FCR41 questions

[thch]

Hi.
I'm quite new to this forum, although I've been a TRX owner for almost 2 years.
I hope some of you can offer me some advice:
I have a fairly standard TRX with a couple of Shark carbon exhausts (loud!) and a K&N airfilter in the original airfilter box. The bike is trimmed quite ok: it delivers 80.5 HP at the rear wheel.
I've been reading lots and lots of posts and have come to the conclusion that the best/easiest way to gain some horsepower is to replace the Mikuni's with a set of FCR41's. I was just about to buy a complete engine from Germany with a 870 ccm kit, but it was too much hassle and I think it was too expensive compared to how many extra HP it would give.
I've almost also bought Kayla's FCR41's, but she sold them just before I had a chance to transfer the money - bummer

I have decided to buy a new set, since it is almost impossible to find some second hand. (Unless one of you would be so kind to sell me yours?)

My questions are:
What do I replace the thick oil breather pipe with?
What air filters are the best (availability in the UK/Germany?) K&N cone filters or ramair foam filters?
With my setup, what would be the best main jet for starters?
Does one buy a complete set of main jets for the fine tuning, or does the FCR's work out of the box (considering the missing airbox and freeflow exhaust)

I plan to buy the carbs from BR Special Tuning in the UK as they have them in stock. Is this a reliable company?

Best regards Thomas, Denmark.

[trixynut]

http://www.motorcycle-exhausts.co.uk/pr ... ts_id=3987

Cost £661.09

Plus £100 for two filters and adapters



http://www.motorcycle-exhausts.co.uk/pr ... ts_id=4029

Or £795.97 for the 'full kit'

[Mincehead]

Ok, I`ll answer your questions in the same order that you posted them in.

The Cam cover breather can either be `vented` to atmosphere via a filter to stop any ingress of grit etc,(like mine) or it can be re-routed and fed into the filter.Assuming you`ll be using a RamAir type foam filter.

The Ramair filters (MS types):

http://ramair-filters.com/motorbike/fra ... rbike.html

Are possibly the best you can get, easily washed out and re-siliconed too.I`m using two seperate pods but am considering linking them via a corrugated hose in an attempt to create less chatter from the flatslides at tickover.
An experiment more than anything else to be honest.

The folk you`re buying them from, (if they`re worth their salt/any good) should provide them jetted to suit although obviously that`s simply a start point and a dyno is really best to get the fuelling spot on.

They`ll work out of the box but as I say you`ll definately need some dyno time too.
By the way, you`ll need new throttle cables too, don`t forget that.Oh and are you keeping the TPS (throttle position sensor)? If so you`ll need them to be equipped accordingly.
BR Special tuning? Their site looks good:

http://www.motorcycle-exhausts.co.uk/pr ... ts_id=4029

Damn good price that but watch the inlet stub lengths they come supplied with, I had to get some blanks from Allens:

http://www.allensperformance.co.uk/

Then turn mine up to suit my requirements.
The ones that were with my FCR`s were too short, the body of the carb would foul the oil filler neck.There are many threads on here about FCR`s just use the search facilities and start learning.
I had my old girl on a dyno at the weekend,(freebie run at a bike rally I attended) she`s now making 88.1 bhp so she`s dropped off a little over a year or so but not too bad for a 96`er, one of the first actually.
Totally stock bore, cams and just matching of inlet diameters done to the motor.You can expect another 8 to 11 bhp from fitting the FCR`s.

[thch]

Thanks for the reply - sorry for not answering sooner. Looks like the board has been down for almost 2 weeks....
I've been looking some more around different sites and had a chat with Allens performance. He recommends the Mikuni TDMR40 carbs instead of the FCR's - says that they're much better quality.
I had an offer for a set of second hand FCR's at about 450 quid but have decided to go for the Mikuni's from Kedo in Germany. They are selling a complete set (incl. TPS and cables) for something like 800 quid. Expensive, yes, but I want the best for my bike
(If you think about the registration fees on bikes in Denmark, the price isn't so alarming...)

Has anyone in here had any experience with the Mikuni's ?