i have the road legal predator pipe on now the hole system and it sounds pretty good / quiet in town with a nice thump thump when its got a load on it
onlt thing i was a bit worried abot the the system didnt line up correctly with the mounting holes on the rear of the bike it had to be forced up a few inches

predatorexhaust
 

i just had exhaust fitted today at predator,ovel can,is the nuts,ask for mark done an excellent job,good price,say jim with the tt600

Predator system
 

Just fitted a full system (road legal) from Predator looks and sounds great had to use a lot of exhaust paste to seal the silencer section onto the downpipes to stop it blowing though. Looks and sounds a lot better than the Laser can I saw on an XT the other day.

My bro fitted a crd header last year along with a remus gp silencer,They are both very light and a beauty to look at.
The header is also a bit wider inside i think and the silencer wont wake up
the dead.At least the street legal version wont.
As for the main jets im really confused.Dont even know what to do with
my bike.
Theory wants increase in main jet number as airflow increases.
The XT however seems to dislike any change and last week i was told
that even the dynojet kit doesnt contain main jets,wich means it doesnt
need any change there unless heavily modified.

advice needed?
 

After fitting the predator system and pipercross filter my 2003 XT feels a bit under powered has anyone got any ideas? I was thinking of fitting a dynojet kit but I want to keep the bike a reliable as possible and keep engine mods to a minimum. I am certainly not a mechanic but any advice I can pass on to my local bike shop would be great.

Did you get the road legal predator or the window shaker ???

When you "open up" the breathing on a bike you often increase power higher up the rev range and sacrifice lower end grunt.

You may have made the mixture too lean which means carb adjustment will be necessary.

If your going to a garage, say that you want a gas analysis done on the exhaust. This will determine the correct air/fuel mixture. Its just a case of hanging a probe in the exhaust so dont get ripped off.

Predator system
 

Hi I got the road legal system because my previous experience of the Arrow race can was just too loud for the Sussex police. Thanks for your advice will go and see my local bike mechanic with the info. Have you got any experience of the dynojet kit I was interested in the pros and cons?

If you have the road legal kit then it will have a restrictive baffle in like the original.

It should not cause an issue.

Can you give anymore info to why you think the bike is down on power ??

predator system
 

Not exactly sure what makes me think the XT is down on power just seems different under hard acceleration. It has also popped a few times off the throttle but all the joints are well sealed, I will give it a nice long blast this week and report back.

A certain amount of over run is normal but popping is a sure sign of a lean mixture. The popping is unburnt air detonating in the exhaust.

Your Xt may not be down on power but It may feel like it.

The original exhaust is highly restrictive to pass emmision laws which gives flat spots in the powerband. As you come out of the flatspot you get a surge of power.

With an unrestrictive exhaust, the power delivery is smoother so you dont notice a surge which leads you to belive the power is down.

See what top speeds you can get and 100m sprint times etc.

predator exhaust
 

I think you have hit the nail on the head! The delivery does seem smother which could be fooling me. As far as the popping do I still need to get the exhaust gas analysis done?? Thanks for your help at one point the exhaust popped so loud I nearly fell off!

yes,that does seem a little lean with loud pops.

Maybe has somthing to do with the filter too.

Get a gas analysis to be safe.

Im after getting a full stainless system for my bike but i want a road legal system as the neighbours diddnt apriciate a race can @ 6am when i go to work :p

Can anyone put a link up to the predater system ? or the produro exhaust syatem ? i quite like the looks of the produro though

Link to Predator
 

stainless steel car and motorcycle exhausts - YAMAHA XT600 E (4PT1-7) 1995-04 TWIN SILENCER HANGER MODEL BSI E11 ROAD SYSTEM IN STAINLESS STEEL

Here is the link to the Predator road legal system i fitted to my 2003XT. I can highly recommend it. Just make sure you get some new gaskets and exhaust paste also available from Predator. Its not what I would call quiet but its legal so who cares!

Those nasty studs
 

Ted how did you go with your broken studs..
Mine had 1 broken stud, on removing the other 3 (after soaking in penatrine for about 2 weeks) I managed to snap another. I then decided to remove them all and replace them with Stainless studs. the threads in the head were so damaged by the original rusty studs I just Helicoiled the lot. Mind you my motor was (and is) out of the bike.
Consider that the Stainless studs will not be as tough as a cap screw and may only be as tough as a mild steel stud.. Point is they break.

I had to drill and collaps my broken studs. If you use an easyout be very careful. I expect it won't work and of course if you break it in there the job becomes much larger.