Exhaust pipe length in peashooter

Hobot · Apr 14, 2011

Diablouph. I do get carries away with drilling, telling the gals I be careful to only get em a little bit pregnant : ) [If they don't believe me, then they are smart enough not to date me, ugh.]

Eight extra inches is fine for dates but not so good inside mufflers. Just position things as best you can within the small range allowed and trim pipes to fit inside with reasonable excess to keep inside and nipped up by wimpy griping clamps. Seems like last time I measured on a few sets of pipes they tended to be 32" long.

Mostly they must hook up so not binding much to fracture at front bend too soon and clear swingarm and kicker lever. Common practice I and others resort to is kicking and bashing and levering the RH header/muffler while mounted till it conforms to our practical desires and ascetics. About no two sets of headers are the same bend or fit so luck of the draw what is required to alerter them or flat reject, ugh.

Diablouph · Apr 14, 2011

As often as not, it's because the Peashooter is is mispositioned.

I have the peashooters right at the rear of the back tire rim. Seems thats where most of the "stock" bike have them.

bpatton · Apr 14, 2011

My question from Monday still stands. How far from the bend is the muffler? Maybe you could post a picture?

kettle738 · Apr 6, 2013

Picking up on this old thread, I want to fit a set of peashooters to my Mk3 using standard downpipes with no balancer.

Having loosely offered them up I have exactly the same issue as one of the posters here in that my new downpipes are way too long for the peashooter silencer and would need to be pushed in by about six inches, maybe more. (they wont go in that far anyway as they hit the internal flutes)

I have no idea who manufactured the exhaust system I have, it has seamless silencers and it's a big bore system, the quality looks excellent.....I didn't want a big bore system but as I have it and it's brand new I dont want to fork out for another exhaust, so I'm pretty much committed to using it.

I am slightly mystified though as to why these downpipes should be so long....I have RGM stainless peashooter mounting plates and the angle looks close enough for me to believe the exhaust will fit with a bit of fettling, but I'm reluctant to start chopping lumps off the downpipes without first checking that I'm doing the right thing.

Does anyone have a photo of a Mk3 please with peashooters showing the area around the downpipe to silencer join as that would certainly help.

Mick.

L.A.B. · Apr 6, 2013

kettle738 said:
I have no idea who manufactured the exhaust system I have, it has seamless silencers and it's a big bore system, the quality looks excellent.....I didn't want a big bore system but as I have it and it's brand new I dont want to fork out for another exhaust, so I'm pretty much committed to using it.

I am slightly mystified though as to why these downpipes should be so long....I have RGM stainless peashooter mounting plates and the angle looks close enough for me to believe the exhaust will fit with a bit of fettling, but I'm reluctant to start chopping lumps off the downpipes without first checking that I'm doing the right thing.

Perhaps it's the RGM big bore system? This has longer "tuned length" pipes and so requires a different pair of brackets to move the peashooters further back, otherwise the pipes must be shortened to fit with standard brackets.

http://rgmmotors.co.uk/main.htm

598 050302 PAIR OF STAINLESS STEEL BRACKETS TO MOVE SILENCERS BACK, USE WITH ITEM 599, OTHERWISE THE PIPES WILL NEED TO BE SHORTENED
C £ 13.90
599 050018 SPECIAL EXHAUST SYSTEM FOR COMMANDOS, WITH PR LARGE BORE (1 1/2") TUNED LENGTH, TUCKED IN, EXHAUST PIPES WITH MATCHING LARGE DIAMETER REVERSE CONES, UTILISES STD BRACKETS
C £ 210.00
558 061978BB BIG BORE (1 1/2") REVERSE CONE SILENCER
C £ 69.90

pete.v · Apr 6, 2013

kettle738 said:
Picking up on this old thread, I want to fit a set of peashooters to my Mk3 using standard downpipes with no balancer.

Having loosely offered them up I have exactly the same issue as one of the posters here in that my new downpipes are way too long for the peashooter silencer and would need to be pushed in by about six inches, maybe more. (they wont go in that far anyway as they hit the internal flutes)

I have no idea who manufactured the exhaust system I have, it has seamless silencers and it's a big bore system, the quality looks excellent.....I didn't want a big bore system but as I have it and it's brand new I dont want to fork out for another exhaust, so I'm pretty much committed to using it.

