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-   -   Increasing the top speed ? ( https://www.xt660.com/showthread.php?t=11205)

weeksy 04-08-09 15:50

Increasing the top speed ?
 
Gents,

Anyone tried to increase the top speed with gearing ?

Is it the gearing or power or even the wind that's holding the XT back ?

I'm off on track and need more than the 109mph i've managed on it.

But if i swap to a 16T front for example, will it not top out and still only be 109mph?

Will the Air filter 1&2 give me any more top end ?

Is my quest for top end futile ?

I don't mind losing a bit of grunt for now... If i can get the top end gain from it.

CaptMoto 04-08-09 15:59

1 Attachment(s)
Hello weeksy... hmmm here we are again, there's a great debate XT vs R1? lol

You can change the sprockets on an XT *(see the attached excel spreadsheet, change the sprocket sizes to see how much you can get) but it's a 660cc xt after all, and a single cylinder bike at that, i.e. not designed to go over a certain speed, we've all been there trust me but the fun on this bike is on a twisty track on midrage power not on top speed.

weeksy 04-08-09 16:06

Agree with all the above mate... however ParcAlgar isn't 3 sisters sadly :)

It's more a Donnington than a Lydd :)

weeksy 04-08-09 16:56

the gsxr is fine from power and performance perspective. However it's a killer on the old knees (having had multiple surgeries on them) meaning that 3 days on track on the Gixer would be pure and utter hell.

The riding position and comfort of the XT660 is a good chunk of it's appeal for me...

JMo 04-08-09 18:55

Sell the Gixxer and buy a KTM 950 Super Enduro or SM...

(Gah! - I can't believe I actually recommended a KTM!)

xxx

weeksy 04-08-09 19:07

Quote:

Originally Posted by JMo (Post 102013)
Sell the Gixxer and buy a KTM 950 Super Enduro or SM...

(Gah! - I can't believe I actually recommended a KTM!)

xxx

LOL i sold a KTM950SMR 3 days before buying the XTX mate.

Had issues with having �6500 of bike sitting round doing nothing.

JMo 04-08-09 19:25

Hee hee - you fool!

I'm the same - got a Ducati Monster under a dust sheet - been out twice on it this year...

xxx

CaptMoto 04-08-09 20:18

Quote:

Originally Posted by JMo (Post 102013)
Sell the Gixxer and buy a KTM 950 Super Enduro or SM...

(Gah! - I can't believe I actually recommended a KTM!)

xxx

Yah, I want to have some serious words with you, sunshine!! :icon_clown:

haha

maxwell123455 04-08-09 20:58

It would in theory raise your top speed but its getting the correct slip stream and enought power to get up to that speed.

I ran the standard gearing and got at least 105mph + but changed to the same as a 16tooth up front (i changed the rear as it came up here by WB) and could only reach 100mph flat stick, then again i did have a tank bag, tall screen, avon distanizas (semi knobbly tyres) and a fat 15stone rider

I would say get the stage 1 and 2 filters first, then get a 16tooth sprocket but also take the standard 15tooth with you as someone will be able to change the front sprocket back to the standard one if you want/find your not using it enough.

weeksy 04-08-09 21:14

Quote:

Originally Posted by maxwell123455 (Post 102029)

I would say get the stage 1 and 2 filters first, then get a 16tooth sprocket but also take the standard 15tooth with you as someone will be able to change the front sprocket back to the standard one if you want/find your not using it enough.


LOL i've just re-built a GPX750R from scrap and a 600SRAD from a non-runner. I rekon i can manage to fit a sprocket mate ;)


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