Airbox delete on a 4v k100, understanding

[Laitch]

Here is a video of it's first startup after the build.

Do you know what is causing the low-pitched, rhythmic knock I hear as the mic is passing over the tank between 0:05 and 0:10? Does it stop when the engine revs increase.

[Kaos]

Power dwarfs with a hammer. I suggest you remove them

[Laitch]

Power dwarfs with a hammer. I suggest you remove them

Only one hammer? They're sharing resources and saving the planet, bless their little hearts!

[Kaos]

Only one hammer? They're sharing resources and saving the planet, bless their little hearts!

Bless the dwarfs!

Anywho. My best guess based on really not much to go with is the camshaft pushing the valve tops of the exhaust valves since theyre synced with the exhaust puffing. Why and how, i dont know. Maybe a lack of lubrication on that side.
Id advice would be to find the sound origin yourself and film that, maybe even with some throttle usage to see if it speeds up.

[Kaos]

Sometimes i do English.

[Reinier]

Try paying for the wedding and hosting it in your own garden.

If you mean the gastank with " the can"  then yes Candy Apple red with a 2k clear coat.
I still don't know what to do with the fenders. But i'll figure it out.
The battery is an Ultrabatt in the saddle

[Kaos]

No I meant the monster can. The glowing orb in the sky tends to bleach a soda can.
But. What I was Wondering, did you find the origin of the rythmic knock? And was it the camshaft?

[Reinier]

I did nothing to the can. The sun is not that harsh here. And the can is easily replaced.
The sound is still there. The valves are all within specs. Compression is similar on all cylinders.
The only thing I can find is lower intake vacuüm on cylinder 3 but I can not find a leak.
So synchronisatie is not complete and everyone says that might be the issue.

[Kaos]

I am aware of what the sun can do "here" :) I live "here" too.
Of sync, as in timing not being correct?
The leak might be in the boot, the intake manifold mounted to the engine.

[Reinier]

I tried the brake cleaner test on the boot but it did not have any effect

[Kaos]

Have you checked the valve shims? Those nice slippery caps that function like punching bags for the camshaft.
Another option is to remove the camshaft cover,
Have the bike in neutral and manually turn the engine using the hexnut in the timing housing to find the origin

[Reinier]

A K1100 does not have shims but buckets. A lot more hassel and expensive to replace. But I checked them and it all looks like new and the distances are consistent and in spec.
Timing I did not check that. Should be ok. The only timing related thing I have loose is the hall-sensor because you need to remove that to remove the timing cover for painting. The chain and tension er look in good condition. I will look into that further coming week.