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- Fuelling and Intake ( https://www.xt660.com/forumdisplay.php?f=207)

- - Fuelling Fix ( https://www.xt660.com/showthread.php?t=55)

Quote:

Originally Posted by Denny (Post 50043)

What's the difference between the 2 pot & single pot?

A POT!!!!!!!!!

sorry you asked for that one Denny:bootyshake:

Exact Captmoto!!!!
I want to know this (.... the effect of the 2 knobs covers the whole range or just a specified range......)
Kev Captmoto, do you have the graphic of Stoichiometric ratio relatively to installation of kev mod?
An image like this for kev mod.
Thank you, Maotheb1ke.

Yes we have something similar, have a look here:
http://www.xt660.com/site/node/53

it's all explained in there together with graphs of dyno result with and without the mod.

http://www.xt660.com/site/image/view/89/_original
http://www.xt660.com/site/image/view/90/_original

yes, but there is no stoichiometric ratio..... the most interesting!

Sorry for the slight hijack but.........

Looking at the 2 graphs above it appears that the Kev Mod causes the HP & Torque to come in at about 1000rpm higher than standard, is that correct?

Thanks,

Nick.

Quote:

Originally Posted by NickW909 (Post 50080)

No that is not correct, the RPM difference at the start of the dyno runs are different because the reading was started at different times/rpms.

Quote:

Originally Posted by maothebike (Post 49975)

Hi, please help me kev and Captnmoto .... I am Italian boy and I installed the kev mod with two variable resisters on my xtx 2005.
I would like to know, where is the enrichment mixture when I turn the variable resisters on the air/coolant sensor, ie...... what is the range of engine rotation where the sensors act???? .... enrich down range or high range?
Excuse my bad English ..... bye
Maotheb1ke.

PM sent with details.

Quote:

Originally Posted by Kev (Post 50082)

No that is not correct, the RPM difference at the start of the dyno runs are different because the reading was started at different times/rpms.

Kev, Thanks for clarifying that, thought it didn't look right.

Nick.

Thanks kev; the document is exhaustive.
But I can see the stoichiometric ratio (air/fuel) with kev mod? Do you have the dynamometer graph?

I do not have the print out of these tests, I ran these tests over 2 years ago & did not use link software but used a 4 gas analyser. The Air/Fuel ratio ran between 12.5 low down to 3000rpm the up just over 13.5 in the upper revs with all my mods with the fuel device connected.

With using the Yamaha fuel map you can not change the mapping every 250 RPM like a power commander can do. You can only change the fuelling over the whole range by but adjusting the temp senders down in temp.

With these fuel devices I tried to get the fuelling better in the low revs where we have the main problem with lean mixture, the 04 to 06 bike are still a little lean in the higher range but still safe & better then not having the fuel mod. The 07> 08 models are different again these bikes are lean low down & to rich from 60% throttle so a bit harder to get these one right.

The two pot fuel mod that you have was one of the very first mods I ever made. I stopped making them because I had one rider out of 46 2 pot mods sold make his bike to over heat, he did not set the mod correctly which cause the bike to over heat. I then came up with a different resistor that could be used on the air temp sender & was much safer.