Recent content by Cerberus

OH Dyno Joe!! Thanks am glad to re-watch that one, LOVE his content, at any rate I thought that one was very interesting because if you look at the middle evaluation (4:45) you'll see that, of the 3 real 'short-pipe' mufflers, the 1 OEM box muff, and the megaphone, things were as-expected for...

Couple quick Q's: - Generally speaking, would it be preferable to have more total exits on a muffler (if the total exit area were a fixed-area?) - I'm VERY interested in the effects of volume of the muffler, for instance if your blowdown required 24.5deg for near-atmosphere in the cyilinder...

Thanks for the link Ketchup, am blown-away at how much great stuff I'm seeing here, I have to leave a couple replies for later to keep this from being too long but there's too much that's "almost on-point" here!! It actually is able to, it cannot help it, when the exhaust pressurizes the muff...

tl;dr-- I was rough, using my impact-gun to remove the lower, clutch-side retention bolt for my full-wrap handlebars...these bars have always exhibited strong outward pressure so the 2 retention screws on clutch-side are "under load" as you're installing/removing them.... They'd been installed...

tl;dr-- Seeking any&all data, insight, #'s, anecdotes, guesses & speculation(please be clear it is that, though!), on optimization of modding an OEM 660 muffler. I'm speaking of everything from exit hole placement to exit hole size to changes to the front-plate (or even its absence) hell even...

tl;dr -- Going-up to 8t sprockets worked, but I found the chain-tensioner's range was significantly limited when using my 25" Roll-o bar (but not so bad on the other unit w/ the 32" Oregon) so I'm kinda worried about getting the (9/10)tooth unit only to find it doesn't work/fit!! I should be...

I'm not looking but you'll have a lot better luck if you: - take a picture(s) of it; - tell which generation it is (presumably/hopefully a 3rd gen?); - come up with a firm price, and whether that includes shipment or not & whether there's anyone "as escrow" or what happens if problems (unless...

tl;dr -- @mdavlee is there anything you could share/add to this concept that wasn't already explained here? Looks like your~3/4" long Grunt Gasket is relatively straight-shot, am I seeing that accurate or is there some divergence in those walls of the Gasket? Thanks for any insight you can...

@Ketchup "The reason so many people have gutted the internals of saw mufflers and made a big hole is because it works. Subtle changes to the exhaust are relevant, but the big gain is in more flow volume." I've got a handful of other points I have to cover in another post but Re muffler exit, of...

Wow great posts and didn't realize there was an exhaust thread it's been the better part of a year since I read the series :P Will certainly be over there w/ appropriate topics :D Huskihl are you positive Re those "lipped exhaust ports"? That is amazing if so, I mean it's hard to imagine a...

To be crystal clear, you're saying if I simply order the gudgeon/wristpin bearing as well, then the 395 piston (and its included wristpin) will properly fit my 660 con.rod? Will be ordering asap, am so uncertain why this wouldn't already be "a norm", from the pics it seems that at-worst I'll...

Welcome!! I always start at 10-20thou and if being honest I've mixed-up which of my units has the 10, and the 20, thou keys (am like 99% sure the 20thou-removed key is in my "felling build" with the 56mm head, and the 10thou is in the 54mm bucking-build) Would be curious for elaboration on...

Just for updating, have seen results of: about 2HP for un-ported but modified units; nearly 2.5HP on a ported one (youtuber Dyno Joe shows the #'s on one he did, and as mentioned up-thread the curves HP & torque rise quite equally it's neat, was expecting to see way more HP than torque gain...

Thanks!!!

If you search for the Exhaust Port megathread, I'm actually breaching that topic right now. If you're only doing the exit on a 2511t muff just copy what Duke / pre-made ones are using (please resist the urge to drill-through the baffle-wall that is behind the exit hole, doing so short-circuits...