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A few more It's been a few years, but as I recall the port durations without the base gasket are exhaust 158 deg duration, transfer 118 deg duration and intake 156 deg duration.

I should have known with this group lack of pictures equals last of interest. I recently moved and my compression tester and porting tools are MIA :( I think they might be buried behind Christmas ornaments under the stair well, but I'm not tackling that for another week. I only ran a couple...

Bump, I'll pay shipping, $400 to your door.

As much as it pains me to sell this saw, I haven't run it in a couple of years and don't see myself using it in the near future. It's a 181 with full wrap handle and 20" and 30" bars. I've had the saw for almost 20 years and gave it an overhaul to replace the crank seals, vibration mounts...

Thanks Mark!

The cylinder looked fine when I took it apart, no I didn't hone it. I think the compression is low based on how it turns over compared to my 181.

I don't have a compression testor. I've barely run it since replacing the ring, I think a noodled a couple of logs and that was it, not even a 1/2 a tank of fuels been run through it.

I bought this saw as a spare to my 181 and with thoughts of powering an Alaskan lumber mill. When I got the saw it was rough, I replaced the a/v mounts that were torn and missing, rebuilt the carb, put in a new ring, did a muff mod, new drive sprocket and replaced other missing odds and ends...

Just remember with flea bay that when you factor in their cut (on sale price and shipping) and paypal your loosing ~15% of the higher sales price. Not to mention the value of your time to pack the saw and ship it. So if you can get an extra $100 on flea bay, it would be worth it, if you only...

If the majority of the heat came from friction than running the saw wot at no load which is it's highest rpm would create the highest heat, and loading up the saw in a cut and dropping the rpm would cause the saw to run cooler. But, the exact opposite occurs. The saw run's it's hottest when at...

If you see any exposed wire then likely the ignition is being shorted out. I had an issue with my 181 where the wire to the kill switch was being pinched by the starter housing and it was enough to kill the ignition even though I didn't see any exposed wire. Be careful how you route the two...

The hottest thing in an engine are the exhaust gasses that are at about 1200 deg F. If instead of completely purging them from the cylinder with a fresh charge of air and fuel part of them linger in the cylinder due to muffler back pressure then the engine will most definitely run hotter. So a...

Fundamentally an engine is an air pump and your power is limited by how much air you can pump through it. An overly restrictive muffler has essentially the same affect as a too small carburetor, it restricts the amount of air that the engine can pump and hence it's power. It also has the...

Fundamentally an engine is an air pump and your power is limited by how much air you can pump through it. An overly restrictive muffler has essentially the same affect as a too small carburetor, it restricts the amount of air that the engine can pump and hence it's power. It also has the...

Either move the magnets in the flywheel relative to the pickup ie filing the key, or move the pockup relative to the flywheel by slotting the holes

Hey, you're right! I should have drawn a picture the first time to get it clear in my head. I've had too little sleep and too much coffee, the old grey cells are barely firing.

Could be the tank vent is clogged. I had a hole bunch of grief with my clogged vent once. Figured it had to be the carb so tore it apart several times to figure out why the engine would pop on choke, run for a few seconds than die.

I know I'm not the only one to have ported a 181 :msp_w00t:

Test Seeing if posting again will bring this thread back up.