Compatibility of 312R exhaust to 750S? - MVAgusta.net
 
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post #1 of 10 (permalink) Old 06-04-2013, 06:08 PM Thread Starter
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Compatibility of 312R exhaust to 750S?

Hi all-

Does anyone know weather or not the 2007 Arrow 312R slip on exhaust portion would fit an early 750 F4 ? I've come across one for sale and I like the silver tips versus my black ones, plus being a 312 I figure there is a slight sound/performance increase.

Anyone know?
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post #2 of 10 (permalink) Old 06-04-2013, 06:28 PM
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Originally Posted by mjedm6 View Post
Hi all-

Does anyone know weather or not the 2007 Arrow 312R slip on exhaust portion would fit an early 750 F4 ? I've come across one for sale and I like the silver tips versus my black ones, plus being a 312 I figure there is a slight sound/performance increase.

Anyone know?
Yes they will fit for sure.
I don't think there will be any performance gain though, some 750's came out with RG3's which where actualy more performance orientated than the standard 312R pipes.

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post #3 of 10 (permalink) Old 06-04-2013, 09:57 PM
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Donsy, I got an older F4 750 header system from the states for my 09 1078, for $53, so that I could get rid of the cat converter. It fitted straight on and everything lined up perfectly. My standard 1078 mufflers fitted straight on too.

The reverse therefore will be true - old mufflers on to newer headers. Go ahead - no problem.

Now I need to get my mufflers sorted.

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post #4 of 10 (permalink) Old 06-05-2013, 12:12 AM
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My EV03 750 slip on exhaust was not compatable with my 312R slip on,
The Casoli slip-on shown here fitted no problem straight onto my EV03, this cannot be done with my 312R, I tried and found the difference.

will leave it for the big boys to work out why
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post #5 of 10 (permalink) Old 06-05-2013, 06:53 AM
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I fitted a second-hand pair of the later slash-cut slip ons to my F4S 750's headers without a problem.

Si
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post #6 of 10 (permalink) Old 06-05-2013, 10:53 AM
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Yeah, be carefull, sometimes these aftermarket headers come along and crap in the pond. I have installed SPR headers onto a 312rr's tail, close call on clearing the motor.
The first 750's (short motor) was a bit different, and then the 1078 got the higher head, things to keep in mind.

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post #7 of 10 (permalink) Old 06-05-2013, 06:21 PM
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Yeah, be carefull, sometimes these aftermarket headers come along and crap in the pond. I have installed SPR headers onto a 312rr's tail, close call on clearing the motor.
The first 750's (short motor) was a bit different, and then the 1078 got the higher head, things to keep in mind.
Did the 750's get a longer motor as they progressed to Evo3, or are you just saying 750's are a short motor compared to say the 1000S, Tambo, or 1000R ?
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post #8 of 10 (permalink) Old 06-05-2013, 06:27 PM
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I was a bit worried about the clearance with the 750 headers, given the 1078's taller cylinder block but there's heaps of clearance. Exhaust ports have the same spacing, the diameter of the downpipes is the same too, and the two mounting points are also the same.

I took a punt on whether they would clear the sump and bought them anyway because they were so cheap - they bolted straight on and the job was done in about half an hour.

The only issue I had was with the O2 sensor, which is not present in the earlier headers. Didn't need it anyway because I'm running an earlier ECU.

If you are just changing mufflers then they will fit straight on. I'd put money on it. Most of the open mufflers were slipons anyway, not full systems so they have to fit on to standard headers.

Donsy - you wouldn't have a spare 39 tooth rear sprocket kicking around would you?

Cheers, Rich.

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post #9 of 10 (permalink) Old 06-05-2013, 06:30 PM
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Quote:
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Did the 750's get a longer motor as they progressed to Evo3, or are you just saying 750's are a short motor compared to say the 1000S, Tambo, or 1000R ?
Enjoying IOMTT Donsy ? Go Cam in the Senior !

The 750's had a shorter cylinder block. The 1000's and 1078 had longer stroke and therefore taller cylinder block.

There are other subtle differences, like a teeny tiny starter motor on the 1000's and 1078, versus the truck like one on the 750, but everything else is essentially the same.

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post #10 of 10 (permalink) Old 06-05-2013, 07:36 PM
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Quote:
Originally Posted by SCRINCH3R View Post
Did the 750's get a longer motor as they progressed to Evo3, or are you just saying 750's are a short motor compared to say the 1000S, Tambo, or 1000R ?
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Originally Posted by Ducati888 View Post
The 750's had a shorter cylinder block. The 1000's and 1078 had longer stroke and therefore taller cylinder block.

There are other subtle differences, like a teeny tiny starter motor on the 1000's and 1078, versus the truck like one on the 750, but everything else is essentially the same.

I'm not sure if there was a change in the 750 motors height itself guys, but I'm pretty sure there was a difference between the 750 going to a 1000, and I know the head size is much different between the 1000 and the 1078, making cam cover removal a bit more tricky.

Stroke went from 43.8mm on the 750 to 55mm on the rest, on the 1078 they increased the bore from 76mm to 79mm, the stroke stayed the same.

There's quite a few variations on the exhaust headers and mid-pipe assemble Rich, I can think 5 different pipe layout's as we speak, and header sizes where different too, but they are the same size at the ports.
I've installed SPR headers and midpipe onto a 1078, they just clear the bottom of the motor, but the rest goes on easy. Now there's a set of pipes I would have liked.

I remember there was a difference in pipe dia going from mid pipe to tailpipes on some-one's bike, turned out it was an aftermarket set-up which had changed I think, or the 312R+ used a different flange set-up to others.
Maybe Carl can remember the thread, I know we where all taking pictures and measurements like crazy.

Here's a few.
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Last edited by Donsy; 06-05-2013 at 07:39 PM.
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