[joaoadias]

Hello to all,

I have a Honda CB250 from 2001 but it is starting to make a bit of noise from, i think, the cam chain.

Is it possible to adjust manually the tensioner?

Thank you!

 

[Polish]

Welcome! I can't help since I'm not familiar with your bike, but I found a couple free PDF manuals online.

Here is one I think:

https://www.manualslib.com/manual/790406/Honda-Cb250.html#manual

 

[longdistancerider]

It appears that the tensioner isn't an adjustable type
Moved to SOHC Engine section

 

[joaoadias]

Thank you all for your replies. Here i attach a video of the actual chain where you can see the tension of it.

 

[joaoadias]

https://streamable.com/fp332

 

[longdistancerider]

The side play in the video seems a little excessive but I wouldn't be concerned really. The only possible fix would be a new cam gear and chain and it may not be any better due to the design of the gear.

 

[joaoadias]

Thanks for the reply.

I'll keep driving it as it is then.

Thank you!

 

[drydreamer]

Nice scar, wobbly chain, self adjusting ( ratchet system? ) tension by the looks of the metal "can" on rear of chain area........up and down play and lift of chain from sprocket, how much??

If flywheel set to "T", do marks on cam sprocket line parallel with rocker cover gasket face on head??, or do they "lean back" quite a bit ??

Not that well up to date on the "modern" cb250, a different animal to the old faithful cb's.

 

[joaoadias]

Thanks for the Help,

The cam marks are parallel with the engine head while on TDC. The tensioner looks like it has his days counted.

Does somebody know if the tensioner is just plug-and-play or has it some kind of adjustment? Any recommendation changing it?

Thank you!

 

[longdistancerider]

Looking at the parts microfiche there appears to be a pin the tensioner blade slips over at the bottom and there's a hairpin clip securing it. That means the top of the engine, head and cylinders, has to come off to replace. Looks to be an auto adjust mechanism so there's no manual means.

 

[joaoadias]

Is it really needed to remove the cylinders for that? Jeezz...