Crankcase re-assembly

Does your Spree/Elite already run great, and you're trying to make it quicker/faster? Need a monster motor swap? Discuss your ideas here.

Moderator: Moderator

Post Reply
User avatar
sum_azn_kid
Goped
Goped
Posts: 90
Joined: Sun Sep 24, 2017 7:14 pm
Location: hawaii

Crankcase re-assembly

Post by sum_azn_kid »

I've always used a crank puller to assemble dirt bike and scooter cases (as the Honda service manual shows). But I noticed a lot of Europeans on YouTube and forums use the heatig method(heat up crank case to expand the metal). Which method better? And your thoughts?
Last edited by sum_azn_kid on Tue Dec 12, 2017 4:40 am, edited 1 time in total.
Super Dio ZX "Ube"
72 corsa
User avatar
Chubbyfunkmonkey
Goped
Goped
Posts: 51
Joined: Mon Nov 06, 2017 2:14 pm
Location: Seattle

Re: Crankcase dis-assembly

Post by Chubbyfunkmonkey »

I use a hammer, not recommended
1989 sb50p
2005 ruckus 50cc custom
2009 ruckus 125cc 4speed
pitobread
Goped
Goped
Posts: 54
Joined: Fri Nov 18, 2016 1:33 am

Re: Crankcase dis-assembly

Post by pitobread »

Once you use heat, you'll never go back. It slips together, no banging or fuss. I put my cases on my space heater in the garage, they get uncomfortably hot, then it literally slides together.
User avatar
sum_azn_kid
Goped
Goped
Posts: 90
Joined: Sun Sep 24, 2017 7:14 pm
Location: hawaii

Re: Crankcase re-assembly

Post by sum_azn_kid »

Do you freeze the crank and bearigs too?
Super Dio ZX "Ube"
72 corsa
User avatar
Wheelman-111
Moderator
Moderator
Posts: 11319
Joined: Wed Oct 22, 2008 5:09 pm
Location: Deepinnaharta, Texas

Re: Crankcase re-assembly

Post by Wheelman-111 »

Greetings:

If the cases are oil-free, and Ms. Sum_Azn isn't on the premises, heating to 300 or so AND freezing the crank makes things so much easier. I've done the same thing to install the case bearings, and had one literally drop into place without a single blow. The frost on the bearing acts as a lubricant and the clearance improves enough for force not to be necessary. Welding gloves make it all possible.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
User avatar
kuromi
Spree
Spree
Posts: 158
Joined: Fri Jul 03, 2015 4:21 am
Location: Manchester, England

Re: Crankcase re-assembly

Post by kuromi »

@Wheelman - I've always wondered if the frost on frozen bearings has any ill affects later on.
Have you ever had any issues e.g. with disassembly?
1983 Melody Deluxe II / ND50MC
1984 Melody Mini / NP50D
1979 Simson Schwalbe KR51/1 (think 2 wheel trabant/ East German Honda Cub)
User avatar
sum_azn_kid
Goped
Goped
Posts: 90
Joined: Sun Sep 24, 2017 7:14 pm
Location: hawaii

Re: Crankcase re-assembly

Post by sum_azn_kid »

Wheelman-111 wrote:Greetings:

If the cases are oil-free, and Ms. Sum_Azn isn't on the premises, heating to 300 or so AND freezing the crank makes things so much easier. I've done the same thing to install the case bearings, and had one literally drop into place without a single blow. The frost on the bearing acts as a lubricant and the clearance improves enough for force not to be necessary. Welding gloves make it all possible.
Sum_azn_girl doesn't use the oven so it's fair game... wish she did though :eyeroll: haha.
Super Dio ZX "Ube"
72 corsa
User avatar
Wheelman-111
Moderator
Moderator
Posts: 11319
Joined: Wed Oct 22, 2008 5:09 pm
Location: Deepinnaharta, Texas

Re: Crankcase re-assembly

Post by Wheelman-111 »

Greetings:

Never had an issue. That water boils away pretty quick with a 300-degree case, plus it's bathed in oil...
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
User avatar
kuromi
Spree
Spree
Posts: 158
Joined: Fri Jul 03, 2015 4:21 am
Location: Manchester, England

Re: Crankcase re-assembly

Post by kuromi »

Cheers, Wheelman :thumbwink:
1983 Melody Deluxe II / ND50MC
1984 Melody Mini / NP50D
1979 Simson Schwalbe KR51/1 (think 2 wheel trabant/ East German Honda Cub)
Post Reply