Time for a head job? Or just keep grinding?

[Swiss Toni]

13 hours ago, TonyGee said:

one thing i do know is, grinding 16 valves in is the worst job to do on an engine    

Unless you have a certain 6 cylinder, from ‘somewhere else’!

[Isleoman]

On 3/26/2021 at 5:51 PM, dago said:

Tell me about it, them poor 5 valve head yam guy's. You've got to remember they only shut for a fraction of a second and have about 150 psi pushing them into their seats

Yea but,  the five valve Yamaha heads are pretty ultra reliable.  I've had two 1000cc heads go 150K miles without ever even adjusting the valves.  My current one still lifts the front wheel with ease, no smoke, 50 mpg, and only within spec oil use.    My 4 valve Suzuki was rebuilt three times in 100K.  When I get it back together it will be a 4th time.    

 

 

[gorbys]

So for the water test the valves need to be assembled with springs and everything? 

[dago]

Yep springs, retainers and collets on and turn upside down

[gorbys]

7 hours ago, dago said:

Yep springs, retainers and collets on and turn upside down

Cool. How long do I leave it sitting? 

[dago]

I normally use petrol if it doesn't leak after about 30 seconds you're fine , water  I'd probably leave for a few minutes

[gorbys]

16 minutes ago, dago said:

I normally use petrol if it doesn't leak after about 30 seconds you're fine , water  I'd probably leave for a few minutes

Oh, I fucked up a little bit then as I've left it for the last hour 

There was some moisture in the exhaust ports. But yeah, it's sat for the last hour so. Probably not that bad 

[TonyGee]

water has a skin so could mask a leak, you need something thinner. 

[gorbys]

I tested again today with good success but then idiot me managed to snap a piston ring when removing them so time to learn how to hone cylinders as well I guess and buy some new piston rings... And off course everything is closed now because some long haired hippie died two thousand years ago.... 

[TonyGee]

blasphemer