Performance parts

[jimjr21]

Just got my prototype valves in.
Next up flow bench testing, then dyno.

More goodies on the way.

[Weldangrind]

What are the valves made of?

[jimjr21]

Forged stainless steel

[Weldangrind]

Are you planning anything over the top, like a five angle cut?

[jimjr21]

1,3, 5, radius are all the same effort. Just change the cutter.

I have a Sunnen VGS-20 in the shop. Makes this operation so easy.

[SpudRider]

Very nice, Jim.

[Weldangrind]

Originally Posted by jimjr21

1,3, 5, radius are all the same effort. Just change the cutter.

I have a Sunnen VGS-20 in the shop. Makes this operation so easy.

I would love to have access to a wonderful toy like that!

[Co2]

Nice project but..?

1 year ago , read my moto " owner manual " said after 1000 km check and adjust valves , totaly my fault.

Good but " owner manual " not added valves clearences , later i search surf on internet universe

Documental a video (or a user said, i forget,) same type zs177mm said 0.15 mm exhaust , 0.10 mm intake

And i get that settings , cam shaft signs is ok , topdead is ok , sett after performance is down , and urgent need 100 kilometer range drive wrong values total 200 kilometer but on road request high performance ı used my moto full thortle.

And happy end....... motocycle electrick start is ok non problem , but kick start isnt work... later hard start too electric to.

Checking my intake valve example, old.. (damaged up valve, down valve is my reserve/replecament valve intake it normal)



Damaged valve left side.





On pictures maybe hard seeing, but on eye and hand control disaster sharp same a razor damage. and dimension smallest corosion.

İ just remending , my fault big fault, extreme drive = but my moto material (metalurjic valve smooth) tolerated my fault and save me better or heavy damaged my motor or cyclinder head.

İ think if u used better hard steel material on our modift, moto cyclender head maybe cant tolareted any failed..

(Tarzan style lang is awesome : ) ) i hope understand me

[SpudRider]

The valve lash for the ZS177MM/NC250 engine is as follows.

Intake Valve: 0.04 - 0.06mm
Exhaust Valve: 0.04 - 0.06mm

[jimjr21]

Co2,

Are you saying the valve face was damaged from too much clearance?

Or some other issue?

[Co2]

Originally Posted by SpudRider

The valve lash for the ZS177MM/NC250 engine is as follows.

Intake Valve: 0.04 - 0.06mm
Exhaust Valve: 0.04 - 0.06mm

Yes , me too learned that values after damaged my valves ^^ , again thanks livingcebuforum and mr.david aisawing + crossfire moto company same ansvered me.

İ hope on this forum to , any other problems solved, and helped together

[Co2]

Originally Posted by jimjr21

Co2,

Are you saying the valve face was damaged from too much clearance?

Or some other issue?

" Are you saying the valve face was damaged from too much clearance? "

too much clearance + our modfy new valve , maybe better hard steel , any a fault on valve sett = hard material valve heavy damage our moto cylender head damage.


Yes , i later learned that clearenced 0.04 mm , 0 .06 mm , and i posted on Turkiye forum of motosiklet.net/ my moto topc = http://www.motosiklet.net/forum/moto...m-basligi.html

And coming many posts said interesting very tight values,impossible,bla bla bla , but all forget metalurjy is on techno age, and this motor tight tolerance high compression , and this moto is " water cooled ". i think all mixed old version air cooler moto type clearences.

İ learn this, but learn price is expensive for me^^

Note ; maybe versions is different idk , my moto is zs177mm 5 gear and carburator version, maybe different EFİ zs177mm idk.

[Adjuster]

I can see the honed razor sharp edge at the top of his valves. The metal is beat so thin it is falling off.



/

[SpudRider]

Originally Posted by Co2

...Note ; maybe versions is different idk , my moto is zs177mm 5 gear and carburator version, maybe different EFİ zs177mm idk.

The valve lash specifications are the same for both versions of the ZS177MM/NC250 engine, whether the engine has a carburetor, or EFI.

[SpudRider]

Originally Posted by Adjuster

I can see the honed razor sharp edge at the top of his valves. The metal is beat so thin it is falling off.



/

Yes, that is a case of major valve recession.