Options, Options, Options but which ones the best?



  • How deep are your pockets?

    Avoid the Athena barrel, it ain't worth it.

    The 4FU is a good setup.

    The stock 3MB with 3MB head is good.

    I didn't/don't like/rate the Belgarda setup (3mb00p).

    Best setup I've ever had was with the stock DTR setup. 3MB barrel head with zeeltronic ignition system and a nice DEP on the stock 28mm carb.

    These engines just simply aren't rapid. So without spending thousands, I would just go with a decent pipe and stock head/barrel and grab an aftermarket ignition



  • @Calum said in Options, Options, Options but which ones the best?:

    How deep are your pockets?

    Avoid the Athena barrel, it ain't worth it.

    The 4FU is a good setup.

    The stock 3MB with 3MB head is good.

    I didn't/don't like/rate the Belgarda setup (3mb00p).

    Best setup I've ever had was with the stock DTR setup. 3MB barrel head with zeeltronic ignition system and a nice DEP on the stock 28mm carb.

    These engines just simply aren't rapid. So without spending thousands, I would just go with a decent pipe and stock head/barrel and grab an aftermarket ignition

    Pockets, well I’ve got options. Like if you told me you knew someone selling a 200 engine I’d buy it, I’d just have to make sacrifices. Engines mainly being rebuilt so I can learn how to do a rebuild and also just for good measure. Considering I already had the P setup ready to go why not make use of it or use it to fund other things?

    I’d always liked the idea of the Athena 170 even more so having it tuned. However needing to have it tuned in the first place is in issue. I have no patience and would want to and need to ride it right away which is my next issue, cost of replating it and only being allowed one overbore.

    The 4FU I’d love to mess about with, they sound like a KMX fucked a DTR and something about that excites me. On a dep pipe it’s the most bizarre sounds I’ve ever heard.
    Only issue is it needs piston (which aren’t cheap) and the head is near perfect besides one ballpoint pen tip size pit on the outside of it and the barrel has a small scratch which I’m guessing means it needs a replate. All in all running the 4FU would more then likely set me back more then the price of the Athena 170. I wonder what’d make more ponies too?

    I personally love the P barrel but mainly for its history and as a conversation piece.
    Performance gain aside all it needs is a piston so easy alternative if not could easily be sold to fund something else. Not to mention I’ve got a spare P head in really good condition that I could run on the standard barrel instead of the 3BN and end up making the same kind of gain.

    I also agree. The stock tune is such a well rounded, balanced and useable setup that manages really well with everything you throw at it. I really enjoy it and why I’m still considering it an option. It’s even outlived some of my friends 4 stroke 125’s.

    Even only a year on without huge changes I’m missing how my bike when I’d just got it. I’d love it if I could have the same performance on road with knobbly’s as I do standard without sacrificing off road capability. Putting a 120/100 rear on really destroyed most of that performance capability.
    Also getting an ignition is on my list like you’ve all said however I’m blessed enough to have a 3rm-30 cdi from factory so I’ve pushed it to the back a bit.

    They’re not rapid nope, but they’re quick enough and capable enough and that’s okay because I’m not one of them 125mph in reverse RS boys you see all over the net 😉
    I’ve rode Mx so I know better then to expect the same thing that’s why until I get my hands on a 200 or YZ motor in the distant ish future I’m really just trying to get the most out of it.

    @declan yea sure bud, think they need testing anyway all the heads have holes in the middle looks like someone shot it



  • @Stevie-Wonder 😉 well I know nothing of your top ends but if it were me I'd throw the cheapest one on have some fun and in the meantime get which ever one you want tuned sent off then swap them out,I do like the idea of a 170 too one of those tuned would be very nice



  • As said, you won't gain anything from the 3MB00P barrel, only lose power.

    Sounds like to me your mind is set on using the 3MB head on the stock barrel so just go with that.

    My advice would be to pocket the spare dosh you have, and keep an eye out for a 3XP00 engine.



  • 4FU will produce the best power curve,

    3MB P is nothing without changing the PV and Ignition timing to suit, working off a 4DL Map was a good start for a novice tune.

    Excellent midrange improvement, really needs more fuel to increase power on top though, so you should look at Carbbies to



  • so where I stand currently.

