Zongshen timing chain - Page 4

NW1 · 02-03-2014, 05:06 PM

When installing the automatic cam chain tensioner what pressure should i initially set it at ?

SpudRider · 02-03-2014, 05:23 PM

Quote:

Originally Posted by NW1

When installing the automatic cam chain tensioner what pressure should i initially set it at ?

You must fully retract the plunger of the ACCT before you install it. You should be able to remove the end cap, and insert a screwdriver inside the ACCT. Turning the screwdriver clockwise will retract the plunger. While keeping the plunger retracted, install the ACCT. Tighten the mounting bolts, and only then release the plunger. Finally, you can re-install the endcap on the ACCT. Technically, the engine should be at TDC when you install the ACCT.

After you properly install the ACCT, you should check the valve clearances. Do you have a manual for your bike? Do you know where the alignment mark for the cam sprocket is located on the cylinder head? Please post some closeup photographs of the cam sprocket and the cylinder head.

Weldangrind · 02-03-2014, 08:28 PM

Spud has given you excellent guidance, as usual.

I'll add that the hash marks on the cam gear line up with the valve cover to head line, as you suspected. With the tensioner in place and properly adjusted, the hash markes should be in line with the valve cover gasket, and the T line should be visible through the inspection hole.

It is possible that the cam chain jumped a tooth when the tensioner went south, so it should be carefully checked.

NW1 · 02-04-2014, 12:03 AM

Everythings re-installed with new tensioner spring, piston at TDC, cam sprocket dot alligning with V notch on head (as pictured), flywheel mark visible through window (also pictured) and engine rotates with kik starter.

I now have to readup on checking the valve clearances. I dont have a torque wrench to get into the head for this so it may be a little while till my next post.

Thanks for the help so far.

SpudRider · 02-04-2014, 12:19 AM

You don't need a torque wrench to adjust the valve lash. Follow the procedure in the threads I listed, and you will do well.

NW1 · 02-04-2014, 12:51 AM

PS the pitbike frame has year 2000 so this zongshen 250cc engine is probably 2000.

02-03-2014, 08:28 PM	#48
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Spud has given you excellent guidance, as usual. I'll add that the hash marks on the cam gear line up with the valve cover to head line, as you suspected. With the tensioner in place and properly adjusted, the hash markes should be in line with the valve cover gasket, and the T line should be visible through the inspection hole. It is possible that the cam chain jumped a tooth when the tensioner went south, so it should be carefully checked. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

02-04-2014, 12:19 AM	#50
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	You don't need a torque wrench to adjust the valve lash. Follow the procedure in the threads I listed, and you will do well. __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
	0

02-03-2014, 05:06 PM	#46
NW1 Join Date: Jan 2014 Location: Byron Bay, Australia Posts: 23	When installing the automatic cam chain tensioner what pressure should i initially set it at ?
	0

02-04-2014, 12:51 AM	#51
NW1 Join Date: Jan 2014 Location: Byron Bay, Australia Posts: 23	PS the pitbike frame has year 2000 so this zongshen 250cc engine is probably 2000.
	0