John Dreuning Sidecar and Yamaha GTS1000 site

"John's GTS 1000 part 7"
Exhaust system modifications

To John's GTS part 1: Overview
part 2: Frame and hub steering
part 3: Fueltank modification
part 4: Electrical
part 6: Givi Monorack
part 7: Exhaust system modification

On the pictures you see an extension pipe at the original exhaust silencer. It was mounted to reduce the amount of exhaust gas that was sucked in the sidecar under circum weather and speed conditions.
The original silencer was getting a crack just before the mountig point. I've put special exhaust kit in the crack and put a thin stainless steel tie around the silencer to delay the time of falling of the bike.
Most parts of the original GTS exhaustsystem are stainless steel. However some parts are made from normal carbon steel. On those parts the corrosion problems will occure, esspecially when you ride in all kind of weathers. The carbon steel points are:
The measurementpoints bolts in the downpipes;
The short pipes in the front of the catalyserpart, where the downpipes go in;
The mountingpoints of the catalyser unit;
And some innerparts of the silencer.
The original Yamaha system is very expensive, quit heavy and will give the same corrosion problems in a few years.

Thanks to the GTS list, I decided to buy a whole new exhaust system from the UK compagny Renegade. They made a system for me just like I asked for. It was a bit different then their normal "standard" Renegade GTS system. The silencer is about 15 cm longer then normal to keep the gasses out of the sidecar. New exhuast chamber clamps were made for connecting the downpipes to the engine outlets. The originals were very corroded. These new aluminium clamps are not removeable from the downpipes, so you've to order them at the same time you are ordering the downpipes. The rest of the system is stainless steel.
Unfortunally the shiny stainless parts don't stay that shiny but coulored a kind of yellow after some time. There was a problem with the Lambda sensor that was switched place from the right side to the left side of the bike. This problem is only sidecar related, the mountingpoints of the centerstand is usally one of the places to connect the sidecar to the bike. Because of that there was not enough space for the sensor. A helpfull Honda Pan European did a great welding job for me and switched the Lambda sensor back to the right side and in such a position that everything fits. Thanks again Rob!
Renegade did warn me about the possibility that I might have some problems tot fit the system on a sidecar outfit. They would like me to come over to the UK for a tailormade sollution. But that did not fitted in mine timeschedule that time. So I don't blame Renegade just myself.

The catalist is not used in this full Renagade system. So the exhaust gasses will flow more easily without the restriction of the cat and also because the pipes are made with a diameter as big as possible.
There is almost no space between the two inner downpipes and the lower crankcase. But maybe the rewelding of the lambda fittings did resulted a bit reforming of the 4 in 1collector part. I guess that is also the reason of leaking some gasses between the downpipes and the collector. I have to find some very good gasketkit to close the leaks, a brand that will survive more than 3 weeks on the exhaust.
Well, I'm happy with the Renegade system and I like the dark roaring sound when the bike revs up to 4000 rpm or more.

To John's GTS part 1: Overview
part 2: Frame and hub steering
part 3: Fueltank modification
part 4: Electrical
part 6: Givi Monorack
part 7: Exhaust system modification
Back home

	On the pictures you see an extension pipe at the original exhaust silencer. It was mounted to reduce the amount of exhaust gas that was sucked in the sidecar under circum weather and speed conditions. The original silencer was getting a crack just before the mountig point. I've put special exhaust kit in the crack and put a thin stainless steel tie around the silencer to delay the time of falling of the bike. Most parts of the original GTS exhaustsystem are stainless steel. However some parts are made from normal carbon steel. On those parts the corrosion problems will occure, esspecially when you ride in all kind of weathers. The carbon steel points are: The measurementpoints bolts in the downpipes; The short pipes in the front of the catalyserpart, where the downpipes go in; The mountingpoints of the catalyser unit; And some innerparts of the silencer. The original Yamaha system is very expensive, quit heavy and will give the same corrosion problems in a few years.
	Thanks to the GTS list, I decided to buy a whole new exhaust system from the UK compagny Renegade. They made a system for me just like I asked for. It was a bit different then their normal "standard" Renegade GTS system. The silencer is about 15 cm longer then normal to keep the gasses out of the sidecar. New exhuast chamber clamps were made for connecting the downpipes to the engine outlets. The originals were very corroded. These new aluminium clamps are not removeable from the downpipes, so you've to order them at the same time you are ordering the downpipes. The rest of the system is stainless steel. Unfortunally the shiny stainless parts don't stay that shiny but coulored a kind of yellow after some time. There was a problem with the Lambda sensor that was switched place from the right side to the left side of the bike. This problem is only sidecar related, the mountingpoints of the centerstand is usally one of the places to connect the sidecar to the bike. Because of that there was not enough space for the sensor. A helpfull Honda Pan European did a great welding job for me and switched the Lambda sensor back to the right side and in such a position that everything fits. Thanks again Rob! Renegade did warn me about the possibility that I might have some problems tot fit the system on a sidecar outfit. They would like me to come over to the UK for a tailormade sollution. But that did not fitted in mine timeschedule that time. So I don't blame Renegade just myself.
	The catalist is not used in this full Renagade system. So the exhaust gasses will flow more easily without the restriction of the cat and also because the pipes are made with a diameter as big as possible. There is almost no space between the two inner downpipes and the lower crankcase. But maybe the rewelding of the lambda fittings did resulted a bit reforming of the 4 in 1collector part. I guess that is also the reason of leaking some gasses between the downpipes and the collector. I have to find some very good gasketkit to close the leaks, a brand that will survive more than 3 weeks on the exhaust. Well, I'm happy with the Renegade system and I like the dark roaring sound when the bike revs up to 4000 rpm or more.

"John's GTS 1000 part 7" Exhaust system modifications

"John's GTS 1000 part 7"
Exhaust system modifications