Re: O.T. tach for chainsaw?
 

Hmmm a 4 stroke sound. Is that like when it's
sorta flooding out? Like putting the choke on
I plan on buying a new bar and chain for it
Maybe they'll put a tach on it for me if I do buy
the bar+chain. The local small engine shop I use
are pretty darn good. For parts anyway...

John Sevey wrote:

> FrankW <fworm@mxznorpak.ca> wrote:
>
>>After rebuilding the carb for my little Homelite chainsaw.
>>I needed to readjust the hi and lo jets.
>>The lo jet was easy enough but to adjust the hi speed jet
>>the manual says to adjust to 11,000 - 11,500 rpm.
>>What kind of tool do you use to measure the rpm?
>
>
> You'd need something like this:
>
> http://www.mfgsupply.com/m/c/32-9073.html
>
> But since you probably don't have one of those or can justify the price, you
> can probably do the following:
>
> At WOT, keep turning the high speed jet richer until the saw "four-cycles".
>
> This is a distinctive sound that a 2-cycle engine makes when it is running too
> rich. You'll know it when you hear it.
>
> Then, turn the high speed jet leaner until the "four-cycle" sound just goes
> away.
>
> Or just stop by a local small engine shop. They probably have a tach like
> the one mentioned above and would probably be willing to adjust the carb for
> you for nothing, or perhaps a beer...
>
> :)
>
> -John

Re: O.T. tach for chainsaw?
 

Hmmm a 4 stroke sound. Is that like when it's
sorta flooding out? Like putting the choke on
I plan on buying a new bar and chain for it
Maybe they'll put a tach on it for me if I do buy
the bar+chain. The local small engine shop I use
are pretty darn good. For parts anyway...

John Sevey wrote:

> FrankW <fworm@mxznorpak.ca> wrote:
>
>>After rebuilding the carb for my little Homelite chainsaw.
>>I needed to readjust the hi and lo jets.
>>The lo jet was easy enough but to adjust the hi speed jet
>>the manual says to adjust to 11,000 - 11,500 rpm.
>>What kind of tool do you use to measure the rpm?
>
>
> You'd need something like this:
>
> http://www.mfgsupply.com/m/c/32-9073.html
>
> But since you probably don't have one of those or can justify the price, you
> can probably do the following:
>
> At WOT, keep turning the high speed jet richer until the saw "four-cycles".
>
> This is a distinctive sound that a 2-cycle engine makes when it is running too
> rich. You'll know it when you hear it.
>
> Then, turn the high speed jet leaner until the "four-cycle" sound just goes
> away.
>
> Or just stop by a local small engine shop. They probably have a tach like
> the one mentioned above and would probably be willing to adjust the carb for
> you for nothing, or perhaps a beer...
>
> :)
>
> -John

Re: O.T. tach for chainsaw?
 

Hey!!!!!!!
It's not supposed to be funny

Well actually, yes it is. ;-)
Cheers
Frank

Kate wrote:

> "FrankW" <fworm@mxznorpak.ca> wrote in message
> news:npSdnW0BkujsJbPeRVn-gg@magma.ca...
> : Hello Group.
> :*snip*
> : Frank .....lousy mechanic.....worse plumber
>
>
> LMAO!

Re: O.T. tach for chainsaw?
 

Hey!!!!!!!
It's not supposed to be funny

Well actually, yes it is. ;-)
Cheers
Frank

Kate wrote:

> "FrankW" <fworm@mxznorpak.ca> wrote in message
> news:npSdnW0BkujsJbPeRVn-gg@magma.ca...
> : Hello Group.
> :*snip*
> : Frank .....lousy mechanic.....worse plumber
>
>
> LMAO!

Re: O.T. tach for chainsaw?
 

Hey!!!!!!!
It's not supposed to be funny

Well actually, yes it is. ;-)
Cheers
Frank

Kate wrote:

> "FrankW" <fworm@mxznorpak.ca> wrote in message
> news:npSdnW0BkujsJbPeRVn-gg@magma.ca...
> : Hello Group.
> :*snip*
> : Frank .....lousy mechanic.....worse plumber
>
>
> LMAO!

Re: O.T. tach for chainsaw?
 

>>>>FrankW wrote:
>>>>
>>>>
>>>>>Hello Group.
>>>>>After rebuilding the carb for my little Homelite chainsaw.
>>>>>I needed to readjust the hi and lo jets.
>>>>>The lo jet was easy enough but to adjust the hi speed jet
>>>>>the manual says to adjust to 11,000 - 11,500 rpm.
>>>>>What kind of tool do you use to measure the rpm?
>>>>>Thanks in advance.
>>>>>Frank .....lousy mechanic.....worse plumber

A small engine shop will use a wireless tach to set the main mixture -
you can buy either a digital or analog unit and just hold it near the
engine to pick up the sound impulses. It is a very quick and accurate
way to set the mixture. If you decide to get a digital tach, get one
that updates the reading frequently - some take more than 2 seconds to
change readings and that is not good.

Here is one I found with a Google search:

http://www.learnsmallenginerepair.com/tach.htm

You do NOT want to mount a tach permanently on your chainsaw, since it
will self destruct from vibration.

