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Re: 07 xt225 carb settings
[Re: kris]
#71496
10/29/10 03:11 PM
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Joined: Jun 2010
Posts: 585
Tigersaw
Bronze Member
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Bronze Member
Joined: Jun 2010
Posts: 585 |
Wow, 75 is warp speed! I can reach about 55 (GPS), though I don't want to fiddle with it because it has enormous grunt, I think it would climb trees if the tyres were better. I'll dig out and put the pictures up of me testing the float height, wont be until sunday or so though.
South UK
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Re: 07 xt225 carb settings
[Re: Tigersaw]
#71526
10/30/10 01:04 AM
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Joined: Sep 2007
Posts: 5,915
alexd
Platinum Member
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Platinum Member
Joined: Sep 2007
Posts: 5,915 |
I believe the "75 MPH" is indicated, not GPS measured. Most likely very high 60's, with the 14T.
Running the bike with the petcock off will test whether the petcock leaks, but I wouldn't rely upon it as a test of anything else. As the fuel depletes in the float bowl, the engine will momentarily rise in RPM, as it is momentarily running lean; this won't last very long, before it stalls and stops.
Alexd
(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
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Re: 07 xt225 carb settings
[Re: alexd]
#71546
10/30/10 07:26 AM
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Joined: Jan 2010
Posts: 2,366
kris
OP
Platinum Member
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OP
Platinum Member
Joined: Jan 2010
Posts: 2,366 |
i did have my chin on the tank at the time i was doing 75
kris............ give me more mud
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Re: 07 xt225 carb settings
[Re: kris]
#71547
10/30/10 08:26 AM
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Joined: Sep 2007
Posts: 5,915
alexd
Platinum Member
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Platinum Member
Joined: Sep 2007
Posts: 5,915 |
i did have my chin on the tank at the time i was doing 75 We all do that. But the Xt225 seems to test out under normal conditions (level road/ no wind) at about 73-74 MPH with stock gearing (which probably shows 80+ MPH on the speedometer). I think with the 14T, you'd max out a bit slower. Alexd
(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
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Re: 07 xt225 carb settings
[Re: alexd]
#71552
10/30/10 12:50 PM
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Joined: Mar 2010
Posts: 619
Dahrkstorm
Silver Member
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Silver Member
Joined: Mar 2010
Posts: 619 |
I can say with a 16T front sprocket I have reached 75mph indicated on gps. I never checked on gps when I had stock gearing.
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Re: 07 xt225 carb settings
[Re: Dahrkstorm]
#71564
10/30/10 08:16 PM
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Joined: Sep 2005
Posts: 179
pacopena
Member L1
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Member L1
Joined: Sep 2005
Posts: 179 |
I ran a 14t for a while and I think it went faster than with the stock 15t. Especially in hilly area's.
Paco
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Re: 07 xt225 carb settings
[Re: pacopena]
#71566
10/30/10 08:47 PM
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Joined: Sep 2007
Posts: 5,915
alexd
Platinum Member
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Platinum Member
Joined: Sep 2007
Posts: 5,915 |
I ran a 14t for a while and I think it went faster than with the stock 15t. Especially in hilly area's.
Paco There's no doubt that under CERTAIN conditions, a 14T might have a top speed greater than the stock 15T, such as a wind against you, or a slight uphill grade (or both). The XT225 doesn't have an RPM limiter, so there is also a question as to how high we want to let the little guy buzz and scream. Some (road-oriented) bikes with a high 6th speed gear are very well known to go faster in level, no-wind conditions with one tooth less on the counter-shaft. I would guess most. As example, my FZ1 is rated with stock gearing (no Mods) at about 153; repeatedly people have tested them at 155 with one tooth less counter-shaft. (Modded, they hit the rev-limiter at 165, with one tooth less) As a further example of gearing, Camaros and Firebirds with 6-speed manual transmissions have a higher top speed in 5th gear, than 6th. Alexd
Last edited by alexd; 10/30/10 11:45 PM.
(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
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Re: 07 xt225 carb settings
[Re: alexd]
#71569
10/30/10 10:11 PM
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Joined: Jun 2010
Posts: 585
Tigersaw
Bronze Member
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Bronze Member
Joined: Jun 2010
Posts: 585 |
Heres my check of the fuel level - just a piece of pipe attached to the drain plug and curled round. The manual states it should be 11-12mm below the mating surface, mine here is almost level And here is the reason - the float height measured at 12.5mm instead of 14.1-15.1mm I modified the float height, it made a difference to the running as previously mentioned, though subsequent checks show the fuel level appears not to have altered enough, so I may revisit the adjustment another time
Last edited by Tigersaw; 10/30/10 10:12 PM.
South UK
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Re: 07 xt225 carb settings
[Re: Tigersaw]
#71572
10/30/10 11:51 PM
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Joined: Sep 2007
Posts: 5,915
alexd
Platinum Member
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Platinum Member
Joined: Sep 2007
Posts: 5,915 |
Excellent pictures and write-up. Your example with your bike clearly shows why the float height measurement (generally) is superior to fluid height observations, with an external tube.
In theory, the fluid height method should be superior...but it just isn't, because there are other varying factors.
Alexd
(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
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Re: 07 xt225 carb settings
[Re: alexd]
#71574
10/31/10 01:29 AM
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Joined: Oct 2004
Posts: 1,072
Chartman
Platinum Member
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Platinum Member
Joined: Oct 2004
Posts: 1,072 |
The XT225 doesn't have an RPM limiter, so there is also a question as to how high we want to let the little guy buzz and scream.
Redline on Yamaha XT225 is about 9000 rpm.. Peak horsepower is at 8000 rpm.. When your're riding your XT225 chasing after KLR650s and KTM950s.. In example 5th gear at 90 kph.. Drop down to 4th gear and pin the throttle and accelerate.. And you then suddenly feel a lose in power (very noticeable).. That is how high you can let the little guy buzz and scream.. First time I hit peak horsepower and then beyond.. I thought what the #$%^&*.. I was accelerating going faster.. Hit this peak and my XT225 started decelerating I thought I blew my engine.. But luckily I didn't.. I just hit the point where more rpm gives less power (see below)..
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Board Upgrade:
Board upgrade to V7.7.3 has been completed on Monday Feb 3rd 2020. Ride safely.
Enjoy the new software!
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