FCR 39 or 41

[Wombat]

And wouldn't 39's solve that problem with enlarging the inlet rubbers that you have to do with 41's?

Seriously considering looking at 39's now

Bob

[steve speed]

And wouldn't 39's solve that problem with enlarging the inlet rubbers that you have to do with 41's?

Seriously considering looking at 39's now

Bob

the problem you disscribe took me about 10 mins to sort ,,but getting the jets somewhere near has taken a lot longer ,,both 39s & 41s are a shed more power than the 38 miks

[Wombat]

There's a set of 39's on EvilBay right now with about 5 days to go. Trouble is that they're for a Ducati 900SS, and therefore no TPS. Would I be right? What's the mod to disable the TPS anyway.
What's the Mikuni flatslide equivalent?

Bob

[Tarwetijger]

There's a set of 39's on EvilBay right now with about 5 days to go. Trouble is that they're for a Ducati 900SS, and therefore no TPS. Would I be right? What's the mod to disable the TPS anyway.
What's the Mikuni flatslide equivalent?

Bob

Don't know about the Duc thing but Mikuni flatslides are TDMR, 40mm, available at KEDO and TÜV geprüft!

[dirty trix]

What about the Keihin FCR40mm common on the MX bikes with the accelerator pump? Sure you would need to get two....

[steve speed]

i dont think they are down draft carbs !!!!!

[Kayla]

What about the Keihin FCR40mm common on the MX bikes with the accelerator pump? Sure you would need to get two....

I looked into doing it 'on the cheap' but the FCR-MX carbs are sidedraft and the TRX head is downdraft, plus you'd have to arrange some way of ganging the carbs together*.

*I reserve the right to be wrong.

[dirty trix]

Good point......

Cant see any 39's or 41's or even the Mikuni TDMR's at present, so was just fishing.

Have to see what 39's go for.....

Hmmm just posturing... much as I love my TRX if I did half the stuff I want to it it would cost me more than buying a 904ie monster and still only have a 5 speed box.....

[idl1975]

From the perspective of a 39 owner...

...bags more grunt all over, instant throttle response and of course 15 extra horses.

That's answered one of my questions, thanks I'd have expected better response and a bit more power and torque but that's a huge increase for a relatively small cost.

My bike, with non-expert dynojetted for K&N + micron slip ons made 79 bhp on Specials of Glasgow's dyno back in the day - if you already have cans on the bike, the extra £300-400 would seem to get you 6-10hp without head work or the 878 kit. Yours isn't on stock exhausts, is it?

Not that I'm saying FCRs aren't da sh** though, 'cos of course they ARE.

[phuk72]

If you want flatslides on the cheap get onto ebay usa and have a search around in the snowmobile section. Most (if not all) of the 2T skidoos etc use flat slides and some patient searching will find you some downdraft carbs.

I managed to get a set delivered for less than £100. Of course you will have to rejet, respace, make spiggots and velcoty stacks but it can be done. I got a set of FCR41s cheap so never finished (well actually other than having them in the garage I never actually started)

[Kayla]

From the perspective of a 39 owner...

...bags more grunt all over, instant throttle response and of course 15 extra horses.

That's answered one of my questions, thanks I'd have expected better response and a bit more power and torque but that's a huge increase for a relatively small cost.

My bike, with non-expert dynojetted for K&N + micron slip ons made 79 bhp on Specials of Glasgow's dyno back in the day - if you already have cans on the bike, the extra £300-400 would seem to get you 6-10hp without head work or the 878 kit. Yours isn't on stock exhausts, is it?

Not that I'm saying FCRs aren't da sh** though, 'cos of course they ARE.

Mine's got aftermarket pipes on standard headers (with the trumpety bit cut off the airbox). I spoke to PhilK about his FCRs over the weekend and I'm buying them off him when I get paid next week

[dirty trix]

My bike, with non-expert dynojetted for K&N + micron slip ons made 79 bhp on Specials of Glasgow's dyno back in the day - if you already have cans on the bike, the extra £300-400 would seem to get you 6-10hp without head work or the 878 kit. Yours isn't on stock exhausts, is it?

Mine has an 80.4 RWHP dynograph at 90,000+ kilometers, stock carbs with worn needles and unknown jetting, gutted stock pipes and K&N. As to what that means, not much. A dyno result is easy to tweak, but on seat of the pants feel and it's ability to lift the front that feels about right.

As such, dynojet horsepower gains are probably maybe 1-2 horsepower max and the rest of the difference is dyno variation or production tolerance variation? I had promised to get a dynojet kit done for mine if I hadnt scored some FCRs or some TDMR's..... No FCR's and still no dynojet kit.

[steve speed]

well done kayla welcome to the dark side

[Kayla]

well done kayla welcome to the dark side

Thanks! I talked it over with my bf and we decided to get some nice stuff for our bikes with my redundancy payment and we're going to the Manc bike show too

[steve speed]

well done kayla welcome to the dark side

Thanks! I talked it over with my bf and we decided to get some nice stuff for our bikes with my redundancy payment and we're going to the Manc bike show too

are you going to the manchester bike show to buy sweets ?? because thats all they sell ,, save your money for main jets for your FCRs