Yamaha TRX850 Enthusiasts Forum

Is there a limmiter on a trx?
if so at what is it set?
i am always running well into the red and really dont want it to go bang
maybe I am just trying to hard but you gota luv it on full chatter



Cheers

Garry

Mate,
there is a limiter.
But theres no point going near it on a TRX. Makes all its power and torque lower down the revs. Search on here for dyno printouts and you will see what I mean.
Dave

Gixxerm8 wrote:Is there a limmiter on a trx?
if so at what is it set?
i am always running well into the red and really dont want it to go bang
maybe I am just trying to hard but you gota luv it on full chatter



Cheers

Garry

On stock gearing? You`ll be lucky to get to the red line in top too often that`s fer feckin sure, especially on a stock motor!
As Trixynut states, there`s no point, peak torque and BHP is well before the redline anyway.

Last time mine was on the dyno, the mechanic was worried it didn't have a limiter. I told him i've hit it but was to busy on the track to notice what the rev's were. So when he got the jetting right he found the limiter at 9200rpm, and it was still pulling hard to that point. I do have 41mm flatslide's and akra system but rest is standard, a smidge under 84hp. Went well on the track the next day. I is one happy samboy.

My experience mirrors general comment above.

On a stock motor mine would not get near the redline in top even on the long Snetterton back straight.

Now with 878JE kit, Akro headers/Devil can, stock carbs and 17/42 gearing it willingly pulls to 8k in top. I avoid over revving into the red as much as possible (on over run as well) because 91mm pistons are pretty damned heavy and there's no real gain from doing so. I can stay with the pace of my brothers 2003 Z1000 out of Clearways at Brands revving to 8k and only lose perhaps 5yds on him before braking for paddock (where I get it all back!). Stock TRX rods are reported to be reliable even in tuned motors but why take the risk?

Don't know if anyone has ever tried a slipper clutch on a TRX to avoid excessive revs changing down? Probably not because of £600 cost. I never really got what they were for but now I am consumed by the world of big twins I suspect it could give a real performance advantage (more rear end cornering grip and reduced rpm on over run). Better to spend the cash on FCR's maybe though I missed the ones on the forum this week. Drat.

If you enjoy high revving bikes I'd buy a 600 inline four...........

A not so dim reply misterdimwiddy.
I agree wholeheartedly, a slipper clutch for track use would bring a huge advantage, those big pistons and twin balancers carry a lot of inertia to slow and remember you`re using a stock gearbox too, that`ll be `feeling` the strain as well.

Now you have got me thinking Mince.

I have seen a slipper clutch kit for the SV650 (for obvious reasons) and wonder whether Sigma do one for any other (older) Yamaha that may be adaptable for the TRX. May be worth a quick call/email but I doubt it as demand must be minimal. Funny how the original limit of your planned TRX mods gets continuously extended.

Going off original subject a little but taking my immaculate SP1 to Snetterton for the first time this month (EEEK!.............hope its dry) which may convince me to buy a slipper unit for that instead!

misterdimwiddy wrote: Don't know if anyone has ever tried a slipper clutch on a TRX to avoid excessive revs changing down? Probably not because of £600 cost. I never really got what they were for but now I am consumed by the world of big twins I suspect it could give a real performance advantage (more rear end cornering grip and reduced rpm on over run). Better to spend the cash on FCR's maybe though I missed the ones on the forum this week. Drat.

If you enjoy high revving bikes I'd buy a 600 inline four...........

I have been using slipper clutches for years on supermoto and love them but could not find one for a TRX...please point me in the direction.
They make the bike soooo much more stable entering corners fast and cranked over... use one and you will always want one

Sigma do a TDM900 slipper clutch:

http://www.sigmaperformance.com/slipperclutchrange.html

I had a pm from misterdimwiddy who was asking about suitability for the TRX, I cannot at this point, confirm whether it`ll fit the TRX or not. Anyone else know?

cool, go in my TDM900 motor nicely

edit: mebees later if I am feeling flush

Cheers Peeps

I just alwats seem to look down and its way up above 8 almost 9 k pushing

seems to need to be on the boile ( above 6.5 ) to want to perform its totaly stock apart from the Venom cans Sounds good tho

maybe I am just looking for TLR/Rsv performance out off my Trx



Garry

Interesting email response from Sigma copied below;

As far as we know it will go straight in.

We have also discovered that our Yamaha TDM 900 (£549 plus VAT) clutch fits a load more bikes than we thought.

In addition to the TDM 850/900 model range of bikes this clutch will also fit as follows:
1987 > FZ750
1987-88 Genesis FZR-750 and 1000
1989-90 Exup FZR1000
1989-90 FZR750 OW01
1991-96 FZR1000
All YZF750
All YZF1000 THUNDERACE
And more than likely the FZ750 1985> 1987. The basket while taking the same plates etc was rubber mounted. It should however just drop in.

Interesting to hear from Gix that he rates the performance of these units so highly. May be a winter mod for me later this year.

Very interesting, cheers for the update from Sigma.

just over $830 AU plus postage.
hmmmmm . . . . . .
thats just under half my new trackbike if it comes together
cheers
fung

Slipper clutch???
Never had them in the days of RD/TZ motors - ya just didn't fully engage the clutch on downchanges - also saved the engine nipping up on the overrun.........maybe I'm an old fart but I could by a lot of tracktime/fuel for £600!

Edit, I am an old fart.........