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DT125R Forum -> Tuning -> yz head on dt
Post Info TOPIC: yz head on dt
rob patton


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yz head on dt
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i been told that the yz head fits the dt is there a compression difference or no ???



-- Edited by rob patton on Tuesday 31st of May 2011 10:31:28 AM

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NathanDavies


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LOL does it?

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midnightbikerjames


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i heard nearly nothing can be swapped over from the yz to the dt, i may be wrong though ?

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CooS


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If you was to do that mate I would just lob a yz125 full block in the dt frame and call it a good one till it needs a strip down which will be very soon!! :)

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rob patton


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this not look like it will fit to you ???

http://cgi.ebay.co.uk/Yamaha-YZ-125-1983-1984-Cylinder-Head-Motocross-MX-/150322020313?pt=UK_Motorcycle_Parts&hash=item22ffe3ffd9

http://cgi.ebay.co.uk/GENUINE-YAMAHA-CYLINDER-HEAD-FITS-01-02-YZ125-/270744008532?pt=UK_Motorcycle_Parts&hash=item3f0999b754

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Seiki


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You want to put a 1983 YZ cylinder head on your DT?

what are you planning to gain?

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rob patton


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Seiki wrote:

You want to put a 1983 YZ cylinder head on your DT?

what are you planning to gain?

 more comprission n i wound but the 01 - 02 1 on if i did i was just useing the 1983 to show that you dont have the bumpey bit going around like on the 3bn

https://i294.photobucket.com/albums/mm116/oldgitonabike/DT125R/De-Restricting/DT125RHeads.jpg



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mammoth200


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Surely the stroke of the engine differs? You'll likely find that if you bolted a YZ cylinder and head on, you'd end up mashing the piston into the head, or you'll end up with a massive squish gap and no compression.

To be completely honest, unless the engines were identical (which they aren't) I wouldn't bother risking it. the basic layout of the head will be the same (saves on initial design costs) the finished result will be vastly different.

That's just my two cents anyway.

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rob patton


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whats the best way of getting more power out of my dt and i was also wondering if a wr 200 top end would fit ???

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mammoth200


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There is only so much you will be able to do before it ends up costing you a small fortune mate. Honestly, if you really want to cram every ounce of power from it, fit one of the Athena 170cc kits on it.

Other available mods would be to get your head ported (as previously mentioned) bigger carb, aftermarket exhaust (or a gutted standard exhaust) airbox modifications, and changing your sprocket sizes.

Or pass your bike test and get a 250 2-stroke. Which in the long run will be cheaper.

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the only way is YAMAHA DTR


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hi, it might fit but the compression may be to high and the engine will start pinking, bend con rod and blow hole in the piston. the best way to raise compression is measure squish clearance. skimming over 0.4mm would be risky. or try running without a head gasket and use silicone instead.

is your head 3mb or 3bn, i fitted the 3mb (on the right in pic) because its higher compression. http://bikepics.com/pictures/2184568/

or stick this in your bike LOL http://cgi.ebay.co.uk/Yamaha-TZR-250-2MA-Engine-Complete-/190539507839?pt=UK_Motorcycle_Parts&hash=item2c5d0a287f 

with some tdr 250 Pipes

 

 



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jack_p92


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the bolt holes are in completly different places anyway it looks...

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fuggie


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yup, just dug up a 1986 yz head out of my old spares and lined it up with a dt barrel for a laugh, the stud holes aren't even close lol!

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ToySoldier


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a dt is a dt not a yz u want a yz buy one and reg it up outher wise stick with what you have

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