GPR exhaust for the Tenere
 

Hi !

First of all thanks for good reading and information in this site.

Just got myself a 09 Black Tenere with Yamaha sidecases and handguards with under 3000 km on the display.

I have ridden alot of adventure bikes so far :KTM 950,Varadero,BMW 1200 Adv,Africa Twin,Transalp,BMW 800 GS

I sold my last bike and bought the Tenere to have a inexpensive bike. Better then "no bike"..

After a few weeks the bike suprise me with stability and good road behavior. Same fun as the more expensive and powerful bikes.

Anyway, my question. I am looking for a aftermarked pipes. For look and maybe save some kilos.

After mailing with "GPR exhaust systems" they have provided me with following information their Aluminium system:

- weight aprox 2,5 kilo
- repack every 5000 KM aprox
- no need for remap/power commander.
- comes with on-road "muffler" (removable)
- price aprox 400 pund delivered to door ex VAT (non Eu country)
-minimal change in gassoline usage

Anyone with experience on this exhaust system ? good/bad ? I would love to save some kilos and get a little more "ralley" look.

any chance that only changing the exhaust system will give me a little more power in the bottom (2500-3500 RPm) ?

They do look good, but why repack them every 5000kms, that is no good.

The most gain we see from exhaust systems is around 2 to 2.5 HP, you get this gain from mid to top end 3500 up wards. If you want better pull from the very bottom end fit a 14T front sprocket, or a 46/47 rear sprocket if you still run on the highway at times.

repack every 5k !!! so that's about every....... 2/3 month :p

what's the associated cost ? can it be done by the owner ?

That suprised me as well. Don't know if it is needed under "normal circumstances" Maybe for 5k hard offroad driving only ? I have sent a question to the supplier about that.

As far as I know repacking is simple and gives back the "optimal" resistance in the exhaust witch is was ment for.

Thanks for the tip. Does that mean that it's possible to loose some power in the low RPM's when going from stock to 3.party exhaust systems ?

Most of the time I am on "B-roads" 75-90 km/h. That means 2900-4000 RPM in fifth gear.

I am looking for a little more power when driving by cars, accelerating etc. maybe Powercommander and DNA is the only solution ?

Regarding the "repack" of exhast. Some producers give information about repacking, some does not. Is this due to different "build" or is it simply the fact that some producers don't see this as good advertisment.

As far as I know original exhaust don't need re-packing.

That's pretty much the same type of roads I ride, and to be honest for less than �400 you can get a Powercommander V and a DNA filter for the bike, this gives you the power you want to pass cars. I have the same requirements as you.

You can get the PowerCommander through Simon (on here) for a very good price already setup with a map for the DNA filter. I takes about an hour of so to fit to the bike (depending on your own skill) but the effects are very noticable.

As Kev says, a 14t front sprocket (�13 from www.wemoto.com) will give you some more bottom end, I'll let you know how this works with the PC-V after I've had a chance to fit it! I am anticipating another quatum leap in power delivery as it's already much more responsive with the PC & DNA

All absorption silencers will need repacking at various stages to maintain their efficiency. 5000 miles doesn't seem a lot to me.
2.5kg for a twin silencer system is impressive, especially including the link pipe...given that the LV system weighs close to 9kg and is also ally.
My single titanium race silencer weighs in at 1.4kg, so I'd check that they aren't just weighing a single silencer.

Not the only solution but the best gain for your money, bike just wants to rev now, see the other threads on this with dyno graphs etc.

2.5kg must be for one silencer

that 5000km approx, (3000 miles). I do that in less than 3 month.

I've honestly never "repacked" a silencer so i do not exactly know what it does involve (opening the can, removing the stuff, stuffing back stuff (glass wool thingy ?), closing the can)

I do not think it is very complicated/long, after all I can replace clutch plates, change chain and sprockets and other stuff... but it's just the hassle. But hey, maybe it's just a simple thing in comparison of the weight gain/increased throttle response/nicer sound ?

Ditto. It's simply a case of drilling the old rivets out, removing the core and old packing, wrapping new packing around the core, and re-rivetting. You can buy the packing from most good bike shops, especially ones which cater to the off road crowd.