August 5th, 2013, 07:46 AM | #1 |
ninjette.org member
Name: JJ
Location: USA
Join Date: Jul 2013 Motorcycle(s): 2018 Ninja 400 Race Bike (in progress...) Posts: 126
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250 Pistons fit in 300?
Looks like bore/stroke from the later model 250R was 62mm x 41.2mm with 11.6:1 compression. The 300 is listed as 62mm x 49mm with 10.6:1 compression (supposedly lower so it will run on 86 octane pump gas). So I'm wondering if a set of 250R race pistons from Wiseco at 12.5:1 compression will work on the 300 engine? I haven't taken it apart yet to see how the combustion chamber looks compared to the 250R, but hoping it might work to get a high-comp racing piston setup for the 300? Also a 2mm and 4mm overbore piston is available for the 250R, can we do the same with the 300? Anyone done any internal engine mods at all on a 300 yet? I haven't found anything by looking around yet, but I'm willing to try it if no one else has.
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August 5th, 2013, 10:00 AM | #2 |
Simple kind of man
Name: Ryan
Location: Stuttgart, Germany
Join Date: Apr 2013 Motorcycle(s): 2013 Ninja 300 Posts: 133
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I don't think there's enough cylinder wall clearance to allow for any (much) overbore.
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August 6th, 2013, 07:53 AM | #3 |
ninjette.org member
Name: JJ
Location: USA
Join Date: Jul 2013 Motorcycle(s): 2018 Ninja 400 Race Bike (in progress...) Posts: 126
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Supposedly the cylinders are the same as the 250R, so should allow +2mm or +4mm?? However, the Wiseco rep told me that the pistons from the 250 won't work on the 300 but they'll make 300 pistons if I send them one of mine to use for the design. So that's the plan, but I won't be able to tear it down until our track day season is over in October. If anyone else has a 300 piston available sooner, let me know and we can get it over to Wiseco to start making the kits!
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August 6th, 2013, 08:36 AM | #4 |
ninjette.org certified postwhore
Name: Jason
Location: Norfolk, VA
Join Date: Dec 2011 Motorcycle(s): 2012 EX250, 2014 EX300 Posts: A lot.
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same diameter but the lining is different
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August 6th, 2013, 08:40 AM | #5 |
ninjette.org member
Name: JJ
Location: USA
Join Date: Jul 2013 Motorcycle(s): 2018 Ninja 400 Race Bike (in progress...) Posts: 126
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