Athena 170
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What would you do?
Take a full refund and buy a forged piston to the original Cylinder and mount that or take another Athena cylinder?
The carb is already set up for the Athena but it's not much work to set it back to stock.
Could the bike be worth more with the Athena?
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@irongamer727 I don't think so, if it were me in the market for a bike I'd rather buy stock or close to it and do the work myself.
Other people might feel differently but that's my 2p
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@glynn123 I'm so done with the big bore kits
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@irongamer727 I feel your pain bro
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@bananper Without a Dyno Graph it's hard to tell. But due to the port timings being way out, once you start climbing through the revs, the opportunity for the power to be made starts diminishing.
Hence why at low RPM's you have the extra CC's to help deliver more low down grunt, but the power tapers off and the gap between a stock barrel and Athena barrel starts to thin out. You definitely lose overrev with the big bore, so the stock barrel will continue to rev out further, allow you to zap out a few extra ponies with the help of porting.
Two strokes in general don't love over square engines, the fact that the big bore kit widens the bore whilst maintaining the stroke exacerbates this. A longer stroke is ideal for this kit. There is the potential then, for the longer stroke to correct the port timings, out by 3mm I'm led to believe, to actually correct the issues with the barrel.
But by the time you've done all that, you may as well have just thrown a 3XP0 cylinder and crank and be done with it.
I haven't the expertise or experience to really comment on how any of this translates. But it's just what I've read from various sites.
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I believe the dt200r is a 3ET barrel. Dt200wr and wr200 share the same 3xp cylinder which is nickasil plated but you can buy steel sleeves for them. I believe the dt200wr is autolube and has a tachometer at generator different dor the electrics
Also the dt230 cylinder and crank is a possibility
never seen this one done. -
Best option is to get your standard 125 barrel re-sleeved to 66mm then fit a Wiseco Forged Yamaha BLASTER YFS 200 Piston Kit 66mm. Piston gudgeon pin and small end bearing same size as dt 125, you will also need your head machining to suit. Kpm or Pjme will re-sleeve the barrel to 66mm and machine the head to match and also works out including forged piston kit and work to barrel and head less than half the price of the Athena kit. Also having a steel liner gives you the option of several rebores. https://www.ebay.com/itm/Wiseco-Yamaha-BLASTER-YFS-200-Piston-Kit-Top-End-Bearing-66mm-Std-Bore-1988-06-/173027889008?fits=Make%3AYamaha
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@2stroketerry very cool I love all the little Frankenstein things you can do to engines
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Wossner do a forged piston kit for the dt 125 that is 61mm and the absolute maximum can bore a dt barrel to. Gives around 146cc. https://www.ebay.co.uk/itm/Wossner-Piston-Kit-KTM-LC2-1991-2006-Yamaha-DT125-Over-Bore-61mm/371410153446?hash=item5679c52fe6:g:YI8AAOSwHnFVyn8J
