TW200/TW125/TW225 engines - similar?
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Thread: TW200/TW125/TW225 engines - similar?

  1. #1
    Member UKJ's Avatar
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    Hi all, new on here.



    I have just taken delivery of a low mileage TW225 (in the UK). They are a bit of a rarity over here (imported from Japan).



    While 90% of the chassis parts are a direct swap for the TW125 the engine is obviously 100ccs bigger.



    What I'm wondering is whether it is effectively a bored up 125 engine - in which case gearbox/bottom end/electrical spares could be taken from a TW125 or is it a TW200 or a Serow engine?



    I can get some closeup pics if that helps. There is a TW125 forsale locally for a very good price and I'm tempted to buy it just as a spares bike incase the 225 ever needs any parts. BUT if the engine is a completely different lump then it's less useful.



    Any help would be appreciated.



    Thanks

    J



    PS. Notable features are that it is electric and kick start, 223cc (stamped on the cylinder) and 5 speed.

  2. #2
    Senior Member sinophilia's Avatar
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    A TW225, good for you! I am pretty sure the engine has much more in common with the TW200 than the 125. Then in turn, the 125cc and 200cc engines have many parts in common, but I wouldn't buy a 125 for spare parts, especially since the 225 is probably newer, I doubt you would need to replace much in the near future. Parts are not so hard to find anyway.



    Why don't you post a picture of your rarity?
    Red Max - 1996 TW200 - 14/45, 320mm toothed brake disc, X-Racing titanium exhaust, Ricochet skid plate, Mule hitch pins, large pegs, VeeRubber VRM274&275 tires

  3. #3
    Member UKJ's Avatar
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    Ahh, I was hoping the 125 would be similar - purely because there are hundreds of them over here - the tw200 was never sold in the UK.



    Sure - I'll post a few pics of mine and the engine tomorrow - see if I can match up the casings with any of the other yamaha range!



    (In terms of it going wrong. It's being used for a fairly long trip through morocco/africa (Bike had to be sub-250cc and I figured the tw225 with a bit of tweaking would be an ideal mule)- but I need to carry some basic spares with me. While I have faith in the engine - Id like to take spare electrics/gaskets/piston/rings/filters etc and would feel much more compfortable knowing I had a full spare bike sitting at home if I needed a part posted out to me if the worst happened. )

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  5. #4
    Senior Member sinophilia's Avatar
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    I think the TW225 has basically a bored up TW200 engine with an XT225 head on it... something like that! We have an expert of this kind of engines on the French forum www.bigwheels.fr, he could tell you more, even if we don't see many TW225 around...



    Africa sounds great. A guy did an African trip on his TW125 --> http://afrique.bigwheels.fr/tw_125_afrique.html (in French)
    Red Max - 1996 TW200 - 14/45, 320mm toothed brake disc, X-Racing titanium exhaust, Ricochet skid plate, Mule hitch pins, large pegs, VeeRubber VRM274&275 tires

  6. #5
    Member UKJ's Avatar
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    Yep - I read through that trip a few weeks ago. The MPG/load lugging capability of these little bikes is impressive.



    Here are some pics (not very good ones - bikes currently stored in a friends barn in the dark)



    But enough detail to compare engines I guess.
















  7. #6
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  8. #7
    Senior Member uktw125's Avatar
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    The engine is sort of a cross between a Serow and TW. The top end (except the decompressor) and crank are the same as a Serow, the gearbox is TW but what ratios I don't know, 125cc and 200cc have different gear ratios and different primary reduction and clutch.

    Any service parts should be easy to get here in the UK if you ask for Serow stuff. Also pistons,rings,cam and top end gaskets are Serow or TTR225,TTr230 parts, for bottom end gaskets TW125 will be fine.

    Carb is totally different to a Serow, it looks like a post 2000 TW125 carb on the outside but I'm sure will be jetted differently.

    Electrics i.e stator, charging, starter motor etc. should be the same as a TW125, CDI I don't know (mine runs with a 125 CDI though)



    If you ever take the carb apart I would be interested to know what the standard jetting is on a 225cc engine as I have converted a 125 to 225 and although the bike runs OK I would like to know the standard jet sizes.

  9. #8
    Member UKJ's Avatar
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    Thanks for that info - thats a relief, all should be relatively easy to get hold of unless something major goes bang.



    Sure - Ive got to do a bit of fiddling with the bike anyway so Ill get you some pics/details on the jets.



    Thanks

  10. #9
    Banned qwerty's Avatar
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    You might find a good source of info at http://www.tw-parts.com/ .




  11. #10
    Junior Member TW225UK's Avatar
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    I am in the UK also and looking for a TW200. I am interested that you have just taken delivery of a TW225. Did you import this yourself? If so, then what did you do? If you bought it from an importer, then can you give me a link?



    John

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