It is simple enough to set the mixture by ear - run the warmed up saw
at WOT and slowly turn the main mixture screw towards rich. The saw
will start to slow and eventually will blubber (4 stroke). Turn the
mixture towards lean and it will pick up and start to run clean. It is
very hard to tell 10K from 11 K rpm by ear - just play with the
setting a little at a time until you find a setting where the saw cuts
well without bogging down. If it seems to lack power, lean it out a
little more (no more than 1/8 turn at a time).

ALWAYS err on the rich side - running lean can seize the piston!

If this doesn't make sense. take the saw to a shop and watch them set
it - then you can duplicate the process.

John Davies
Spokane WA

Re: O.T. tach for chainsaw?
 

>>>>FrankW wrote:
>>>>
>>>>
>>>>>Hello Group.
>>>>>After rebuilding the carb for my little Homelite chainsaw.
>>>>>I needed to readjust the hi and lo jets.
>>>>>The lo jet was easy enough but to adjust the hi speed jet
>>>>>the manual says to adjust to 11,000 - 11,500 rpm.
>>>>>What kind of tool do you use to measure the rpm?
>>>>>Thanks in advance.
>>>>>Frank .....lousy mechanic.....worse plumber

A small engine shop will use a wireless tach to set the main mixture -
you can buy either a digital or analog unit and just hold it near the
engine to pick up the sound impulses. It is a very quick and accurate
way to set the mixture. If you decide to get a digital tach, get one
that updates the reading frequently - some take more than 2 seconds to
change readings and that is not good.

Here is one I found with a Google search:

http://www.learnsmallenginerepair.com/tach.htm

You do NOT want to mount a tach permanently on your chainsaw, since it
will self destruct from vibration.

It is simple enough to set the mixture by ear - run the warmed up saw
at WOT and slowly turn the main mixture screw towards rich. The saw
will start to slow and eventually will blubber (4 stroke). Turn the
mixture towards lean and it will pick up and start to run clean. It is
very hard to tell 10K from 11 K rpm by ear - just play with the
setting a little at a time until you find a setting where the saw cuts
well without bogging down. If it seems to lack power, lean it out a
little more (no more than 1/8 turn at a time).

ALWAYS err on the rich side - running lean can seize the piston!

If this doesn't make sense. take the saw to a shop and watch them set
it - then you can duplicate the process.

John Davies
Spokane WA

Re: O.T. tach for chainsaw?
 

>>>>FrankW wrote:
>>>>
>>>>
>>>>>Hello Group.
>>>>>After rebuilding the carb for my little Homelite chainsaw.
>>>>>I needed to readjust the hi and lo jets.
>>>>>The lo jet was easy enough but to adjust the hi speed jet
>>>>>the manual says to adjust to 11,000 - 11,500 rpm.
>>>>>What kind of tool do you use to measure the rpm?
>>>>>Thanks in advance.
>>>>>Frank .....lousy mechanic.....worse plumber

A small engine shop will use a wireless tach to set the main mixture -
you can buy either a digital or analog unit and just hold it near the
engine to pick up the sound impulses. It is a very quick and accurate
way to set the mixture. If you decide to get a digital tach, get one
that updates the reading frequently - some take more than 2 seconds to
change readings and that is not good.

Here is one I found with a Google search:

http://www.learnsmallenginerepair.com/tach.htm

You do NOT want to mount a tach permanently on your chainsaw, since it
will self destruct from vibration.

It is simple enough to set the mixture by ear - run the warmed up saw
at WOT and slowly turn the main mixture screw towards rich. The saw
will start to slow and eventually will blubber (4 stroke). Turn the
mixture towards lean and it will pick up and start to run clean. It is
very hard to tell 10K from 11 K rpm by ear - just play with the
setting a little at a time until you find a setting where the saw cuts
well without bogging down. If it seems to lack power, lean it out a
little more (no more than 1/8 turn at a time).

ALWAYS err on the rich side - running lean can seize the piston!

If this doesn't make sense. take the saw to a shop and watch them set
it - then you can duplicate the process.

John Davies
Spokane WA

Re: O.T. tach for chainsaw?
 

Been using one for years

http://www.mfgsupply.com/m/c/32-9073.html

--
Coasty

Remove the SPOOGE to reply
"FrankW" <fworm@mxznorpak.ca> wrote in message
news:npSdnW0BkujsJbPeRVn-gg@magma.ca...
> Hello Group.
> After rebuilding the carb for my little Homelite chainsaw.
> I needed to readjust the hi and lo jets.
> The lo jet was easy enough but to adjust the hi speed jet
> the manual says to adjust to 11,000 - 11,500 rpm.
> What kind of tool do you use to measure the rpm?
> Thanks in advance.
> Frank .....lousy mechanic.....worse plumber
>

Re: O.T. tach for chainsaw?
 

Been using one for years

http://www.mfgsupply.com/m/c/32-9073.html

--
Coasty

Remove the SPOOGE to reply
"FrankW" <fworm@mxznorpak.ca> wrote in message
news:npSdnW0BkujsJbPeRVn-gg@magma.ca...
> Hello Group.
> After rebuilding the carb for my little Homelite chainsaw.
> I needed to readjust the hi and lo jets.
> The lo jet was easy enough but to adjust the hi speed jet
> the manual says to adjust to 11,000 - 11,500 rpm.
> What kind of tool do you use to measure the rpm?
> Thanks in advance.
> Frank .....lousy mechanic.....worse plumber
>