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yz 125 2004
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moto28
New User
| Posts: 11
| Joined: 10/09
Posted: 10/26/09
08:09 AM
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can any one give me any advice when i'm riding top end of the gear ratio flat out, its not a smooth ride seems to be holding bk like its not getting enough fuel or there is air getting in. i have recently had my piston changed. all my seals re-done and my forks re-done could it be anything to do with the jets? i am new to this so i'm a bit unsure any advise would be great. 
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Force
Guru
| Posts: 895
| Joined: 05/09
Posted: 10/26/09
08:17 AM
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Welcome to the board moto!
When the new piston was installed, were new rings, pin, bearing, clips etc. everything installed aswell? and in what shape was the cylinder walls? is the air filter clean?
If all that is in order, it could be a dirty carb, or the jetting is too lean/rich.
If it's not that i'd also check the reeds.
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2006 YZ250
- FMF Gold Series Fatty
- Yamaha Racing Graphics Kit
- Twin Air Filter
- Vforce 2 Reed Valves
- Clarke long range tank
- Cycra Handguards
- Longhorn Triple Clamps
- Pro Grip-Grips
- Pro Taper Handlebar
- Renthal o-ring chain and sprockets
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moto28
New User
| Posts: 11
| Joined: 10/09
Posted: 10/26/09
11:50 PM
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ok mate thanks for the advice ill have a good look at these areas cheers.
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Force
Guru
| Posts: 895
| Joined: 05/09
Posted: 10/27/09
12:51 AM
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Ok no prob! let us know how it goes! good luck!
<><><><><><><><><><><><>
2006 YZ250
- FMF Gold Series Fatty
- Yamaha Racing Graphics Kit
- Twin Air Filter
- Vforce 2 Reed Valves
- Clarke long range tank
- Cycra Handguards
- Longhorn Triple Clamps
- Pro Grip-Grips
- Pro Taper Handlebar
- Renthal o-ring chain and sprockets
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moto28
New User
| Posts: 11
| Joined: 10/09
Posted: 10/29/09
10:04 AM
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my bike is in the garage 2 morrow think my jet has a slight crack in it so it must be dragging in air as well as fuel cheers so ill let u no the outcome.
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Force
Guru
| Posts: 895
| Joined: 05/09
Posted: 10/29/09
10:18 AM
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Ok good to hear you've found the problem!
Wonder how the jet cracked? Did it over heat or somethin at some stage that you know of?
<><><><><><><><><><><><>
2006 YZ250
- FMF Gold Series Fatty
- Yamaha Racing Graphics Kit
- Twin Air Filter
- Vforce 2 Reed Valves
- Clarke long range tank
- Cycra Handguards
- Longhorn Triple Clamps
- Pro Grip-Grips
- Pro Taper Handlebar
- Renthal o-ring chain and sprockets
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Force
Guru
| Posts: 895
| Joined: 05/09
Posted: 10/29/09
10:20 AM
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Which jet was it (main, pilot...?), lol just curious.
<><><><><><><><><><><><>
2006 YZ250
- FMF Gold Series Fatty
- Yamaha Racing Graphics Kit
- Twin Air Filter
- Vforce 2 Reed Valves
- Clarke long range tank
- Cycra Handguards
- Longhorn Triple Clamps
- Pro Grip-Grips
- Pro Taper Handlebar
- Renthal o-ring chain and sprockets
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moto28
New User
| Posts: 11
| Joined: 10/09
Posted: 10/31/09
02:44 AM
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it is the main jet that needs to be replaced and just to top things off i dropped the bike and ive broke the front brake server unit,so now i have no front brake i do kind off tho i just have to pump the brake as it loses compression easily never mind aye.
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Force
Guru
| Posts: 895
| Joined: 05/09
Posted: 10/31/09
02:49 AM
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Oh geez man sounds bad! Hope you didnt get hurt?
And yeah the main jet sounds like the problem, because of the unsmooth revs when flat out, and the main jet regulates that area.
Good luck with the front brake and all now!
<><><><><><><><><><><><>
2006 YZ250
- FMF Gold Series Fatty
- Yamaha Racing Graphics Kit
- Twin Air Filter
- Vforce 2 Reed Valves
- Clarke long range tank
- Cycra Handguards
- Longhorn Triple Clamps
- Pro Grip-Grips
- Pro Taper Handlebar
- Renthal o-ring chain and sprockets
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moto28
New User
| Posts: 11
| Joined: 10/09
Posted: 10/31/09
03:15 AM
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cheers geez.
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moto28
New User
| Posts: 11
| Joined: 10/09
Posted: 11/13/09
10:43 AM
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finally got my bike back had new main jets and my brakes r sorted so off down the track 2morrow to test it out properly finally back to riding again. 
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