OzVMX Forum

Clubroom => Tech Talk => Topic started by: Bitten on April 12, 2011, 03:03:32 pm

Title: Using pistons for other makes / models
Post by: Bitten on April 12, 2011, 03:03:32 pm

I put something up in the Suzuki section but wanted to throw this a bit wider.......

I have been advised that I can use a Wossner or Wiseco piston for a Maico 490 in my Suzuki RM 465 Z

They have one with an 87mm bore and I am currently on 86.5mm (86 Std + .50 OS). I can only assume the Maico had the same stroke (80mm)

I am a bit of a first timer so.....

Has anyone had any experience with using pistons made for other bike brands?
Any pitfalls?

Cheers

Title: Re: Using pistons for other makes / models
Post by: Bitten on April 12, 2011, 03:48:44 pm

Further to my previous post I just looked up the Bore and stroke on the 1981 Maico GSF 490 and it is 86 x 83mm

Again it might be a dumb question but the RM 465 is 86 x 80mm, I would imagine the 3mm extra stroke will be problematic if I was to use an 87 x 83mm OS Maico piston in the RM

Is there another 490 maico with a 80mm stroke or is the advice received no good as I don't want to spend $238 on something that is not appropriate

Cheers

Bitten

Title: Re: Using pistons for other makes / models
Post by: Lozza on April 12, 2011, 04:40:15 pm

Geez what are you thinking, fire , flood and locust plagues will surely follow ;D

Check the rod length and compression heights of the respective pistons should give you an idea if the swap is fesable

Title: Re: Using pistons for other makes / models
Post by: shelpi on April 13, 2011, 11:22:59 am

i take it the boys from circo serco did all the usual checks ie gudgen to crown height and gudgen to skirt and the ring location pins are in the same spot and or a mirror image? if yes idoes not matter what the strokes where or are as long as the port timeing remains the same and piston crown is the same ;) see if you can beg borrow or steal an old maico piston for a total comparrison, piston porting, rings, crown, skirt.right color
Go to the WOSSNER site i posted and see the rm stuff, then can give part number to da boys

Title: Re: Using pistons for other makes / models
Post by: Bitten on April 14, 2011, 09:57:21 pm

Ok, can someone post up on this thread the dimensions of a Maico 490 piston (87mm bore)

Top of crown to top of piston pin hole (excuse my ignorance!)
Gudgeon / piston pin diameter
bottom of piston pin hole to bottom of skirt

anything else I am missing?

I appreciate any assistance that can be provided

Cheers

Title: Re: Using pistons for other makes / models
Post by: gorby on April 14, 2011, 11:01:59 pm

Firko,I think he is looking at putting a maico piston in his suzuki RM 465

which is very hard to source a piston for.

Title: Re: Using pistons for other makes / models
Post by: firko on April 14, 2011, 11:27:36 pm

Quote

Firko,I think he is looking at putting a maico piston in his suzuki RM 465

Oops ......my meds are kicking in earlier than I thought. ;D You're so right so I've removed my post. Thanks Gorby.

Title: Re: Using pistons for other makes / models
Post by: Bitten on April 15, 2011, 01:08:57 pm

Yep correct .... I know it's Sacrilege and I will burn in hell!!

3rd OS piston kits for RM465's are like rocking horse poop and I was told that this would work and wanted to do some homework before investing my hard earned.

Looks like I can source another cylinder which I will do anyway but any assistance from those more experienced would be great as I am not sure if this type of transplanting in quackery or common practice.

Cheers

B

Title: Re: Using pistons for other makes / models
Post by: Lozza on April 15, 2011, 01:10:59 pm

Quite common but still comes down to comp height, stroke and rod length.