Honda ATV Forum banner
1 - 5 of 5 Posts

· Registered
2 Posts
Discussion Starter · #1 ·
Hi guys, long time lurker here, feel mildy bad for making an account to ask a question:|. I've been messing with my timing chain for some time now and all the relatable posts I can find often have different factors in play.

I have an 06 300ex, 305(307? cant remember) big bored, high comp piston, a cam, kibblewhite valve sprangs. It has been running great since the build about 20 hrs ago. I knew the timing was SLIGHTLY off at the time and "I'll fix in a couple weeks" turned into a year. My 2 smoker is down and waiting on parts (surprise surprise) so I figured this is the time to give the 300 some attention.

So, I've tried 2 different cam sprockets, a new chain, guides are good, tensioner feels smooth and working. Crank is OEM never opened up, head not shaved, cam bearings were replaced when I installed the cam.

Cam lobes have slight "feelable" wear gouges in them. Guess I need to bite the bullet and get some fresh rockies(or maybe the KW springs are too stiff?).

Back to I need to worry about the timing being barely off? First pic is TDC and second pick is the marks on the bottom end AFTER I aligned the top sprocket marks. Tensioner is on and tensioned. I tried my best to line up the photos for accurate representation.

Any input is appreciated, feel free to tell me I'm an idiot :icon_rolleyes:


· Premium Member
4,390 Posts
Timing chain is ever so slightly stretched. I have actually seen new timing chains be off by this much from the start. Shaky tolerances in there manufacturing process. Not enough to worry about. My .02
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.