Broken land about 30mm longpiston diameter 102mm,vn1600 kawasaki 5 thou over! Shall i weld it! then pop it in the lathe!
ginga4lyfe,
Apr 29, 2:18pm
for s show piece yes, for use in the engine, no, they heat and vibrations an g-forces of that piston moving so fast will just crack it again IMO
purple666,
Apr 29, 2:33pm
Have run a few welded pistons, repaired hole in crown, never had a problem with them
joanie32,
Apr 29, 2:46pm
Idoafew for customers. probably 90% pass rate
crzyhrse,
Apr 29, 3:10pm
Bit different to a skirt though.
bentcoupe,
Apr 29, 3:16pm
Its up hightop ring land,
unclejake,
Apr 29, 3:17pm
Are pistons actually round at that point!
crzyhrse,
Apr 29, 3:18pm
Wasn't paying attention.
Might get away with it then.
crzyhrse,
Apr 29, 3:22pm
x1
Isn't it usually the skirts that are manufactured out of round for expansion! The crown is pretty much the same volume in all directions.
It's not going to be a lot anyway.
bruceeeeee,
Apr 29, 3:24pm
Had the Patrol swallow a screw that caused a lot of damage to that area. Piston was welded and the grooves recut on a lathe and the motor goes like a dream.
plasticboys,
Apr 29, 3:24pm
l have welded a lot of pistons only on the top. if you do weld it heat the piston up with a blow touch and take the cut cause a piston is not round
mrfxit,
Apr 29, 4:10pm
Probably ok as long as you don't intend to street race it or go touring 2 up + gear all over NZ
bentcoupe,
Apr 29, 4:17pm
Talked to a few guys,could also lower compression a bit also put bigger oiling holes in pistonmite help it,Piston has been damaged by seizing
thejazzpianoma,
Apr 29, 5:28pm
Is this something rare that you can't just buy a piston for! Assuming you can buy a piston for a good price it all seems a lot of risk and hassle for minimal financial gain.
desmodave,
Apr 29, 5:34pm
Its a Japa jaz, and ya knowthey arnt cheap to keep on the road.
intrade,
Apr 29, 6:34pm
you have to know what your doing but remember burt monroe made his own pistons and his all worked . so if you do it correctly like making sure its the correct waight and not expanded misshaped etc then you should be able to fix
berg,
Apr 29, 7:06pm
Try Evilbay. I got all my jetski engine parts from USA (kawasaki) for less than half what I would have paid here.
Yes crowns are round, rest of piston has variable profiles, most oval at gudgeon pin holes. In addition to running welded pistons I have also tried cam (oval profile) grinding oversize pistons to fit smaller bores but after a few attempts gave up as they tended to nip up. This was back in the 70's when motorcycle bits were hard to come by and had a mate who was a rather clever automotive engineer. He even experimented with a cloverleaf shaped inlet valve and seat to prove a point about airflow at low lift
thejazzpianoma,
Apr 30, 2:23pm
LOL, nice call.
saki,
Dec 27, 7:14pm
As long as you match the filler rod with the piston
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