Ozrider (Les) Big Bore exhuast, 1st in world!

[Claviger]

If cruising at 3500 or so and opening throttle fast the bike just goooooos. If opening fast at 4000-4500 or anywhere above it’s just plain rowdy and violent.

It’s not all the pipe, but some of it is.

The other items adding to the lower RPM torque are the 3D printed bellmouths, bored throttle bodies, and the decked head (compression).

The bored throttle bodies moved the torque peak(s), down about 500 RPM from where they were from back in March when I baselines my bike with this exhaust.

I put in my order for some new printed bell mouths last night and I took delivery of three stock intake rubbers.

Next trip to Nels is back to back comparison of the two options, we ran out of time this trip.

The lowered torque peak rpm by the throttle bodies means I can now run shorter bellmouths to spread the torque even wider and hopefully make a little more above 6500.

 

[Steel]

I'm sure glad I have a backup bike to ride, because I may be copying your mods to get better power too. The way it widened the torque curve is impressive. The way it hits at 4500 instead of 5500 would make rolling on at highway speeds more insane than it already is. Those poor kids on their liter bikes will drown from all of the tears in their helmets.

 

[Claviger]

The biggest change came with the Throttle Bodies.

It's not a totally straight forward modification though.

There's some fiddling required with the linkage assembly, a couple of vacuum ports behind the primary throttle blades that are sealed with the stock bore will be cut open and need to be filled with epoxy, and of course, a re-tune is required.

Then there's the matter of blending the rubber joiner between the TB and the head, nothing a few minutes with a dremel cant fix, but its a circle to oval transition, so you need to be careful when doing it to preserve smooth transition.

I do think its worth the effort though for the highly built naturally aspirated bikes, and I wish I'd done it sooner.

Ill update the TB boring thread with more pics.

EDIT: Added pics to the TB thread to show what I mean:
Throttlebody Mods and Tune

 

[Claviger]

A small but useful modification has been completed and they've been done a different (better?) color. Go back on tomorrow.

 

[barbagris]

Ah yes - pressurising the sump to force the oil into joints.

 

[geno]

The exhaust is now here. Test fit and test started today for a sense of sound.. more to follow on that. First lets look at some new exhaust ****!

Amazing you can fit an R3 exhaust in such a small box!!

Got clearance? The answer is YES. More than CES, hell, I think it's actually more than stock. Forward controls will result in a scorched leg....

Now for the good stuff, Les showing off his chops as a full out master in design, I'm in complete awe at how accurate this is. Fitting it took me literally about 3 minutes, including looking for tools, taking off the rear passenger peg mount, and about 2 minutes to replace and tighten everything. Even the most tricky bolt isn't bad.:

God this shot is horrid.. garbage camera strikes again. Notice the invisible O2 sensor that is fitted in this shot.

Weights will follow coating to make it fair, but I can say this:

Les exhaust seems lighter than my CES can alone, my CES exhaust seems lighter than a single R3 stock can alone, expect a very low number.

And the moment you've been waiting for... what does it sound like:

The video doesn't convey the volume, but it does convey the tonality and pitch. It sounds err AGGRESSIVE, barky, bassy, raw, angry, pissed, like a 2.3 liter about to stomp your face in.

Also: It is fing LOUD.

I realize being in the garage makes it echo and seem louder, but there is no doubt, it is a loud setup. Ya'll are going to want me either in back or WAY out front on RAA West

Going in for coating tomorrow, dyno numbers on 30 March

Here's what the bike did, on 92, with air filter in place:

Sounds really sweet bro; Enjoy and "Be Safe!

 

[Kevin frazier]

I’ll leave this here for you to mull over:

Bigger is better hehe heard that my whole life

 

[Kevin frazier]

I hope it woks well. At least we know @Claviger will give us some honest numbers whether good or bad. Over the years in different forums I've seen people claim crazy numbers, but never seem to want to post a dyno sheet.

BTW, I like my springs

Don’t tell sonny

 

[Kevin frazier]

The exhaust is now here. Test fit and test started today for a sense of sound.. more to follow on that. First lets look at some new exhaust ****!

Amazing you can fit an R3 exhaust in such a small box!!

Got clearance? The answer is YES. More than CES, hell, I think it's actually more than stock. Forward controls will result in a scorched leg....

Now for the good stuff, Les showing off his chops as a full out master in design, I'm in complete awe at how accurate this is. Fitting it took me literally about 3 minutes, including looking for tools, taking off the rear passenger peg mount, and about 2 minutes to replace and tighten everything. Even the most tricky bolt isn't bad.:

God this shot is horrid.. garbage camera strikes again. Notice the invisible O2 sensor that is fitted in this shot.

Weights will follow coating to make it fair, but I can say this:

Les exhaust seems lighter than my CES can alone, my CES exhaust seems lighter than a single R3 stock can alone, expect a very low number.

And the moment you've been waiting for... what does it sound like:

The video doesn't convey the volume, but it does convey the tonality and pitch. It sounds err AGGRESSIVE, barky, bassy, raw, angry, pissed, like a 2.3 liter about to stomp your face in.

Also: It is fing LOUD.

I realize being in the garage makes it echo and seem louder, but there is no doubt, it is a loud setup. Ya'll are going to want me either in back or WAY out front on RAA West

Going in for coating tomorrow, dyno numbers on 30 March

Here's what the bike did, on 92, with air filter in place:

Hey Rob quick question for ya, when you installed your headers did you install a new set of gaskets or does it need 2 sets, they’re calling for 6? Thanks

 

[Claviger]

I use 1 per cylinder as intended. I do use a little copper rtv around the outer edge before clamping it all down. Just a precaution.

Let's pipes haven't leaked at the head at all, on and off 3 or 4 times with the same gaskets now.