KX85 cylinder wanted

[Jebus]

Hey, My partners 03 KX85 motor has a damaged bore, does ayone have or know of a good condition useable KX85 cylinder for sale?

Just trying to get it up and going quickly without spending a fortune.

Thanks!

[FJRider]

How badly damaged ... ???

[Jebus]

Not really bad, just rough scoring. Not good enough to use though. It had 85psi and wouldnt run before I pulled it down.

I can get a picture up shortly? Boring and rechroming is a bit more than im wanting to spend.

[FJRider]

Is there any reason a HONE would not remove it ... too deep ... ????

[Jebus]

Im not 100% Sure, ill try get some good pictures and see what you think. Is it possible to hone the cylinders without damaging the chrome? I havnt done a 2 stroke rebuild before sorry, so pretty new to dealing with these.

[FJRider]

Take it to a bike shop and ASK ... (or ask here :lol:)

[Katman]

Im not 100% Sure, ill try get some good pictures and see what you think. Is it possible to hone the cylinders without damaging the chrome? I havnt done a 2 stroke rebuild before sorry, so pretty new to dealing with these.

Nikasil bores don't get honed.

[Jebus]

Sweet thanks.

Still looking for a good cylinder if anyone has one.

[doddzee]

Thought of replating it?

http://www.kiwibiker.co.nz/forums/showthread.php/118934-Cylinder-replating

[F5 Dave]

Nikasil bores don't get honed.
Well yes they do, but. . . best not try this at home. Or unless you have the right hone.

Clearly they are honed when first plated. After that is at risk.

Your answer is mostly right, just being a pendent.



oh yeah you won't find a good unused cylinder. They get used until damaged.

Your bike is largely worthless unless you plate it, so you'll have to suck it up & get a quote.

Try NZcyl, motocross parts nz do good prices on pistons. [Checks], $99 for a piston kit, not bad at all.

[Pornstar]

are you sure its scored? or is there piston stuck to it? if its the latter then some hydrochloric acid should dissolve it leaving the bore.

[barty5]

get it sleeved half the price or recoating is around 550 failing that try ebay

[F5 Dave]

only sleeving jobs I've seen were around the 6hundy mark & that's a poxy fix.

USchrome were quite cheap & good to deal with + impeccable quality. used before NZ cyl.

$198 US at todays exchange, but + freight both ways. See what local will do for you.

http://www.usnicom.com/price.asp


(http://www.usnicom.com/price.asp)

[Crasherfromwayback]

Clearly they are honed when first plated. After that is at risk.

.

I can't recall ever seeing a Kawasaki Electrofusion cyl with hone marks on it from new.

[F5 Dave]

They plate them & have to hone them to correct size. There is no way they'd get so lucky that it all went on straight & true & the right thickness tp get the right clearance. The hone they use will be a fixed diameter & may be real thin grit so look smooth. Quite unlike a iron bore hone.

All my replates have had hone marks. Can't say I rememebr the kdx having much in the way of marks, but it was flogged.

[scott411]

the price to replate a kx85 barryl has always been touch and go to buying a new one,

i might know of a second hand one around, pm me your email details and ill ask someone who i think might have one

[Jebus]

Ok cool, thatd be great. I dont have enough posts to PM yet (Ive been a long time reader but never had much to post), so heres my details, mark@branthomes.co.nz or 021 2999 798. If you could help it would be great,

Cheers!

[Jebus]

Heres a few pics of the bore, and the piston that came out of it.

256528
256529
256530
256531

[Rupe]

just buy one off ebay. you could chuck a 100cc on on too

[Crasherfromwayback]

Heres a few pics of the bore, and the piston that came out of it.



From here...that actually looks useable to me. May well be a lil alloy still left on the cyl wall. But clean that off, and away you go with a fresh piston and rings I'd say. I'm thinking the compression was down as the rings were stuck in the groove?

[scott411]

From here...that actually looks useable to me. May well be a lil alloy still left on the cyl wall. But clean that off, and away you go with a fresh piston and rings I'd say. I'm thinking the compression was down as the rings were stuck in the groove?

i agree, but hard to make a call off picutes,

take it out to Mr Motorcycles in Pukekohe, no one has done more work on kx85's than us

talk to Steve the workshop manager, or one of the senior workshop guys and they will tell you straight,

[Jebus]

hhhmm....Ok Ill do that, im just in Karaka so will head down tomorrow afternoon. What do you do there scott?

I Hope you guys are right:scooter:

[scott411]

i am one of the owners, but currently away on a quite a long holiday,

[B0000M]

hit it with some sandpaper. it won't touch the nikasil - it's way too hard.

it should come up quite nice with some time spent on it. i've seen this done successfully a few times.



everyone is way too paranoid about nikasil coatings!

i wouldnt do this to my race bike but if it was old and for the mrs i wouldnt think twice!

[SpikedPunch]

I did something similar to my kx100 and took it to engine specialties in Wairau, they diamond honed it for $35 and sent me on my merry way, I put a new piston and rings in and it ran a-ok for the rest of the time I had it.

http://www.enginespecialties.co.nz/

[barty5]

there is a guy in ponsonby that can do it as well he is next to Forket automotive only cost me $20 cash when i had one done friday special.

[Jebus]

I ended up getting the cylinder honed at Mr Motorcycles, it came back like new and ive just finished installing the piston etc. It fired up and ran great.

Thanks for your help!

[scott411]

just as a note, we use a very light hone to clean up these cylinders as not to damage the coating, glad we could help

[Crasherfromwayback]

I ended up getting the cylinder honed at Mr Motorcycles, it came back like new and ive just finished installing the piston etc. It fired up and ran great.

Thanks for your help!

Thought it looked ok! Nice outcome.