SOHC.co.uk Forums > CB350/400

Marving 4 into 1

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Dan:
Hi,
I was asked by another member if I would put some info on here about the exhaust on my bike, so here goes...

It's a Marving 4 into 1 race system bought from Wemoto.com about 18 months ago for £260.
Although its described as a race system it is not overly loud and has gone through 2 MOTs with no problems. It has a deep tone to it and only really turns up the volume when you open the throttle wide. Around town it isn't antisocial.

The system comes in one piece. You need to use your own exhaust clamps and collets and you have to fit the baffle in the silencer. The baffle and the cover for the end of the silencer are held in place by Allen bolts (supplied).

The system allows access to the oil filter and the downpipes follow a "standard" layout rather than the original systems swooping lines.

I haven't had the pleasure of riding a standard bike to compare with as mine came with a rotten hacksawed Marshall exhaust and I carried out a couple of mods on the carbs when rebuilding the bike.
Jets are one size larger, and needles raised one notch. The bike pulls well through the rev range with no flat spots. Occasionally as the throttle is cracked open there is a wooly feeling to the response but with a more positive wider opening this doesn't happen. I think this is more an issue with my carbs rather than anything to do with the exhaust.

After 18 months of mainly fair weather riding but a couple of times in the wet the chrome is unmarked. The only part of the exhaust that lets it down is the collecter where the down pipes join the silencer link pipe. For whatever reason this is not chromed but is hand painted with what looks like aluminium paint. Other welds at the end of the silencer are chromed and show no signs of corrosion.

Hope this is of use to anyone considering buying a Marving pipe. I've no regrets.

Dan

UK Pete:
What a great write up,  sounds quite good for a reasonabloe price
pete

tom400f:
Dan that's great - thanks for taking the trouble and really nice pictures. I think your carb mods are exactly the ones I did on my original 400F when I fitted that quirky Yoshimura pipe someone else on here has.

Also can't see much/any bluing of the downpipes ?

Cheers again
Tom

Dan:
Tom
I did give it a quick polish with Solvol before taking the pics. The only discolouration you get is on the bend at the top of the down pipes, as you might expect.
Dan

Bodd:
I was looking at getting one of those but after seeing your write up I'm not sure, the collector box does indeed let it down and the muffler isn't as upswept as I want. I contacted Wemoto who confirmed it was not road legal in the UK which I was prepared to chance but they also said the photo on their site is an "example" photo and the system may vary slightly. Thanks for the write up it helped loads.

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