2008 problems...PLEASE HELP

[Kitcheneater]

nopr just ride normal....nothing crazy. ran fine one day and horrible the next...

 

[RedFalco]

anything is possible.. next you/they have to perform a "leakdown" test. this will test the health of THAT cylinder and the rest.

basics of the test.. requires a kit, air compressor. wrist watch.

come to TDC on the cylinder being tested.. during the combustion stroke the all the valves are closed allowing you to pressurize the cylinder

once its pressurized the kit will tell you how long it should hold pressure for. the service manual may touch on this also. I can't see/check the manual with my phone Sry.

then listen: if air is escaping u cab hear it at the exhaust or the oil fill cap.. place Ur hand over the hole for a few seconds allowing pressure to build behind your hand. when u remove it, if your hear a hiss or a pisst then your valves are leaking AIR.

IF no sound of air at either end then your piston rings could be bad. at 7k its not likely.

check anyway: back to compression testing. place 2cap fills of oil into the cylinder via the spark plug hole. redo the compression test. if psi change dramaticly then piston rings and maybe sleeve damage.

Check and adjust valves.. repeat testing

remove head. visually check cylinders/pistons for damage

piston damage can easily happen when hot rodding a cold motor..

valves: so many things can go wrong with them: cams, cam chain, tensioner, springs, seats, shims, debris and on and on.

I got my leak down kit from harbor freight cheap as well as my compression tester.. they both work well.

goodluck.

Sent from my HERO200 using Tapatalk

My apologies for my stupidness in not understanding and this thread resurection; fixing to pick up a leak down tester and perform this test along w/ compression test in the next week or so. ( [problem] bubbling coolent resivour when hot) Been researching this topic for a few weeks / months now. Need to clarify as to what is meant by the statement above; i.e....."come to TDC on the cylinder being tested". Not understanding the "TDC" abbreviation. And to clarify, 10mm adapter for spark plug hole?
Thank you so much in advance.

 

[rockethead]

Top Dead Center budnot sure on plug socket..

 

[majestic12]

Not sure on the spark plug. If you take the spark plug to a hardware store like ACE they have a panel you can check the size and thread pitch.

 

[RedFalco]

ty... You guys rule!!