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Post by eliminator on May 3, 2008 7:48:26 GMT
1998 Divvy. The exhaust system is original, the collector box has blown, this is on the crossover pipe at its rear end. Being a cheapskate I was going to try to bodge it with jubilee clips, some thin gauge steel & exhaust putty of some sort. Hole is on the top bit of this tube. If / When this doesn't work, any tips on how to get it off. Bolt heads are now an "interesting" ! shape. I'm more concerned about separating the collector box successfully from the down pipes & the silencers. I'd rather not buy downpipes, as the idea of trying to successfully remove the nuts from the cylinder head does not appeal  The silencers are in good nick, the downpipes cosmetically are a little bit rusty, seem OK. But once separated from the collector, are they prone to falling to bitswhere they fit inside this colector. Might it be the case that I buy the collector only to find that I'll need to buy the downpipes? M and P sell the Motad collector box @£137.48, or a Delkevic one for £99.00. Anyone care to comment on the quality and ease of fitting on either of these? |
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Post by tonytango on May 3, 2008 10:06:47 GMT
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Post by CD on May 7, 2008 16:38:13 GMT
If that's gone try Delkevic. I bought a collector, downpipes and gaskets from Sandy Bike Spares. Well made, easy to fit and good service from Sandy's. I also tried to repair my collector box it lasted at least... easily... days. Until I used it.  Total waste of time and repair stuff. The collector box mounting bolt will probably turn with a 6 point socket. At a guess 12mm or 14mm across flats. |
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Post by El Fuego on May 15, 2008 14:11:46 GMT
We fitted a new Motad collector to my D900 recently. Also had to get new tube pieces welded on to the silencers (where they mate with the collector) ... they fell apart when trying to remove them! (That's a key area to watch for ... the silencers are prone to rotting there).
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Post by CD on May 20, 2008 15:11:09 GMT
The pipes also crack where they are welded into the silencer can inlet cone. Best welded with gas or maybe TIG. With gas welding the welding stress is spread out over wider area than arc or MIG welding.
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Post by eliminator on Jun 8, 2008 10:24:24 GMT
Exhaust paste combined with a baked bean can, wired up with those special plier thingys that twist the wire seem to have cured it.
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Post by CD on Jun 10, 2008 21:47:07 GMT
Well done.  |
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Post by eliminator on Jul 5, 2008 21:20:21 GMT
Err, 10 miles of deserted Motorway at 120 to 130 blew the collector box in a different place! Bastid! Now spraying copious amounts of Plus Gas at the joints & bolts etc. Silencer clamps unbolted, but clamps fell apart.But the rust between the silencers & collector box seems rock solid! 2 bolt heads on the downpipes to collector box are no longer hexagonal due to rust I've decided the best  ploy is to remove the whole system. Managed 5 of the 8 downpipe clamps at the moment, don't want to push my luck by forcing them prematurely! The middle pipes are hard to access with my socket allen key, I'll have to cut an Allen key to suit. I.e. cut off the "L" bit so that I can drive it straight from a socket. Hoping to be able to drop the whole system off of the bike, but seems as if I will have to hacksaw through the collector box otherwise the whole lot won't clear the main stand. |
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Post by CD on Jul 6, 2008 12:16:53 GMT
THis is how I did it...
Take silencers off
Undo all of the downpipe clamps to the cyl head
Remove the bolt under the back of the collector
The whole lot will drop down and pull forwards away from the engine.
When fitting a new collector loosely connect up the down pipes to the collector being careful to not push the gaskets in too far. Then fit it to the bike and put in the collector's rear mounting bolt. The cylinder head clamps can then be tightened and then the downpipe to collector clamps. Finally tighten the collector mounting and fit the silencers.
I would say dont bother with the old gaskets in the cylinder head. Dig them out and fit new ones.
