XJ650 Marving Exhaust

I have a 1980 XJ650 4K0 (UK) bike and I'm looking to replace the complete exhaust system.

One option is a Marving RACING system from Wemoto here in the UK, https://www.wemoto.com/bikes/yamaha...e/marving_racing_4_1_complete_system_-_chrome

Has anyone got one fitted to their bike or had any experience of Marving exhaust systems, if so, would you recommend I purchase one.

I've asked Wemoto to contact Marving on my behalf with the following questions but thought I'd ask here too.

1) Are the original cylinder head flange/retaining rings used to secure the header pipes to the cylinder head.
2) Is there access to the oil filter, sump drain plug & middle gear drain plug without removing the system.
3) Does the exhaust system come with a suitable bump stop for the centre stand.
4) Is the exhaust sound/noise acceptable.
5) Are any carburation modifications likely to be required.
6) Is the collector box flat (4 inline) rather than 2 on top of 2 which will reduce ground clearance.

Any feedback would be most welcome, pictures even better, thanks.

 

Found this photo, looks interesting.

 

You could try http://predatormotorsport.co.uk/ they had one for the 900f and may have one for your machine.

Also https://yambits.co.uk/

 

Thanks for your reply.

The Predator system is £485, plus the silencer looks a bit naff.



Yambits dont' do exhaust systems.

 

Ok I have a Motad one.

 

Unfortunately, Motad are no longer in business, I had one of their (2-1) systems on a Honda 400 Dream.

OSpipes, http://www.osmc.co.uk/ is another option. They will manufacture some s/s headers & a collector box to fit some Moto Guzzi V7 silencers I've been using with the original 40 year old collector box. The original header pipes were replaced with OEM in 1990, therefore, they are 30 years old.

OSpipes are in Stafford, some 3 hours away, plus I'd have to transport the bike to them, leave it a week or so, then pick it up & part with around £500.

 

Yes I was lucky to find one on E Bay. One of the guys on here had a nice system made for his bike the company is NRP Exhausts tel 01623 411191 located at Unit 1, Brailwood Close, Bilsthorpe, NG22 8UG, don't know if that is any closer to you.

 

I have not fitted a Marving system, but they are highly recommended by those who have.

 

Yes, NRP are closer, only 2 hours away.

Kev Pickering Performance Exhausts is on the doorstep but he's not the easiest guy to make contact with.

All feedback is welcome, would like to make a decision sooner rather than later.

Thought of a couple of more questions.

7) Does the chrome finish discolour easily (blue/brown)
8) Are the header pipes welded to the collector box, hence the system is in two parts.

 

Both Kev Pickering & Marving (Wemoto) have responded.

Will see what KP comes up with and take it from there. He's local and retaining a 4-2 system would be my preferred option.

 

I think the header pipes would need to be like the Yamaha originals double skinned against discolouration. The original yamaha had the collector box seperate from the headers. I had a Laser Jama four into two and the headers and balance pipe were one unit where the balance pipe was under the engine which was there to help with cylinder scavenging ie purging the remains of the exhaust gasses out of one cylinder by using vaccum from another cylinder. Let us know how you get on with getting a new system.

 

I agree with you about the Yamaha header pipes being double skinned. Cosmetically, they are certainly the easiest to maintain & retain their shiny chrome appearance with minimal effort. My other bike is a BMW R1200RT, have experienced both stainless steel & chromed mild steel headers. Yes, s/s does discolour but can be buffed up again without damage. Chrome is difficult to maintain, on the RT, I can remove the blue/brown colour with solvol autosol. The discolouration comes back almost immediately, it's hard work but the chrome doesn't look damaged.

A system made by KP would be from s/s, I'll just have to accept it will need some maintenance to maintain its' appearance. The bike is tidy but no where near concours condition. It's more about practicality than appearance. I may go for two 2-1 systems, one for each side and retain the two Moto Guzzi V7 silencers. Yes, I'll not have the 4-2 collector box but it'll make fitting & removing in the future a lot easier. Hopefully, it won't impact too much on the performance of the engine which has now done 52,000 miles so it's getting on a bit.

