crank cases

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Glyn.G
To the on ramp
Posts: 207
Joined: Fri May 30, 2014 5:41 am
Country: UK
Suzuki 2-Strokes: Suzuki GT380 B- Yamaha FZ1
Location: High Peak Derbyshire.

crank cases

Post by Glyn.G »

Hi everyone,
I am about to bolt up the cases on my 380 but which half do you put the Threebond on before bolting up. Do I fit the crank and gear shafts,seals etc in the bottom half then coat the bottom half with the sealant working around the seals,bushes etc or do I coat the top half with the sealant and drop the top half onto the bottom.
It's just I don't want to block any oil passages in the lower half with sealant.
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Alan H
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Country: England
Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
Location: The Republic of South Yorkshire

Re: crank cases

Post by Alan H »

Glyn.G wrote: Wed Jul 06, 2022 1:25 am Do I fit the crank and gear shafts,seals etc in the bottom half then coat the bottom half with the sealant working around the seals,bushes etc or do I coat the top half with the sealant and drop the top half onto the bottom.
Yes, and only use a 'smear' - or thinly 'butter' the flange using a penknife or similar
Think of how stupid the average person is, then realise that half of them are more stupid than that.
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jabcb
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Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: crank cases

Post by jabcb »

All the parts are in the bottom half. So it’s easier to apply the Threebond to the top half.
I apply a bead of Threebond & then use a finger to smear it around.
Position the connecting rods to make it easy to feed them through the top half when assembling the cases.

Did the GT550 a while ago, which is similar.
The kick starter shafts tends to not want to stay put.
https://www.partzilla.com/catalog/suzuk ... ck-starter

Leave the plug (part #14) for installation later. I use a small spring clamp to hold the bushing (part # 11) in place.
The plug has a slight taper on the OD to make it easy to tap into place.
Use a smear of Threebond on the plug OD to act as a lube & the plug taps in easily.

The factory probably used something like a painting roller to apply sealant to the top half. And had a specialized tool to hold the kick starter shaft in place during assembly.

One of the UK GT750 experts sells rebuild DVDs on eBay. Very useful tips. He applies the sealant to the top half & uses his fingers.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
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Alan H
Moto GP
Posts: 3160
Joined: Thu Feb 16, 2012 11:50 am
Country: England
Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
Location: The Republic of South Yorkshire

Re: crank cases

Post by Alan H »

jabcb wrote: Wed Jul 06, 2022 7:50 am One of the UK GT750 experts sells rebuild DVDs on eBay. Very useful tips. He applies the sealant to the top half & uses his fingers.
I'll check if they are still available.
Must admit, I never stripped & rebuilt a Kettle motor, but he does it for a living.
Think of how stupid the average person is, then realise that half of them are more stupid than that.
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jabcb
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Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: crank cases

Post by jabcb »

I bought it a few years ago from eBay seller Bluesmokebaz. That ID is no longer valid.
Looks to have switched to bluesmokebaza. See this listing that ended last month:
https://www.ebay.co.uk/itm/275129797885
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
User avatar
jabcb
Moto GP
Posts: 4240
Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: crank cases

Post by jabcb »

New eBay listings for the useful GT750 rebuild info:
https://www.ebay.com/itm/275376886775
https://www.ebay.co.uk/itm/275376886775
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

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