426 ping

[ex_freestyle]

o.k. i have a 2003 honda 426 with wiseco 11:1 comp piston stage one hot cam, cdi, rectifire, 4 degree advance timming key, titanium race valve springs, new valves, k & n air filter, curtis sparks x-6 full system, i cat, new clutch kit and ya that is about for her and i re-ajusted my valves to the right spesifications from the honda manual and every time i ride there is always a pinging sound like the valves are slapping and its starting to fusturate me cause when i let it idle it makes the sound and even when i wined it up it gets louder, this happened to me once and my piston shattered and i dont want it to happen to me again does anyone have any idea what this could be? if so can you please help me cause i slowed down lots on riding cause im scared im going to reck my engine once again and its not to fun dumping abunch of money into her and rebuilding her. thanks for the help

[m36indiana]

i had the same problem, found out i didnt use an oversize head gasket, so the piston was hitting the gasket

[JOEX]

You may need to remove the advance key. Have you tried running straight race gas aor at least a mix?

Also the HotCam has a different valve lash spec than stock.
.13mm intake
.15mm exhaust

[JOEX]

Also running the advance key with some aftermarket cdi's isn't a good idea. Not sure if the Big Gun is one of them.

[my88r]

whats your compression.
also what oil do you run??

[ex_freestyle]

i run a 11:1 wiseco 426 piston and i run 5w-30 lucas oil

[TRXRacer1]

Originally posted by JOEX
You may need to remove the advance key. That's what I'm guessing too.

[Honda#4]

^^^ X2

[bdtoady22]

sounds to me it is pre ignition pre ingition = destruction as said before remove the advance key that will retard the timing and hopefully stop the pinging. that probablly why it broke the piston the first time

[tar]

You probably need to take your advance timing key out. Also what octane gas are you running?

[REDRIDDER]

Originally posted by JOEX
You may need to remove the advance key. Have you tried running straight race gas aor at least a mix?

Also the HotCam has a different valve lash spec than stock.
.13mm intake
.15mm exhaust right on this may not solve your problem but one thing for sure is that your engine is running hotter than hell.With the i cat and the degree key your engine is making alot more heat then necessary, i also believe that the degree key isn't recommended for a big bore because of the added heat form a big bore and with the spark enhancing i cat that isn't helping either.What i think is going on is that all the extra heat is making your quad run like it was running lean.