Modified engine

[case mx270]

Right educate me please, I ve heard you guys taking about porting an engine .What does this mean how's it done what's the cost ( estimated) ? Also I heard you guys talking about other engine mods about mufflers and spark arresters ? What's that all about ? I have a Makita 9010 is this prime for modding ? Thanks Ian

[Stubby]

Removal of the spark arrestor Screen is the first simple step . Modding the muffler to make it less restrictive is the next . Porting is best left to those who know what they are doing . Spud on here has done most of my saws and Petemate has done my 560 . Look at spuds tuning and porting thread .

[mendiplogs]

Right educate me please, I ve heard you guys taking about porting an engine .What does this mean how's it done what's the cost ( estimated) ? Also I heard you guys talking about other engine mods about mufflers and spark arresters ? What's that all about ? I have a Makita 9010 is this prime for modding ? Thanks Ian

 

Hi CASE STEVE your man mate on here thanks Jon

[Pinkfoot]

That migh need deciphering .

John said.

Spud is your man

[shavey]

Right educate me please, I ve heard you guys taking about porting an engine .What does this mean how's it done what's the cost ( estimated) ? Also I heard you guys talking about other engine mods about mufflers and spark arresters ? What's that all about ? I have a Makita 9010 is this prime for modding ? Thanks Ian

 

Ian if the saw is out of warranty then you can take the muffler off and on the inlet of the muffler there is the baffle with 20+ holes take a 6mm hiss drill bit and drill out as many holes as you can reach which will be approx 8-10 re fit and richen the L jet to compensate for the mods done :thumbup:

[case mx270]

Cheers Andrew

[spudulike]

Not that I know much about the subject you may like to richen the "H" screw a little as I have known saws to be running a little lean on the high screw and once muffler modded - bang, one expensive repair:thumbdown:

 

You can either use a tach to ensure the saw is running at 500-1000rpm under max revs or do it by ear and testing the colour of the plug, it should look the same colour as a relatively strong coffee, if it looks a bit "Latte" then richen it further. When you rev the saw flat out, it should have a little bit of reverberation or "four stroking" in its note!

 

The L screw may need a tweak but will not damage the engine. Signs it will need doing are a slight bogging just after idle (early to mid revs) when the throttle is snapped open or thrown I to a cut when not being up to speed.