I have also tried some stainless dome nuts on the cylinder head studs. They seem to work well with lots of copper grease and they wont corrode or get clag up the threads like the original socket nuts
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Post by mickandrita on Jul 6, 2008 14:19:09 GMT
I bought a complete system from sandy bike spares but can not get it to fit correctly, number 1 and 4 down pipes seem to be too short and number 3 and 4 too long also the silencers should clamp on to the collector but the dia of the pipes are too big when you tighten the small bolts up as far as they will go the silencers are still loose on the collector the whole system is noisy as it blows from every joint, I am sick of taking it off and on and swapping the pipes around trying to get it to fit,I went back to sandy bike spares and they gave me a tube of exhaust paste and suggested I use an exhaust bandage on the silencer joints,I am taking it back tomorrow and trying against another one but if it is the same I will get a refund and will pay the extra £40 for a complete motad system from my local dealer or possibly try a Delkvic system as £389.99 is still a lot of money to have to then try to bodge it on to the bike, don't get me wrong the guy at sandy is a nice guy and is trying to be help but all the same you pay your money and take your choice,strangely enough though the silencers are stamped motad and came in a motad box so I can only assume that the down pipes or collector box which I think they may have fabricated for them do not match up with the rest of the system.It seems that other people on this site have bought systems from them and are happy with it so I am hoping they can replace it with one that fits together as I would like, I would be interested to hear any comments as all I want to do it fit and ride my bike!
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Post by CD on Jul 6, 2008 16:13:20 GMT
Mine is from Sandy Bikes and made by Delkevic it went on no problem. The header pipes are not all the same but the differences can be worked out from the variable lengths on the collector box inlets and the angles at the bottom ends. Also the original gaskets in the cylinder head exhaust ports are virtually invisible. They need to come out and brand new ones fitted. Who knows the ports might already have two gaskets in there. Dig away with a sharp screwdriver and you'll find them.
The only issue I had was pushing the tube gaskets into the collector box, but starting with them sticking slightly proud seemed to sort it out.
If the cans wont align properly, check the pillion footrest hanger brackets (on the frame) are not bent. My offside was so far out of line the pipe could never be lined up. Removing the alloy pillion footrest hanger for better access showed up the problem.
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Post by eliminator on Jul 6, 2008 16:20:06 GMT
6th downpipe nut has come off. just soaked the others yet again with Plus Gas.
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Post by mickandrita on Jul 6, 2008 18:05:42 GMT
I tried every combination with the front pipes and still the outside ones wont push far enough into the collector box which means when tightened up the gaps in the collector tubes don't cover the gasket on the pipe and so they blow and the two inner pipes push too far into the collector box so that the smaller diameter part of the down pipe plus gasket does not tighten up because the collector pipe is clamping on the larger part of the down pipe plus there is still the problem of the silencers having too large a diameter to clamp around the collector stubs when I try to wrap exhaust bandage round the stub of the collector box when I push the silencer on it pushes the bandage off and just mangles the bandage,I am hoping from what you say, the system I have may be incorrect,the down pipes by the way had stickers on that someone had numbered from 1 to 4 and I had fitted them according to the numbers it was only when I could not make them gas tight that I removed them and tried them in other combinations .As to the allen nuts that hold the front pipes to the head it took me 2 days to remove them by combination of heat, chisels, mole grips, drills, and finally hack saw before I got them all off they must be the worst idea I have ever seen in 30 years as a mechanic.
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Post by CD on Jul 6, 2008 18:43:41 GMT
It could be there are some gaskets rammed into the exhaust ports that are stopping the pipes fitting close enough to the engine. The gaskets are about 1/4" thick. I bodged mine out with a screwdriver and hammer. The Yamaha socket nuts are a gormless idea presumably because there is not much space around the frame tubes. But I've fitted 8mm thread (13mm across flats) dome nuts easily tightened with an ordinary 3/8" drive socket. No spanner clearance problems and no way for crud to get into the threads. Good quality easing oil shifted most of mine but I got two off by welding onto the outside of the nut. The heat expanded it and off it came. Total PIA though as had to disconnect electrics and protect the engine from welding sparks. |
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Post by mickandrita on Jul 6, 2008 19:45:27 GMT
I had removed the old gaskets and fitted new ones,I refitted them with some flanged nuts I had and as you say I had no problem tightening them with a socket and a spanner.I will take the system back to sandy and try the pipes against another set but it still doesnt solve the problem of the silencers being too big where they slide on to the collector box.
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Post by teejayexc on Jul 6, 2008 20:25:37 GMT
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Post by mickandrita on Jul 7, 2008 8:05:54 GMT
with the standard yamaha system the silencer tubes have a much larger diameter in order for them to fit with the gaskets but the motad silencers are meant to be a close push fit on to the collector stubs and then tightned by the pinch bolt but they are slightly too large to enable a gas tight fit but there is not enough clearance to fit any sort of gasket the system will fit on the bike ok but the problem is it cannot be made gas tight without resorting to bodging it on with exhaust paste and bandages which I think you will agree does not look very good and does not bode well for longevity as the system has a certain amount of flexing due to the rubber mountings to stop fatigue setting in because as you know there is a degree of vibration inherrant with the engine so while exhaust pastes etc may offer a tempory solution long term it is not the answer
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Post by eliminator on Jul 7, 2008 19:16:35 GMT
High temperature silicone sealant perhaps?
