Poll: Who re-tunes their new saw after break-in?

[TimberCutterDartmoor]

Modern autotuners excepted, just wondering who actually has their saw re-tuned after the typically lean run-in period?

 

I've always done it (or had it done by Legend Kev at Radmore & Tucker) and rarely do it after that. IMO a post run-in re-tune is worth every penny; saw runs sweeter and lasts longer.

[Matthew Storrs]

im afraid i just stick standard mix in and be gentle with it for first 20hrs roughly then just use as normal, all mine seem to run fine despite not having a retune.

[spudulike]

I have never owned a new saw but have noted that there is a distinct change in a saw after it has had a few tanks through it after having new pistons fitted.

 

Compression rises, the idle changes and the top end revs change. Manufacturers will tune the top end to be a bit rich as I do when fitting a new piston but a retune after 20 tanks should really be done to ensure correct running.

[blazer]

Yep - well since I brought a tiny tacho. When I fitted an twin port exhast to my MS460. I had to remove the resistrictors and retune, both hi/lo + tickover of course. It really produces more power but drinks alot more fuel - if I had just fitted the twin port and run it I would had been posting a 'dear Spud' post.

 

I brought my son one of the last MS200T, after breakin I retuned it. Compared to the other MS200T he uses at work, his saw revs lower (14k) but produces more torque, meaning the other saws he uses are over revving and running lean.

 

For me I can see how you can 'tune by ear' without a tacho, when you have no reference of what 14K against 15k sounds like.

[Marc Lewis]

I always thought that the factory settings were v good and that you should keep these for as long as possible. Very interesting for me to hear these views (always learning) especially from the likes of spud. Would be interested to see how mine runs with some tinkering

[spudulike]

The factory settings are a starting point and good base settings but once the saw has seen some life it is quite normal for saws to need a bit of a tweak to get them to run to their full potential.

 

When saws are ported or have their mufflers modded, many think the saw will need to be richened but normally they need leaning up as the extra flow through the saw actually increases the pull through the carb and pulls more fuel through the jets - 3/4 turn on the H screw is quite common on my ported saws set by tuning the H screw, listening for four stroking and also looking at the plug colour.