Carb kits needed?

[Deano]

Hello all,

This might be a bit of a repeat, my recently bought TRX seems a bit jumpy on a slight throttle, for example when making slow turns at junctions. I am new to the big twin thing, having had mostly four cylinder bikes before.

I have read quite a few threads regarding carb wear and so I thought I'd pose the question. The bike has 21000 miles on it which seems genuine according to the old MOTs and the general condition.

At what sort of mileage would I be expecting to overhaul the carbs? I have adjusted the slack in the throttle cables to factory settings, which has improved matters slightly.

For around £100 for a pair of kits it doesn't sound unreasonable, but maybe I just need to get used to it?

Your thoughts would be appreciated.

Deano.

[Snod Blatter]

The emulsion tubes in mine were well worn by 21K..

What's in the kit?

[Deano]

Hello SnodBlatter,

The Keyster kits come with just about everything I think, Tubes, needles, jets, float valve. They dont have the air shut off diaphragms, these are available seperately.

I'm guessing it wouldn't hurt to do the carbs at the mileage I have. At least that way I know I'm working from a baseline.

[Overlord Neil]

I just bought (yet to receive) a Factory Pro kit from the states, its not a cheap kit but they are the only people (i could find) that sell a nickel plated emulsion tube, which supposedly eliminates wear. Emulsion tubes, jet kit and manually adjustable fuel screws (longer and knurled for finger adjustment, rather than squiffy screwdriver) cost me £200 including delivery, I also bought seal kit A & B from Litetek in Thailand, another £30 including delivery. £230 for everything bar the diaprghams, fingers crossed the current ones are still good!

Allens Performance quoted me £230 for everything (including Diaphragms)

The version I got was that the OEM brass emulsion tubes can wear out [oblong] after as little as 5k miles, mine is now coming up to 45k miles, as the emulsion tubes oblong you get a two fold problem; more fuel and bigger dropplets so efficieny is out the window. I couldn't justify the £1000 pounds+ for a set of upgrade carbs, so I showed the standard CV's some love.

[Deano]

Overlord,

Cheers for the information.

I take it that you have already had the OEM parts from Allens and they wore out again, that is why you have gone for the Factory Pro Kit?

Perhaps I should dig a bit deeper and do the job once.

Deano.

[dandywarhol]

I echo Neil's advice. Factory Pro tubes but with stock Yamaha needles. The FP needles are a much steeper taper and I found it very difficult to get the low speed running right.

Litetek Viton seal kits are excellent and plenty oinfo on their website http://litetek.co/

[Deano]

Thanks, getting some good info on here.

Cheers,
Deano

[Overlord Neil]

Deano,

No, I think a previous owner used a Dynojet kit, performance is ok but I don't have a yardstick to compare against. I've put 10,000 miles on my TRX already and I'm going to put a lot more on yet so even if i get a marginal improvement [economy] it will be worth the outlay. I went with the FP kit as it made a big deal out its low RPM performance, which is where I do all my riding, so its interesting dandywarhol saying about the trouble getting a good slow running set-up. Good to know if I'm struggling that it might be the kit and not my hamfistedness!

If you can hold off a couple of weeks I should have had a chance to fit my kit, put a few miles on and can report back.

[dicky]

I also recommend the Factory Pro tubes but keep the stock needles.
The FP needles have a very different taper along almost the entire length, very steep at the pointy end which is the low/mid throttle opening.
I fitted them and it ran like a dog. Put the originals back in and it purrs like a kitten.

[pbear62]

Yep - Factory Pro emulsion tubes & genuine needles sorted mine out too