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PostPosted: Sun Dec 02, 2018 5:56 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Rats! Am working the the GT550 cafe build.

We were assembling the motor today & found out that the right outer bearing is on backwards.
This bearing has a groove for the C-ring that laterally positions the crank. The parts diagram is also wrong. Presumably the shop assembled it as show in the diagram.

How difficult is it for us to flip the bearing around? (Am weighing the tradeoff of fixing it ourselves vs. the delay of having the shop do it.)
Will the oil seal be damaged in the process of removing the bearing?

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Tue Dec 04, 2018 6:59 am 
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To the on ramp

Joined: Fri Aug 11, 2017 7:09 am
Posts: 362
Country: england
Bikes owned: several gt250 ramairs
hi jab, you'll definitely need a bearing puller - those bearings are on TIGHT. you need the type that tucks in behind the bearing, not a 3 leg. i bought one of these kits years ago, and although it's a bit of a pain to set up, it was well worth the money. the 2 black bits at the top of the photo are the sort to use :D
cheers, dd.
https://www.ebay.co.uk/itm/Hub-Bearing- ... rk:33:pf:0

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GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.


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PostPosted: Tue Dec 04, 2018 7:38 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Thanks for the info.

Using a tool like that likely will damage the oil seal. Also not sure how to get the bearing off without damaging it. So I’ll order a new seal and have the shop do the fix.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Tue Dec 04, 2018 8:41 pm 
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On the street

Joined: Tue Aug 22, 2017 5:29 pm
Posts: 20
Country: Canada
Bikes owned: Original owner GT550L
Yes, c clip groove is on the inside!


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PostPosted: Sun Jan 06, 2019 3:06 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Quadruple double rats!

Got the crank back from the shop with the bearing oriented correctly. Tried installing the crank & it doesn’t turn!
Compared the dimensions to the specs per service bulletin Specification-7, and the 5 listed dimensions are out of spec.

Don't know what's up. The shop previously rebuilt a few cranks for me & they were fine.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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 Profile  
 
PostPosted: Sun Jan 06, 2019 3:55 pm 
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On the main road

Joined: Sat Sep 05, 2015 3:14 pm
Posts: 175
Location: southeast pa
Country: us
Bikes owned: GT
That stinks :(
I have my 550 crank and lower case at the shop now, they like having the lower case and installing crank in it. Hopefully won't have issues.

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


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PostPosted: Sun Jan 06, 2019 4:41 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
When he flipped the bearing to orient it correctly, he also flipped the drive gear so that is now wrong.
The error for each of the 5 measurements is small but they add up. Combine those errors with the gear on backwards & the crank can’t turn.
But even if it could turn correctly, the points cam can’t engage the locating pin on the drive gear.

I wish I had thought of giving them the lower case half. This is my first triple build & I didn’t know.
You should be ok. If the crank turns, then you don’t have the problems I’m dealing with.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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 Profile  
 
PostPosted: Mon Jan 07, 2019 3:42 pm 
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Around the block

Joined: Thu Oct 11, 2018 2:27 pm
Posts: 66
Location: Stoke england
Country: United Kingdom
Bikes owned: Yr5 t500j
What's happening ,are the flywheel s catching the crankcase? Are you taking it back with the lower crankcase?


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PostPosted: Mon Jan 07, 2019 7:04 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Right flywheel of the left cylinder rubs and the drive gear rubs.

I’m undecided on what to do. I ordered new crank seals today to replace any of the new seal that gets damaged if they have to pull the crank apart.

I’m considering two choices:
1) send the crank & new seals to Bill Bune
2) Give the shop another chance. This time they would get the crank, new seals, Specification-7, pics of a correct crank, and the lower case

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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 Profile  
 
PostPosted: Thu Jan 24, 2019 5:55 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Ended up sending the crank to Bill Bune.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


Top
 Profile  
 
PostPosted: Thu Mar 07, 2019 7:17 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Got the crank back yesterday. Fit perfectly. :D

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


Top
 Profile  
 
PostPosted: Fri Mar 08, 2019 4:58 am 
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On the main road

Joined: Thu Nov 07, 2013 1:59 pm
Posts: 145
Country: United Kingdom
Bikes owned: A100 GT250 & 4t Yams!
Any recompense from the first shop?


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PostPosted: Fri Mar 08, 2019 7:20 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3384
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
The local shop rebuilt the crank for the GT250 cafe build & did a bunch of top ends. All of the prior work was fine.
Had I given the shop the lower crankcase half + the service bulletin with the specs, this crank probably would have been fine too.

I’m not going to try to get any $$$ back. There are very few places that work on vintage bikes. I’m not going to poison the well.
The local shop has a pretty low hourly rate. He has a good reputation & knows he screwed up. I see it as lesson learned for him.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


Top
 Profile  
 
PostPosted: Fri Mar 08, 2019 9:45 am 
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On the main road

Joined: Thu Nov 07, 2013 1:59 pm
Posts: 145
Country: United Kingdom
Bikes owned: A100 GT250 & 4t Yams!
jabcb wrote:
The local shop rebuilt the crank for the GT250 cafe build & did a bunch of top ends. All of the prior work was fine.
Had I given the shop the lower crankcase half + the service bulletin with the specs, this crank probably would have been fine too.

I’m not going to try to get any $$$ back. There are very few places that work on vintage bikes. I’m not going to poison the well.
The local shop has a pretty low hourly rate. He has a good reputation & knows he screwed up. I see it as lesson learned for him.


Fair enough - we all make mistakes,. Good of you to take it on the chin.


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