Chinese 125

dcd1979 · Derestricted Danger Joined: 19 Sep 2015 Karma :

Hi I have a Chinese vulcan 125 custom, I have recently changed the head due to a broken exhaust port and since putting it back together it seems to be rattling, I am unsure if it is the tappets as I can't seem to find the settings anywhere, any advice appreciated

Dave

Polarbear · Super Spammer Joined: 24 Feb 2007 Karma :

Without googling, off the top of my head for generic clearances, tappets 0.2 inlet, 0.3 exhaust? Should do till you get the proper distances.
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Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

Is it OHC or pushrod?
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

It's the pushrod CG125 copyengine, so 0.08mm for both, or ~~four~~ three thousandths of an inch in old money.
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dcd1979 · Derestricted Danger Joined: 19 Sep 2015 Karma :

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Wild thought, do the oilways match up perfectly and is the head getting lubricated? I wonder how long a pushrod head will run without lubrication. Thinking

____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

dcd1979 · Derestricted Danger Joined: 19 Sep 2015 Karma :

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

If it's a metallic ticking noise, then the problem is likely to be the exhaust gasket. Doubly so if you didn't replace it when you changed the head.

dcd1979 · Derestricted Danger Joined: 19 Sep 2015 Karma :

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

You did do them at TDC on the compression stroke and not the overlap stroke?
You wouldn't be the first to get that wrong if you did
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dcd1979 · Derestricted Danger Joined: 19 Sep 2015 Karma :

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

Most bike have a TDC pointer but to ensure you're on the correct stroke
I'll watch the inlet rocker as I slowly turn the motor in its normal running direction with the plug out
and maybe ( carefully!) use something down the plug hole if I can't watch the piston.

When you see the inlet rocker move to open its valve and the piston moves downwards you're on the induction stroke.

When you see the rocker/valve close and piston starts upwards
that's the compression stroke so you then continue carefully until it reaches TDC.
there will usually be some corresponding marks on the flywheel to
help determine exact TDC.
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Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

If you do poke things down your cylinder (and there is nothing wrong with doing so) make sure it is a pencil. My mate phoned me to say he had trapped a pencil with the piston and snapped it off and wanted to know what to do, I told him to just start it up. He did and other than a few sparks coming out of the pipe it did no harm.
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Bikers make great organ donors, get 115 on your licence today.