Chrome bores and chrome rings

[William Doe]

What's the go with Chrome bores ? Honda red rockets and YZ 125A models specifically 

What rings do you run in them , is it std cast rings in chrome bores and chrome rings in steel bores ?

And what about nikasill and other plated bores , what rings can you run in them ?

Thanks Bill

[sleepy]

Chrome bores - cast iron rings.
Nikasil - cast or chrome rings.

You would be very lucky to find a chrome bore still usable.

[tony27]

Crazy Phil had his red rocket cylinders replated by NZ cylinders & uses wossner pistons in it, he seems to be really happy with their work. The wossner pistons will be using the same rings as any modern bikes

[GMC]

There were very few actual models with Chrome bores, the 2 you mention may be the only ones.

Unfortunately every plated cylinder that has a Nicasal bore or Electrofusion bore gets called chrome which causes a lot of confusion.

Nicasal & Electrofusion bores use the same pistons and rings as cast iron bores.

The actual real chrome bores can't use chrome rings otherwise they will seize

[oldfart]

 early Ts 250 had a chrome bore also.

[sleepy]

Best thing you can do with a plated cyl is to get it sleeved in cast iron. That's what cylinders are meant to be made off.

[mustanggrahame]

Sleeved cylinders don't transfer heat properly. Replating a cylinder is a much better idea.

[OverTheHill]

Still kicking myself--a few years ago i decided to give my worn out DT1 GYT kit chrome cylinder [1968] one more run as it always went really well & didn't drop off power when hot like the DT1MX cast bore does [that i have]. Anyway--i Fkd up big time because i picked the 'best of the rest' piston & shuffled around all the old rings [assortment] Knowing full well the right ring must be used & bloody well picked the wrong one. They were all used rings & couldn't decide which was cast but possibly none were, in that box in the end. Short story long--it stuffed it in about 100 metres. Might fix it one day.
Another time back in the  late "60's at a guess a mate had a 'Starmaker' motor[were they villiers?] in a C15, the second model C15 with Ally tank--good looking bike after the goosneck frame that bent. Anyway, he had a chrome cylinder on it  [not sure if aftermarket or came like that but] same story although don't think us budding mechanics knew the implications of running the wrong ring till then. Was an instant learning curve--flat out down our country road & destroyed itself. Damn.

[HeavenVMX]

early Ts 250 had a chrome bore also.

I thought those mid 70's TS250s had a plated bore a bit like the Kawasaki Electrofusion not actually chrome. Could be completely wrong only going on memory from a mates bike.

TZ125, 250, 350 & 700/750 all had chrome bore as far as I know

[Brian Watson]

the BSA B44 GP had a chrome bore.. in 1965..

[Doc]

I thought those mid 70's TS250s had a plated bore a bit like the Kawasaki Electrofusion not actually chrome. Could be completely wrong only going on memory from a mates bike.

yup..'76 TS250A had a Nikasil coating of types called SCEM (Suzuki Composite Electro-chemical Material)

[huskibul]

   Didnt yz 125C have a chrome bore , I remember Bitd having the choice of buying a 125C or a red stripe elsinore i opted for the elsie as someone said the C had chrome bore which was bit of a  a put-off - no rebore's   

[sleepy]

Sleeved cylinders don't transfer heat properly. Replating a cylinder is a much better idea.

You obviously have never had a sleeve fitted properly.

[GMC]

Sleeved cylinders don't transfer heat properly. Replating a cylinder is a much better idea.

I reckon so too.

My KDX 175 barrel is buggered and needs replating but you have to give it credit for lasting 33 years on original bore, you won't get a cast iron sleeve do that.

I have a 88 KX 125 barrel that has a steel sleeve fitted, will gladly swap it for a non sleeved barrel in any condition.

[Iain Cameron]

   Didnt yz 125C have a chrome bore , I remember Bitd having the choice of buying a 125C or a red stripe elsinore i opted for the elsie as someone said the C had chrome bore which was bit of a  a put-off - no rebore's   

No only the A&B's had the chrome bore's 125 , 250 & 360 .