Topic: Ticking sound

[Wredas]

Hi everyone,

First of all I feel privileged to be able to ask knowledgeable people like you across the globe for tips. It's truly amazing for someone like me without any expertise close by ... Well anyway ...

I wonder if you could help me diagnose this clicking sound. I'm thinking of purchasing it, but not really sure what I'm getting myself into. Some information

- Cam chain is 2 years old, as well as piston rings, (not sure about cam chain tensioner)
- Dynatek ignition
- It doesn't run well on high revs, carb jets size 130 apparently

I wonder if the valves needs to be adjusted, or the cam chain tensioner. However since it was rebuilt about 2 years ago, I'm not sure if that should be the case.

What do you think, can it be bad? Should I skip it?

Video here:
https://youtube.com/shorts/MkjE1BYXJTc 

[bryanj]

Cant watch videos so WHAT BIKE

[Wredas]

Cant watch videos so WHAT BIKE

Sorry - uploaded to Youtube, see if this works https://youtube.com/shorts/MkjE1BYXJTc

[scottly]

That 750 sounds a bit rough to me. It could be several things, like not running evenly on all 4 cylinders to a very loose tappet to exhaust leaks

[Wredas]

That 750 sounds a bit rough to me. It could be several things, like not running evenly on all 4 cylinders to a very loose tappet to exhaust leaks

Right, thanks, sounds reasonable. I don't have any experience with the Dynatek ignition but could be something there I guess as well. 

[HondaMan]

That 750 sounds a bit rough to me. It could be several things, like not running evenly on all 4 cylinders to a very loose tappet to exhaust leaks

Right, thanks, sounds reasonable. I don't have any experience with the Dynatek ignition but could be something there I guess as well. 

The biggest issue with the Dynatek is: it uses a great deal of power. The bikes usually then have low-battery problems unless they are driven primarily out on the hiway: below 3300 RPM the battery is constantly discharging with those units installed.

The clattering sounds like a very loose cam chain, plus possibly loose lifters (not adjusted properly). This could possibly include a damaged cam if the top end was run without oil for some reason, which can happen after a top-end rebuild gone 'wrong'. I'd suggest inspecting it for loose lifters and adjust the cam chain, then try running it to see if it quiets down some?

[M 750K6]

Was it being used without any air filters? Personally, I wouldn't touch it, if it's done serious mileage without an air filter.

[CycleRanger]

At the very least it needs the tappets adjusted and tensioner checked. It might quite down after that.  If not, then it's got more serious issues.
Probably should check the carb sync as well.
It needs an air filter too.

[Wredas]

That 750 sounds a bit rough to me. It could be several things, like not running evenly on all 4 cylinders to a very loose tappet to exhaust leaks

Right, thanks, sounds reasonable. I don't have any experience with the Dynatek ignition but could be something there I guess as well. 

The biggest issue with the Dynatek is: it uses a great deal of power. The bikes usually then have low-battery problems unless they are driven primarily out on the hiway: below 3300 RPM the battery is constantly discharging with those units installed.

The clattering sounds like a very loose cam chain, plus possibly loose lifters (not adjusted properly). This could possibly include a damaged cam if the top end was run without oil for some reason, which can happen after a top-end rebuild gone 'wrong'. I'd suggest inspecting it for loose lifters and adjust the cam chain, then try running it to see if it quiets down some?

Damn, well I haven't bought it and it's quite a drive to go check it, so I feel like skipping. Thanks.

Was it being used without any air filters? Personally, I wouldn't touch it, if it's done serious mileage without an air filter.

Good spotting. They were supposedly being cleaned.

At the very least it needs the tappets adjusted and tensioner checked. It might quite down after that.  If not, then it's got more serious issues.
Probably should check the carb sync as well.
It needs an air filter too.

Right, thanks. Sounds like a risk, so I will probably skip it. It also confuses me why it runs so bad now, since it was supposedly running well a few years ago, no bad sounds and revved out well, so something must've changed. Current owner doesn't have much info.

Thanks everyone! 

[newday777]

"since it was supposedly running well a few years ago"
Ah yes,  the "it ran when parked" sales pitch to make it appear to be a viable purchase at a high price.
These bikes need to not be neglected, leaving them to sit in a damp environment and not kicked over at the least every few months and having fresh oil change before stored and things start going south in short time.
The ticking could be a valve adjuster nut come loose from not having been torqued properly by a rookie,  or worse??? Until you start checking things you won't know.
So you don't own the bike? Just considering buying it? Did you take the video?

[Wredas]

"since it was supposedly running well a few years ago"
Ah yes,  the "it ran when parked" sales pitch to make it appear to be a viable purchase at a high price.
These bikes need to not be neglected, leaving them to sit in a damp environment and not kicked over at the least every few months and having fresh oil change before stored and things start going south in short time.
The ticking could be a valve adjuster nut come loose from not having been torqued properly by a rookie,  or worse??? Until you start checking things you won't know.
So you don't own the bike? Just considering buying it? Did you take the video?

Right, makes sense. Thanks. No, I don't own the bike, I'm thinking of purchasing it, but not very keen any more, I'm in no rush so I can wait until a more suitable one pops up. I did not take the video, the owner did.

[cooldrum]

Wredas, You said you are in no rush and could wait for a more suitable 750 to pop up.  Then be patient and keep looking. There are many well cared for ones out there.  Yes, you may pay a bit more and it will be worth it.  Our 750's need to ridden regularly and looked after.  I suggest finding one that is in  stock condition, then you have options of how you want to modify it or keep it stock to ride and enjoy.  good luck!

[Tracksnblades1]

"since it was supposedly running well a few years ago"
Ah yes,  the "it ran when parked" sales pitch to make it appear to be a viable purchase at a high price.
These bikes need to not be neglected, leaving them to sit in a damp environment and not kicked over at the least every few months and having fresh oil change before stored and things start going south in short time.
The ticking could be a valve adjuster nut come loose from not having been torqued properly by a rookie,  or worse??? Until you start checking things you won't know.
So you don't own the bike? Just considering buying it? Did you take the video?

Right, makes sense. Thanks. No, I don't own the bike, I'm thinking of purchasing it, but not very keen any more, I'm in no rush so I can wait until a more suitable one pops up. I did not take the video, the owner did.

If you return to the scene 🤪. Take a very slow video as far around the engine while maintaining the same distance.

With the camera moving so fast, the sound changing so much, it’s hard to determine whether it’s a rocker arm (excessive lash) problem or a broken valve spring waiting to drop it soon…

Nevertheless the less the video I saw indicates it’s more than a tick… it was loud…

[seanbarney41]

sounds just like a couple of 750's I had that were not getting oil to the valve train...if not already catastrophic to the cam and lifters it will be very soon