Broken land about 30mm longpiston diameter 102mm,vn1600 kawasaki 5 thou over! Shall i weld it! then pop it in the lathe!
ginga4lyfe,
Apr 28, 11:18pm
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 28, 11:33pm
Have run a few welded pistons, repaired hole in crown, never had a problem with them
joanie32,
Apr 28, 11:46pm
Idoafew for customers. probably 90% pass rate
crzyhrse,
Apr 29, 12:10am
Bit different to a skirt though.
bentcoupe,
Apr 29, 12:16am
Its up hightop ring land,
unclejake,
Apr 29, 12:17am
Are pistons actually round at that point!
crzyhrse,
Apr 29, 12:18am
Wasn't paying attention.
Might get away with it then.
crzyhrse,
Apr 29, 12:22am
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, 12:24am
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, 12:24am
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, 1:10am
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, 1:17am
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, 2:28am
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, 2:34am
Its a Japa jaz, and ya knowthey arnt cheap to keep on the road.
intrade,
Apr 29, 3:34am
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, 4:06am
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 29, 11:23pm
LOL, nice call.
saki,
Dec 27, 2:14am
As long as you match the filler rod with the piston
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