I am slightly mystified though as to why these downpipes should be so long....I have RGM stainless peashooter mounting plates and the angle looks close enough for me to believe the exhaust will fit with a bit of fettling, but I'm reluctant to start chopping lumps off the downpipes without first checking that I'm doing the right thing.

Does anyone have a photo of a Mk3 please with peashooters showing the area around the downpipe to silencer join as that would certainly help.

Mick.

Some Big bore system are long, (a tuned effect) and come with extended brackets that move the silencers back about 3". You can hack off 3" from the pipes and you should be good to go. Or you can give Commando specialties a call and get some of these extenders. It's nice to have choices. Granted, this is not a MK3 picture but in this case it should cross over.

Old Bloke · Apr 6, 2013

pvisseriii said:
kettle738 said:

Picking up on this old thread, I want to fit a set of peashooters to my Mk3 using standard downpipes with no balancer.

Having loosely offered them up I have exactly the same issue as one of the posters here in that my new downpipes are way too long for the peashooter silencer and would need to be pushed in by about six inches, maybe more. (they wont go in that far anyway as they hit the internal flutes)

I have no idea who manufactured the exhaust system I have, it has seamless silencers and it's a big bore system, the quality looks excellent.....I didn't want a big bore system but as I have it and it's brand new I dont want to fork out for another exhaust, so I'm pretty much committed to using it.

I am slightly mystified though as to why these downpipes should be so long....I have RGM stainless peashooter mounting plates and the angle looks close enough for me to believe the exhaust will fit with a bit of fettling, but I'm reluctant to start chopping lumps off the downpipes without first checking that I'm doing the right thing.

Does anyone have a photo of a Mk3 please with peashooters showing the area around the downpipe to silencer join as that would certainly help.

Mick.

Click to expand...

Some Big bore system are long, (a tuned effect) and come with extended brackets that move the silencers back about 3". You can hack off 3" from the pipes and you should be good to go. Or you can give Commando specialties a call and get some of these extenders. It's nice to have choices. Granted, this is not a MK3 picture but in this case it should cross over.

I have a full RGM supplied big bore system inc peashooters, and that bottom photo is what it looks like mounted.

kettle738 · Apr 7, 2013

Well, many thanks for that, this is what I love about this forum, I was scratching my head wondering why anyone would make downpipes too long, now it's mystery solved and an RGM exhaust is highly likely.

I guess there is an obvious question that follows, my Mk3 will be bog standard apart from the peashooter exhaust, black box air filter included.

Given that it is just going to get ordinary road use, I wont be flogging it too hard, is there any advantage to keeping the tuned length and perhaps more importantly any disadvantage to cutting them and using the standard fittings?

Mick.

Old Bloke · Apr 7, 2013

kettle738 said:
Given that it is just going to get ordinary road use, I wont be flogging it too hard, is there any advantage to keeping the tuned length and perhaps more importantly any disadvantage to cutting them and using the standard fittings?

Mick.

I've tried a few different systems over the years, a 2-1 system, set of SS pipes, set of SS pipes with VW Beetle tailpipes welded on :shock: , standard pipes, and the RGM big bore set, etc.
They all tend to make the power delivery feel different, sound different, and of course look different.

In my opinion, for road use, fit what you are happy with in terms of aesthetics, noise, and indeed cost, get you carburation set right, and you'll be a happy owner

kettle738 · Apr 7, 2013

Thanks, I've cut the pipe back by a few inches, fitted the right hand side and all appears ok.

I just hope they are not too noisy, but it's a done deal now.

Mick.

Old Bloke · Apr 7, 2013

kettle738 said:
Thanks, I've cut the pipe back by a few inches, fitted the right hand side and all appears ok.

I just hope they are not too noisy, but it's a done deal now.

Mick.

Use ear plugs, they'll sound just fine

Onder · Apr 7, 2013

But officer, they are absolutely genuine pipes as built. All bikes used to
sound like this....

Exhaust pipe length in peashooter

Hobot

Diablouph

bpatton

kettle738

L.A.B.

Moderator

pete.v

Old Bloke

kettle738

Old Bloke

kettle738

Old Bloke

Onder

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