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DT125R Forum -> Tuning -> speed help
Post Info TOPIC: speed help
1990dtr (aka THIEF)


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speed help
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well now iv had the engine rebuilt and run in etc il pulls like tarin well happy but in 6th it feel like if there was a 7th it would do 90 easy but im in 6th feel like iv got loads of power but just wont go any faster cuz the standerd cogs are going as fast as they can go how to i get a better top end with out screaming the bike ?



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james
Seanyftw


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Change your gearing mate, think it's 16 front teeth normally? Go up one and you'll get more top end. I think lol

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NORFE


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iv fitted 17-55 see what its like when im out

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1990dtr (aka THIEF)


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yeahh norfe i was think 17 -18 maybe just seems like the engine could do more :/

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NORFE


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http://www.ebay.co.uk/itm/Yamaha-DTR-125-DT-125-R-Rear-Sprocket-55-Tooth-90-03-/350485753653?pt=UK_Motorcycle_Parts&hash=item519a942f35

smile



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1990dtr (aka THIEF)


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with that rear sprocket plus a 17-18 toothed front one on a good engine what top end would you hope to get norfe ?

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james
1990dtr (aka THIEF)


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witch out redlining everywere loool

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james
NorDt


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Whats your topseed atm ?

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1990dtr (aka THIEF)


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well its pulls like a train through all the gears does bout 70 75 redlining not that iv tried but it seems witch the right set up the engine would do a bit more ie 80 85 ?

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james
NorDt


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Your redlining at 70-75 ? What sprockets do you have ?.

Your bike all standard ?

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1990dtr (aka THIEF)


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yeah pritty much and it feels like i could do so much more yeah front it standard 16 nd raer i havent a clue i guess stand

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james
NorDt


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Okay, Well, Put on a gianelli exhaust ( thats my opinion on whats the best exhaust ) Adjust the exhaust valve to open up a bit more than it does standard, Get a bigger jet. With that only you should do 90 mph, or 140 kmh.

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1990dtr (aka THIEF)


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well the exsaust vale is fully open iv gt a dep backbox next i was going to up grade the sprockets cuz the power is there just need the bigger sprocket to convert that to top end speed

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james
NorDt


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i even seen someone claim to do 95 mh, Thats our of the clock, but when i had the standard barrell i would go out of the clock on the speedo. That would be when there was little or no wind. Couldnt do 140kmh if there was windy.

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NorDt


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A gianelli xpanny would help alot dude. Your bike will fly. I could wheelie in 2nd easily, and even third gear. Could make the front wheel lift in 4th, but could never get any real wheelies in 4th.. damnit im starting to miss my stock barrel.

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1990dtr (aka THIEF)


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were can you get one from ? cuz i kno the standard is full of ristricters

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james
NorDt


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Im from norway, you proboably doesent want one sent from norway, but proboably ebay ?.

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1990dtr (aka THIEF)


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not one on ebay atm really im after anything non standard ie dep or summin alone the lines

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james
1990dtr (aka THIEF)


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along

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james
NorDt


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Dep is pretty good too, But i think gianelli has a stronger kick, And is a more fun exhaust for wheeleing. my front wheel went up alot easier with my gianelli than when i tried my friends dep.

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1990dtr (aka THIEF)


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really well if i find one i might have to have a look into it

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james
NORFE


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just de restrict the std one, if u cant find one pal



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1990dtr (aka THIEF)


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mine is standard mate well the expanny is

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james
NorDt


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Norfe, How does a derestricted standard xpanny go ? are they any good compared to a gianelli ?

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1990dtr (aka THIEF)


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norfe this a a 17 front 55 back what you think ?

http://www.ebay.co.uk/itm/YAMAHA-DT125R-DT-125-R-DTR-125-CHAIN-SPROCKET-KIT-SET-/180728654423?pt=UK_Motorcycle_Parts&hash=item2a14446a57

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james
NorDt


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it sais YAMAHA DT125R 88-98

17 TOOTH FRONT

55 TOOTH REAR

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1990dtr (aka THIEF)


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yeah yeah thats it

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james
NorDt


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Is there a reason the kit is 17-55 ? Is 17-57 too heavy ?

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NORFE


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no mate just an alturnative option 

there all heavy

renthal do a 520 conversion also if you wanted to look in to that for sizes n materials




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1990dtr (aka THIEF)


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they also on ebay ?

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