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Oversized pistons question

  • Thread starter Thread starter Shug1e
  • Start date Start date
S

Shug1e

Guest
Hello, got some bad news from my local machine shop today, turns out i need a rebore on the barrels of my GS1000. The origional bore size is 70mm and i have been advised to buy a set of four 70.50mm pistons and new rings. A new set will cost close to ?400 and i was wondering if it is possible to source a set of used 70.50mm pistons but replace with new rings? Thanks Shug1e:-|
 
Those look really nice. If I had the $$ those would go into one of my 1000's - they are ready for factory or better compression, after 60,000mi.
 
Gs1000

Gs1000

At some stage my Gs barrels will need a rebore im not after more power
so no cams will be fitted do I realy need to weld up crankshaft.
 
If you are splitting the cases for a rebuild I would do it. AT the least you need to check top dead center for #1&4 should be the same or the crank is twisted
My sugestion if money is tight try and fine another set of cylinders
 
Oversized pistons question

Thanks fellas, ordered the WIESCO 3mm overbore kit today. It comes with a new cylinderhead gasket, seems like a good deal, just wish i`d known i needed a rebore before ordering a new Vesrah gasket! Which of the two would you use? does the overbore matter and what is your estimation of the engines CC increase? thanks Shug1e:)
 
Shug1e said:
Thanks fellas, ordered the WIESCO 3mm overbore kit today. It comes with a new cylinderhead gasket, seems like a good deal, just wish i`d known i needed a rebore before ordering a new Vesrah gasket! Which of the two would you use? does the overbore matter and what is your estimation of the engines CC increase? thanks Shug1e:)
Click to expand...

I believe I've seen 1085cc quoted for the 3mm oversize. I don't know what type of gasket Wiseco supply with their kits. I don't recall anyone complaining about them though. I used the standard Vesrah gasket on my 850 with 10.5-1 pistons and have had no problems. Your call really.
 
I've used the Wiseco gaskets in other over-bored toys and have never had a problem...they supply a high quality product, across the board. \\:D/
 
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