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DT125R Forum -> TZR125 -> tzr gearbox
Post Info TOPIC: tzr gearbox
NORFE


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tzr gearbox
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are all years tzr/dtr crank cases the same???90-02 

tzr gearbox is better for road based used not as high geared like the dtr???



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DT-R_bradders


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i think the ratios in the box itself are the same just the final drive is alot different , rear sprocket on a tzr is tiny compared to a dt one

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NORFE


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was looking in manual earlier there, tzr has different ratios non 3-4-5-6 if i remember right
whats the smallest sprocket u can get on the bk od the dtr do u no as i was looking earlia and the hubs r big rnt they

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brunoktm


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hi 

I hope to help with this

 

 

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good drive
NORFE


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yeah i new they were difrent seen it in the manual, the tzr box is better geared for the road,,im gonna put one in when i rebuild my enginesmile



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mr karnage


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might so it with mine seen as its in bits :D

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NORFE


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be better mate iv seen tzrs do over 100mph on dyno's



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mr karnage


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just compared some graphs on both gearboxs with standard gearing

you would have to get a 520 conversion for the dt and use the only available 17/47 sprockets to get the same gearing as the tzr

on standard gearing with a tzr gearbox the dt would do 81 mph at 11000 rpm in 6th gear


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Benneyboy


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NORFE wrote:

be better mate iv seen tzrs do over 100mph on dyno's

 

 

nuff said aint it lol , the internal ratios are diffrent for sure ,  i would do it mate it makes sense although at the same tim i would look at having the ports and transfers played with to get the best out the whole package while youre in there



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my bikes aprillia af1 125 (striped down  project ) , honda mt 50 : h100 engine rebuilt all by me along with the crank !, supermoto wheels , motorhispna swing arm , usds forks , geneli pipe , more stuff planned looking to get another dtr soon though !
NORFE


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yeah mate deffo looking for one at mo



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the only way is YAMAHA DTR


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the tzr crankcases are different, look

wil the internals fit?

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Energized


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Good eye bud doesnt look like the internals will fit tbh



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after 1993 (best year evewinkr)

the cases look the same as the dtr



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mr karnage


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its the 4dl thats exactly the same

just has a little different bracing

ive put a tzr gearbox in mine and it fit, only thing different is the sprocket mount. so you need to get a tzr sprocket

had to take it apart because the bearings had too much retaining glue on lol

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eG x LoGiKzZ


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mr karnage wrote:

its the 4dl thats exactly the same

just has a little different bracing

ive put a tzr gearbox in mine and it fit, only thing different is the sprocket mount. so you need to get a tzr sprocket

had to take it apart because the bearings had too much retaining glue on lol

 

did you notice any difference with the tzr gearbox?



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mr karnage


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havent managed to get it in the bike yet

engines back in bits

bearings stuck to the crank at moment and im waiting on a bearing splitter

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Calum122


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NORFE wrote:

be better mate iv seen tzrs do over 100mph on dyno's

 Tuned or standard?

 

They're less BHP than the Aprilia's and a standard Aprilian will struggle at that feat.

Aprilia will be a faster racing machine than the TZR



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mr karnage


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tried getting the engine back together and found this

they are the gearbox shafts that go through to the clutch side, not the one that the sprocket fits onto

dtr shaft at the top, its around 3mm thicker.  means the tzr shaft has alot of play when its put through the bearing

scaled.php?server=232&filename=dsc0034nng.jpg&res=landing

 



-- Edited by mr karnage on Saturday 9th of June 2012 10:41:34 PM

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the only way is YAMAHA DTR


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can u just put a DTR bearing in there?



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NORFE


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the top one looks seriously worn lol, its like its concaved wear on the end off the shaft

was it the same size to start with?

measure it at the 1st gear end where the shaft starts



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NORFE


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the thin part is inside the clutch int it the bit that the bearing sits in it the thikker bit at the bottom b4 the gear

did u try it in ot is it just sumet uv noticed like pal??



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NORFE


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but like sed b4 just swap bearings



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mr karnage


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im using a dtr bearing

the dtr shaft is the thicker one and it fits, youve got it spot on norfe, the bearing sits on the thicker part

i started putting the engine together, then when i put the casing on there was play on that shaft

took it apart and compared the shaft to the dtr one and thats what i found

im swapping the dogs over, there only held with circlips. easier than swapping bearings and my mum will flip if i put the casing in the oven again

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mr karnage


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the shaft looks worse in the pic lol

its not worn in the middle where it looks like its concaved lol

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mr karnage


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had a look at some tzr gearbox's on ebay and it seems like ive picked up a early 90's box

the 4dl and 4hw have the same shafts as the dt





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