »
Mike,
Yes, it's a Trail.  The cast iron cylinder is easier to work with.  There are two oversized pistons available and you won't need to get the cylinder re chromed.  Go for it!  These are cool little bikes, Steve
« Last Edit: May 19, 2016, 06:16:14 AM by mqtsteve »
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #16 on: May 19, 2016, 08:01:27 AM »
Hey Steve,

   Thanks for getting me straight on the model number. (I should know better then to believe what the title says.)  Don't suppose you know off hand the oversized piston and rings that I would need? Also, I mentioned this before about the special tools.  Does anyone know if these are available for sale?  Thank you all...Mike

Offline mqtsteve

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #17 on: May 19, 2016, 08:30:05 AM »
Mike,
You'll need to have the cylinder bored and honed to match the piston at a machine shop.  They can measure the bore to determine which piston/rings to use.  There are two available .25/.50 over stock.  You can find the part numbers in the parts manual.  If you haven't downloaded it here's a link http://bridgestonemotorcycleparts.com/index.php?action=downloads;sa=view;down=82  Hope this helps and good luck, Steve
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline stingray68

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #18 on: May 23, 2016, 08:05:58 AM »
I am making some progress with the engine dis assembly and have yet another question and it may be dumb, but....In the repair manual it says after you remove the clutch assembly you should have the transmission in 1st gear.  I have never been able to ride this bike or any other Bridgestone for that matter, but what is the shift pattern for the BS90 Trail?  Thank you to everyone that has chimed in to help me out so far!! Mike

Offline slawsonb

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Re: What's Next? 1965 Bridgestone Sport 90 Engine Seized
« Reply #19 on: May 23, 2016, 11:24:39 AM »
Look on page 32 of the service manual. The pattern is 4 down, but it recycles through Neutral between 4th and 1st. so it may be hard to tell where you are since it will never stop shifting in either direction (gotta watch that the first time you ride it...;-). The bertogram below may help.
...bert

For front shift pedal:
|-N->1->2->3->4->|
|-----------<--------|
Also works in reverse for back shift pedal... ;D
Hey 90 whisperers, chime in if I got this wrong...

 


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