I noticed Ryobi 31 exhaust port is kind of a long narrow slit and am thinking a little more area would be beneficial. I've removed the "post" and wided Homie 25 exhaust with pretty good results but did not change the height so as not to mess up timing. The Ryobi E port is plenty wide but very narrow. Has anybody tried enlarging this port[sm=what_smile.gif]

Some of the Ryobis come with very short exhaust timing and definitely respond to more. The only way to do it right is to get a degree wheel and check it out. Shoot for around 150 degrees. Go slow, and take off a little at a time and keep checking the timing until you get what you want. Then be sure to chamfer the port edge slightly so as not to damage the piston and/or ring.

AV8TOR

Some engines need that "post" for ring support. If edge of piston ring gets snagged on new port size...its by by ring! Capt,n[&o]

[8D]I oil um really good then spin with a drill before I put gas in um. Then break in slow and use the radio so's there's distance between me and it.[X(] The way I've heard it if the ring(s) are pinned you don't need the post cuz the ring end is what will most likely grab the port. But I tried intentionally positioning the gap at the exhaust port on one ( a 25 Homie sans post) a couple years ago and had no trouble and that block is still flying. That reminds me. I've gotta get the guy who has it to pull the muffler to see if the gap is still where I left it. Plus I have a box of spare 25cc blocks in case of worst. Now the 30's (old style at least) have pinned rings and guess what. No post. I think you're right tho-it's not good practice if you can't experiment. Speaking of 30cc homelite did you know Tower's charging $65 ship surcharge on the bigger arfs. They had a parts 120 GP Big Stik for $28 the other week but $65, plus the usuall 9.99 [sm=angry_smile.gif] to ship. Almost fell out of my chair. I e-mailed um that you can Greyhound something like that for about $25 but I don't think anybody was home.l