Tachometer

[spudulike]

Thanks Spud,

I appreciate your response The saws I have are; a stihl 660, new and two old stihl 028's that I just rebuilt with new cylinder/pistons. Do you think on the 028's I should drop the 1000k being they have new cylinders? Oh and my neighbour has a Stihl 026 he needs tuning, if you possibly know the max rpm's on these saws?

 

I was just going to take them a stihl store to get tuned but they wanted $100 each to tune! Worth buying the $85 tacho.

 

How much of a screw twist is there generally between rich and lean? It seemed more of a screw twist than I expected on the 028 to get the different sounds.

 

Do you know whether a fuel/air meter even exists for chainsaws, although I think by ear with the muffler and its restrictions still on is the better way to go.

 

Thanks

Chris

 

Right: -

 

MS660 - 13,500

026 - 14,000

028 - 12,500

 

With a new cylinder and piston, I would still tune down by 1,000rpm until 10-20 tanks have gone through.

 

You will find around +/- 1/4 turn around the factory setting makes the difference between overly rich and overly lean - most saws are similar but there are always exceptions.

 

On some older saws, you will find that adjustment of the L screw effects the H and vice versa, this is down to the construction of the carb and you will need to go back and forth on adjustments until it is right but don't go too far away from factory.

 

Last thing to be aware of, on some saws with limit caps on the H & L screw, the settings on the airbox refer to the settings WITH THE LIMIT\ CAPS ON and not with them off - I have had a couple of saws in that have seized where the owner has misread this info.

 

Typically, most carbs are factory set to 1 & 1 turn H & L screws - use as a general guideline - Husqvarna 335/338 is one exception.

[Harrybob]

Great, thanks ever so much

[spudulike]

Just read the post again - I know of no fuel air analysis equipement that you could use to tune saws, it is generally done with a tach on standard saws and a mix of tach, plug colour and cutting on ported/modified saws.

[Jamie Jones]

On 28/04/2012 at 21:21, spudulike said:

 

I got the TT-20K - very good and wireless operation - nice hold function on max revs as well and a fast refresh of 0.5 seconds. You can change the battery on this workshop model - around £75 and worth every penny IMO - takes any error out of tuning by ear and makes the tuning of the higher revving saws much easier.

 

Got the UK reps details if you are ever interested - no commercial link or otherwise between me and them:thumbup:

Hi
Can you send me the details for the UK Agent for the Tiny / Fast Tach tachometer please

[spudulike]

The UK guy has stopped supporting them, a shame as he was a reliable fella, here are the latest contacts, best contact the French fella - 

Ordering Information for International Customers | Design Technology, Inc., Home of Tiny-Tach

TINYTACH.COM

---

Information for Design Technology international orders.