It's likely to be a least 2 weeks before KP can come and have a look at the bike & exhaust system.

 

1981, new in the days before colour.


1990 renovated, new OEM header pipes, original collector box sides re-chromed, possibly new OEM silencers too.


Most recent with Moto Guzzi V7 silencers fitted to OEM header pipes (30 years old) & collector box (40 years old).

 

Looks super I like the Guzzi silencers.

 

The Guzzi silencers can be obtained from Gutsibits in the UK for very a reasonable cost.

 

Thanks I will check them out.

 

Gutsubits, https://www.gutsibits.co.uk/pr/TheS...ll+Twins+2004-+Nevad&Cat=EXG&CatName=Exhausts

 

This was the bike fitted with Jama universal silencers. They were too long and flared out, had a make-up piece between the collector box & silencer.

 

Smashing bike you have well looked after. As l stated l had Jamas until a careless car driver destroyed them at a roundabout.

 

Been looking at this Marving 4-2 collector box as an alternative. It appears to be designed to work with the OE Yamaha headers and silencers. I've asked Wemoto to confirm this with Marving.

Meanwhile, has anyone fitted one of these collector boxes to their bike. The four inlets have an ID of 28mm and the two outlets an OD of 38mm. I'd have to get KP (exhaust man) to cut the OE headers and weld on a small length of 28mm OD tube to each to fit the collector box. The Moto Guzzi silencers have an ID of 38mm (inc. gasket) which should work with the Marving outlets.

Would it be an issue if the collector box isn't supported/bolted to the underneath of the engine as per the OE system. Thinking of the weight on the cylinder head stud mounts. Could possibly manufacture something to support if necessary.

Any comments would be much appreciated, thank you.

 

Found a local bike shop who managed to repair the one damaged OE header pipe by welding on a small length of 28mm tube. The broken bit of tube was removed from within the OE 4-2 collector box all for the sum of £40.

The system has been re-fitted to the bike, namely, 30 year old OE headers, 40 year old OE 4-2 collector box & 3 year old Moto Guzzi silencers. New copper cylinder head seals plus one header to collector box seal, all good without any leaks.

I'm rather pleased with the outcome, I really did want to retain the OE 4-2 system if at all possible.

 

Hello David regarding the Guzzi silencers do they fit the standard collector ok with Yamaha seals , did you have to make up brackets

to attach to footrest brackets

Thanks

Chips. ( Steve)

 

The Guzzi silencers came with seals at 38mm ID, which fitted onto the OEM 4-2 collector box. I think to OD of the Yamaha seals is fractionally greater but may still work with the Guzzi silencers.

The Guzzi brackets worked ok. I removed the rear footrests and used an 8mm dia. bolt in a 10mm dia. hole to give a bit of clearance. They are tight under the footrest plate.

On the LHS, a spacer was used to push the silencer in a little towards the wheel to clear the centre stand. A rubber bump stop was fitted to the centre stand too.

 

https://www.gutsibits.co.uk/pr/TheS...ll+Twins+2004-+Nevad&Cat=EXG&CatName=Exhausts

 

Hello David

Thank you that exactly the information i required

all the best

Chips (steve)

ygloDavid, post: 654965, member: 22271"]

The Guzzi silencers came with seals at 38mm ID, which fitted onto the OEM 4-2 collector box. I think to OD of the Yamaha seals is fractionally greater but may still work with the Guzzi silencers.

The Guzzi brackets worked ok. I removed the rear footrests and used an 8mm dia. bolt in a 10mm dia. hole to give a bit of clearance. They are tight under the footrest plate.

On the LHS, a spacer was used to push the silencer in a little towards the wheel to clear the centre stand. A rubber bump stop was fitted to the centre stand too.[/QUOTE]