How to check rpm

[Kevm]

How do you physically check a saws RPM, I can't see how you could do it with the chain on and without the chain do you get a true reading.

I have a "new to me" husky 262 and want to set it up better, in the manual it says don't run the saw without the bar, chain and brake cover as the clutch can come loose.

I can't really see why it would come loose.

I have a old fashioned mechanical tachometer with a rubber nose I can hold against the centre of the clutch, is that ok?

Kev

[bobh]

Tinytach will do just what you want, I use the fast tach

http://www.tinytachuk.com/HHnew.php

[spudulike]

I use a TT20K Tiny Tach, US built and is invaluable for Chainsaw technicians.

 

If you have had the clutch off a machine and use the saw without a chain and bar on it, the clutch can spin off and if you are unlucky, could hit you or just spring apart. I have had one or two go, one quite spectacularly and took me two hours to find the parts

 

I generally torque them where possible or run the machine flat out and slap the chain brake on a few times to tighten them as some don't have hex heads in the centre.

[humpo48]

I use a Stihl tachometer, you attach it to the HT lead. Works well but a bit pricey. There are cheaper ones on eBay

 

 

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[Kevm]

The clutch hasn't been apart, so is there any reason why I can't just stick the tacho on the end of the shaft?

Kev

[Stubby]

I think the tachometer mentioned here count the spark impulses as you aim them at the plug top . Could be wrong ...........

[humpo48]

I think the tachometer mentioned here count the spark impulses as you aim them at the plug top . Could be wrong ...........

 

 

Yea that's how I measure the revs attach at the top. Is there another way to do it out of interest Stubby?

 

 

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[Stubby]

Yea that's how I measure the revs attach at the top. Is there another way to do it out of interest Stubby?

 

 

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I was replying to kevm when he posted " can I just attach it to the fly wheel " I think he was referring to the mechanical type that spins . It has a conical point that locates in a female cone on the end of the shaft ( crank shaft ) .

 

The one I have seen has no connection at all . Just point it at the plug cap and press the button .

[bobh]

I was replying to kevm when he posted " can I just attach it to the fly wheel " I think he was referring to the mechanical type that spins . It has a conical point that locates in a female cone on the end of the shaft ( crank shaft ) .

 

The one I have seen has no connection at all . Just point it at the plug cap and press the button .

 

Yep, thats the one I linked to. Totally wireless, just point it at the plug/ht lead and it gives you the revs. A lot less messing about.

[humpo48]

I was replying to kevm when he posted " can I just attach it to the fly wheel " I think he was referring to the mechanical type that spins . It has a conical point that locates in a female cone on the end of the shaft ( crank shaft ) .

 

 

 

The one I have seen has no connection at all . Just point it at the plug cap and press the button .

 

 

Cool stubs

 

 

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