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Can someone please tell me about this-link inside. Can someone please tell me about this-link inside.
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by George Guille, It's going to be a long 300km... Bolivian Amazon

I haven't been everywhere...
but it's on my list!


Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



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  #1  
Old 14 Apr 2008
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Can someone please tell me about this-link inside.
Was searching the net and found a link from this site to another - XT-Tipps
I have used online translators to try to find out what's being said,but I can't make it out.
What I'm after is the bit about half way down about drilling a bigger hole in your secondary carb slide plate.
What is this ment to do? When translated it doesn't really make any sense other than something about response.
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  #2  
Old 14 Apr 2008
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Response
- Ansprechverhalten
Im Sekundärvergaser hat der Unterdruckkolben eine kleine Bohrung im Boden. Es macht Sinn, sie ein klein wenig zu vergrößern. 3,0 - max. 3,5 mm Durchmesser. Das macht sich im Ansprechverhalten bemerkbar. (Hat aber rein garnichts mit mehr Leistung zutun).

It is about the little hole in the secondary slide that 'communicates' the vacuum in the throat to the top of the membrane. This vacuum lifts the slide, opens the throttle.
If you increase the diameter to 3 mm, from 1,8 mm, the response to opening the throttle will be faster, as more air can flow through the larger hole. No increase of power though.

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Old 14 Apr 2008
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right,.... faster throttle response, one of the cheapest way to do a bit tuning on the carb.
I done it on my Mikuni Carb for my KTM LC4 640, opened this holes from STD-6mm to 8.5mm-9mm but left the stronger STD spring to prevent bouncing of the slider for off-road riding.
The SuperMoto guys additionally fit a softer spring as well, but only move there bikes on tarmac, if used offroad or on bad tracks, the slider will bounce to quick and the result is a splutter in the carb.
Bike factories have to keep the set-up down to get there bikes road legal and usable for many conditions, tuning is not on there mind.

And yes change the jet's and needle and your bike will be all different, with a lot more fun factor in it.... ;o)
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Old 14 Apr 2008
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So instead of opening at 1/2 throttle as per normal,it'll open sooner? Is that how I'm reading that?
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Old 14 Apr 2008
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Originally Posted by Yobbo View Post
So instead of opening at 1/2 throttle as per normal,it'll open sooner? Is that how I'm reading that?
well sort of... ;o)
you will get a easier, faster and better throttle response with less effort on your gas hand, the vacuum will do a bit more of that job for you, more than STD, all part of the puzzle in addition with the bigger jets and needle game.
I was sceptical in the beginning too, but like it a lot now.

there are some rally people in Germany who are in to Yamaha bikes and speak English too, have a look at: Home
they sale all sort of tuning stuff specially for the XT bikes, and will tell you a lot on what sort of setup will be best for you and your bike.

As I'm riding a KTM LC4 I had all my data for tuning my carb from K T M - S O M M E R
I'm saying that be course it's not that easy to just throw any kind of bits together to find a good tuning, there are some tried and tested variations, but to open the slider holes up to the right size will be a start any way.... (don't over do it... 0.5mm to 2mm can make a big difference)
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Old 14 Apr 2008
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Thanks for that,might have to have a go at it in the weekend.
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Old 15 Apr 2008
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Not quite
The throttle will not open more, but will open faster. The stable throttle opening position will be the same, but will be reached earlier.

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Old 15 Apr 2008
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Just did it,took it out to 3mm,makes quite a noticeable difference.
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Old 16 Apr 2008
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Yobbo....What do you notice more now?
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Old 17 Apr 2008
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Just seems like more grunt from down low.I guess thats because both carbs are opening pretty close together.
Example being - give it full throttle,4th gear at 40km/h and it just takes off.It used to anyway,but you can feel a bit more surge or urgency about it.
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