EC300 new piston issue

[Rampart]

Hello
i've got metered my cylinder - 72,05mm. Limit for it 72,1mm as manual says.
BUT biggest piston size will have 71,95mm what will give 0,1 mm clearance - and it is out of limit as manual says! What should i do in this case?

 

[dANbOT]

I just took a look on ebay, and saw Wossner pistons in 72.01 and 72.02 sizes if that helps

 

[Rampart]

72.01 will be perfect! Can you provide link? Are some one using them? Is this original piston?

 

[Getoviq95]

Try wiseco ,they're only one size .I belive they are 72,00 .

 

[dANbOT]

72.01 will be perfect! Can you provide link? Are some one using them? Is this original piston?

http://m.ebay.com/itm/Wossner-Pisto...ndard-Bore-B-72-01mm-/371415802120?nav=SEARCH

 

[Rampart]

$197.99 + $46.50 for shipping = sounds a little bit crazy
Thank you for link

 

[dANbOT]

Well, it was only an example that the size is available. Wossner is about the best Piston you can put in your gasser, should be available from many locations. Perhaps a better price can be found.

 

[Rampart]

OK, thx, i understand.
But how can you tell that it fits? Diameter is ok, but how about piston pin to top distance?

 

[dANbOT]

Wossner makes these for our Gasgas bikes, no need to worry about that.
Here is their website, so you can look up fitment for your specific bike, and then chose diameter. I believe they offer A through D sizing. Once you have the part number you can search for a vendor anywhere you want.

 

[hadfield4wd]

My 250 uses a ktm piston.

 

[Rampart]

hmm
why there is no systematized information about piston Interchangeability? People don't change them?)

 

[Rampart]

Wossner makes these for our Gasgas bikes, no need to worry about that.
Here is their website, so you can look up fitment for your specific bike, and then chose diameter. I believe they offer A through D sizing. Once you have the part number you can search for a vendor anywhere you want.

Thank you a lot

 

[Getoviq95]

http://www.ebay.com/itm/371415802120
This wossner isn't 72.01mm ,72.01 is cylinder bore ,but the piston is size B or 71,94 or 71,95mm .Put wiseco they are 72mm and are forged too .Vertex have 71,96 and 71,97mm .

 

[Rampart]

sooooo like i said - people don't change pistons, or don't understand what they are putting inside the motor))) Thank you Getoviq95

 

[Rampart]

quote from wiseco site:

Wiseco Powersports pistons are designed for optimal piston to wall clearance for the specific bore size of your engine. For example, your 125cc dirt bike engine is 54mm bore, the Wiseco piston is designed just for that bore size, and does not require any specific adjustments to fit properly.

So their piston for gasgas has same diameter like original pistons for gg. For Boresize of 72.00mm http://www.wiseco.com/ProductDetail.aspx?ItemID=850M07200&ModelID=161&ModelYear=2011&AppID=4988

Such a strange situation. gg have only 3 piston sizes, and they don't cover anything eventually.
hmm and seems like ktm have the similar situation. Sorry guys, it's first 300cc for me, and everything is new. I just trying to understand how to live with it)

 

[dANbOT]

oooooops sorry for the incorrect info.
Maybe check ProX pistons.... I know with my last bike (honda cr250) honda only offered an A or B piston, but ProX had A, B, C, and D for me to chose from.

 

[Rampart]

Maybe check ProX pistons....

Checked - same sizes as original