TOPIC:

Here

I mean piston one two are clean not much carbon think it could be my coils or piston rings lined up cause 3 and 4 perfect carbon build up

Well number two wasn't firing due to the gap being closed. As for the rest I could be a number of things (carburetors, ignition, rings even was it on the center stand or side stand when ran). Going back to the plug what does the inside of the head look like with the plugs in?

I'll take pic when get home but first thing gonna do is see if I can get a needle between cylinder wall and ring to find were the gap is their new rings and had it honned Mabey they shifted and lining up also had some oil on the headgasket Mabey was creating a leak between one and two find out soon

Koloj,
I notice you're all over the map with your 'problem', first it's a damaged plug now you're talking about why there's no carbon build up on the piston and if the rings are lined up properly.

Do us all a favor, take a step back, post your 'problems' in a clear thought out manner and we might be able to help you better.

Here's the thing, we're not standing over the bike, you are, everything we suggest is a educated guess based on the info you provide.

My mistake plug was closed so I made a Web of possible problems... Going on one earlier post guy said look in the spark plug hole see if the piston was hitting it.. Strange thing was their was oil in the cylinder and on the piston couldn't tell... So I removed the head to check if indeed was hitting the piston it was not no marks on the piston or valves...So from the oil on the piston I came to think.. Might be blowby oil getting past rings wasn't the problem....So basically the bad spark plug helped me find a problem which could of damage my engine badly if I didn't take care of it.. Tried different spark plug and was fine didn't close...So from here only thing I can think of is new plugs wires and coil packs cause ones I have are original...I don't mean to go off subject...

Koloj, the very last thing you want to do if pull the head off an engine. That being said, you mentioned the engine was re-built, was the work done by you?

I'm stressed reading your post, primarily for the reason that your bike needs to be safe to ride. Fixing engine problems is part of owning a good old bike, however it's best to test and fix one thing at a time. Otherwise you will never understand what is causing the problem.

Using the correct spark plugs, testing coils and wires is an easy job. If that isn't the problem then I would move to the next thing.

If there is something hitting the spark plug, making it close, then you have a serious engine problem. I'm hoping you have a spark plug that is too long in the #2.

Take the spark plug out of #1 and switch it with #2. If the problem happens on #1 then you know it's the plug.

Oh wait, I forgot you took the engine apart!!!!!

since you have the head off, have you looked at the plugs while they are in the head to see if 1 is father in then the others?

It's back together I have a bobber and only have 50 Miles on I put the head gasket on drie I did put another plug in it and with careful wrenching found my head gasket may of been leaking so was good thing to take the head off... It just takes time yes I rebuilt it fixing one thing at a time...I ordered new coil packs and plugs only thing left I haven't replaced so hopefully goes well

Different plug didn't close so must of had a bad plug

they may have had the wrong plug in the box when you got it

I don't see any way a piston could hit the plug on a 750 four.
'But", something lodged on top of the piston very well might.

Get one of those fancy bore scopes and take a look at the top of the piston. Or maybe a pen light and look through the plug hole.


Or just ignore me altogether because I didn't realize there was a page 2, and the problem solved.