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Post by mickandrita on Jul 8, 2008 15:34:30 GMT
I returned the system yesterday to sandy bike spares fair play, instant refund no quibble.
Has anybody fitted a complete delkevic system to their 900 with the oval silencers ? I like the look of this system and it looks to be nicely made,any problems getting sliencers to clear the rear axle bolt on the diff unit ?,any info greatfully received all I want is bl**dy exhaust so I can ride it!!
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Post by mickandrita on Jul 11, 2008 10:57:05 GMT
Have bought and fitted a complete dekelvic system bought from Mad4Bikes.com it fitted perfect and sound great as it has more modern looking oval silencers with removable baffles,only problem was the supplied silencers straps need to be a b shaped strap so that the silencers clear the rear axle bolt but a quick call to dekelvic and they were posted out the same day free off charge,I must recomend Mike at Mad4Bikes for his excellent friendly service he even suggested that he had some silencers that were slight seconds at a big saving over regular ones all they needed was a quick buff with autosol to restore them to perfect all in all I am well pleased also thanks to everyone who gave their advice on this site,cheers.
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Post by eliminator on Jul 11, 2008 13:11:54 GMT
How much did this system cost then? Incl. all gaskets?
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Post by mickandrita on Jul 11, 2008 15:50:39 GMT
£389.99 including all the clamps,gaskets and link pipes etc,just make sure to specify the 'b' shape straps for the silencers,mike also does a good range of batteries,and no I don,t have any connection with Mad4Bikes but I do appreciate good old fashioned service.
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Post by eliminator on Jul 12, 2008 13:42:12 GMT
Got the last 2 nuts off after buying a blow torch & heating them up.
Whole system off of the bike, one silencer still stuck to the collector box. The other silencer has rotted away at the connection point.
Three of the downpipes are OK, apart from looking scabby, the fourth one is still stuck in the collector box, as its clamp's bolt is no longer hexagonal! But it seems to have some corossion where it fits the collector box, I.e. it has a split.
The way forward would seem to be to buy the whole replacement system. I assume that it has the bump stop arrangement for the main stand? Also that the oil drain bolt is still accessible?
The Dekelvic system looks better than the Motad system, So bafles are removeable, when removed is the sound nice and rumbly or offensive?
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Post by mickandrita on Jul 12, 2008 18:42:22 GMT
the new system sounds really nice low rumble and with the baffles removed sound just as good but slightly louder but certainly not offensive,if you are any near me in the bedford area you are welcome to come and have a look and listen to mine.
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Post by eliminator on Jul 12, 2008 19:11:55 GMT
Thanks for the info. Thanks for the offer of having a listen, but I am just outside of Southampton.
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Post by mickandrita on Jul 13, 2008 12:35:27 GMT
I'll give it a good rev up and you can listen out of the window !!
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Post by eliminator on Jul 13, 2008 17:46:30 GMT
Thought you said it wasn't offensive  ;D |
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Post by chunk166 on Jul 13, 2008 18:07:08 GMT
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Post by eliminator on Jul 14, 2008 10:54:45 GMT
Just ordered the complete system from Mad4bikes. Just need to wait for it to arrive and fit it. 1 rung my local bike shop who offered me a Motad system, which has chromed silencers, for £434, as I know them £400. It looks the same as the original, whereas the Delkevic will give the Divvy a more modern look. ;D All I need to do is lose weight grow hair to go the same way Mad4bikes price was £434, I said that a guy from here had bought it for £389, he said that it was the last of the ones that needed a bit of a polish, but he knocked off the postage. Better than a kick up the bum I suppose! |
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Post by eliminator on Jul 17, 2008 12:12:38 GMT
Hm, got the Delkevic system. I'm having problems The short pipes that connect from the collector box to the silencers are of (in my opinion) to much clearance on the collector box outlet. mickandrita what were yours like? I'm struggling to get the 'b' shaped clamps to go around the silencers in a manner that keeps them parallel to the swinging arm. mickandrita could you please post some pictures of your system for me? I'd like to see a shot from behind the bike & how far along the silencer the 'b' shaped clamps are fitted. Ta |
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Total waste of time and repair stuff.
ploy is to remove the whole system. Managed 5 of the 8 downpipe clamps at the moment, don't want to push my luck by forcing them prematurely! 
;D