Hello Guest User,

Please feel free to have a look around the forum but be aware that as an unregistered guest you can't see all of it and you can't post.

To access these 'Registered Users Only' areas simply register and login.

top of piston is damp ??

Need help restoring, building, or finding then try here.

Moderators: KeithZ1R, chrisu, paul doran, Taffus

Message
Author
User avatar
DAVEKWAK9?
Regular Poster
Posts: 32
Joined: 17th Nov 2024
Location: Sheffield

top of piston is damp ??

#1 PostAuthor: DAVEKWAK9? » Sun Jul 20, 2025 5:43 pm

Hi peeps could you please help not sure how it should look take the spark plug out of my 1976 z900 A4 and the top of the piston is a bit damp should it look like that or should it be bone dry runs fine apart from firing on three for a little while then fine. thanks for your help :up
Last edited by DAVEKWAK9? on Sun Jul 27, 2025 8:44 pm, edited 1 time in total.

User avatar
zed1015
Hardcore
Hardcore
Posts: 4024
Joined: 2nd Nov 2005
Location: Somewhere between Scunny and Goole.

Re: top of piston is damp ??

#2 PostAuthor: zed1015 » Sun Jul 20, 2025 5:48 pm

Could be a leaking valve stem seal causing it to run on 3 until warmed up.
The dampness would be oil assuming that's the same cylinder that is slow to fire.

User avatar
DAVEKWAK9?
Regular Poster
Posts: 32
Joined: 17th Nov 2024
Location: Sheffield

Re: top of piston is damp ??

#3 PostAuthor: DAVEKWAK9? » Sun Jul 20, 2025 6:18 pm

thank you will check :up


Return to “Bike Help”

Who is online

Users browsing this forum: Stugill and 22 guests