What happend here :0( bad damage

[bri-on-1]

Well i took my head of only to find this damage it looks like somthing has got in and buggered the piston and head

[bigherb]

Yep it is usually one of the carburettor accelerator pump jets.

[blacky]

Oh dear, looks like you're going to work on the Ariel next week then. My mate had one of them,I thought they were nice bikes
That is to say Bri on 1 is going to work on bigherbs Ariel, sorry for mixing you two up.

[shepster]

Clean it up and put it back together, theres nothing there that will cause any problems.

A mate recently had a M6 nut fall in the chamber which got pressed into the head, once removed and cleaned up a bit with a file it ran just as before.

[California Dreamin]

I agree ^^^^^ just surface marks and nothing much to worry about.

Martin

[BOXY]

^^^ What they said.

Here's the head of my RD350LC after it ate a main bearing and spat it out the exhaust. A bit of emery & a polish and it' was nearly as good a new

[bri-on-1]

Thanks all, the head i can save but the piston and barrol are both scored. I do have a spair engine sitting in my shed in bits, can i use a piston and barrol from that if its in better condition?

[kevtherev]

Just hone the bore unless the scratches are too deep.

[itchyfeet]

what engine code is that? CU?

I looked at swapping a single liner and piston on my DG engine but the donor engine wasn't marked with the piston weight group and I didn't risk it in the end.

[bri-on-1]

Yep its the cu engine, By brother said its not to bad at all so i am going to hone the barrels and fit new rings. I will also clean the heads up and fit new valve guides and valves then new gaskets and seals all round