    I could buy basically new 170 kit second hand for 250, sorts my rebuild out. I also have the offer to the whole DTRE engine and the kit for 300. This is why it’s an option.

    The 4FU would be sick, but most likely it’ll need replating. https://flic.kr/p/2iXJyT
    For what I paid I’d be a lucky man if it didn’t. Also looking around and 4FU pistons aren’t cheap, the cost would work out about the same as the kit and whole engine 😞
    ![0_1588640047048_561AEB96-28A5-45A7-A5A5-0CA4CF03E8AB.jpeg](Uploading 100%) y

    Then there’s P which I recently inspected and found a rather dubious line running through the powervalve. https://flic.kr/p/2iXJEiX

    think it might have been replated at some point or some kind of modification as it looks like someone’s filed the bottom of it by its legs, think it’s the case transfer?? I’m not sure

    Also buying a Zeely is now out of Zee budget.. for now at least. I wanna see why it’s so fabulous and the difference in it between the stock 3rm-30



  • Personally I'd stick with a stock 125 set up and look for a 200cc engine.

    I'm in a similar position with my Belgarda TDR as its a bone stock 125 with Dellorto carb and original exhaust.

    My original plan was to build the bike with a 200 engine but I've been unable to source one so far and will stick with the 125 for the build whilst in lock down.

    I also own a DT200WR so dont want another 3XP engine but quite like the idea of a DT200R one as it will go straight in, look the same and the pipe will line straight up no messing. Ideally I'd like to put some 200R parts onto / into my 125 casings and retain the electric start (its also got kick start as standard).

    Next time I go to France (who knows when that might be...) I'll look for an engine but until then I'll build mine as a 125. I did also consider the Athena option but have not heard anything positive so far about them so have discounted that one.

    Dont mind spending the money for something thats decent and quite fancy the idea of having a TDR200 that looks like Yamaha made it that way - already got the alloy swingarm ready to go in 😉



  • @Nottsbiker All about that TDR250 is you ask @scrimsmustang

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  • @Calum

    Thanks but I put 200 not 250 although I do know that SM has built many Yamaha's over the years and he had a WR200 and WR250Z when I had my first DT200WR so appreciate his detailed and extensive knowledge - just need him to magic up some DT200R engines 🙂



  • I did see you put 200, but I'm not familiar with that model. Rarity may be against you, the 250's are easier had.

    You not what I wouldn't mind?

    alt text

    Yamaha SDR200! YPVS Too!



  • Sorry I wasnt being funny 🙂 just talking about making my own home built 200 like Yamaha could have built

    Yes the SDR200 - rare and expensive now and oddly with a different engine to both the 3XP and 3ET 200's - looks like its based on the old 200LC motor.



  • I don't know if they are rare. They were not sold over here which is why we don't see them. Sold in Asia. And yes it is of the LC age, late LC 1988.

    I don't know though, there is something I just like about them.



  • Yes they look good - kind of a merger between an RD125lc and a TZR125 but with a nicer looking frame

    Only ones I've seen lately are all going for £3k+ right now so definitely look like people want them to command such high prices



  • @Calum i not long ago passed up the opportunity to buy a full 89 sdr engine because I want sure how I’d go about using it. I’m gutted now. They didn’t want much either.



  • @Stevie-Wonder they claim to be a Conservative 34hp which would be nice.

    I don't think 3k is too bad especially as you see people wanting 3k for an Aprilia



  • @Calum 34 would be nice. About the same as a WR200. It’s also worth mentioning that the SDR200 bottom end doesn’t bolt in like the others and I’m not even sure top ends are interchangeable. I couldn’t find any info on here about that



  • @Stevie-Wonder Yeah I don't know much about them to be fair. But they look pretty sweet.



  • @Calum * just to update what I was saying. I just remembered who it was I was talking to and it was a couple of the TZR Belgarda boys. He says the lower mount of it is all wrong and because of the electrical start it makes the SDR motors very ideal and highly sought after by them as a direct engine swap. Unfortunately not much good for us though



  • Well I mean, I quite like the whole bike.



  • Yes only the WR / R motors are a direct swap - think the SDR has an extra rear mount but I've never seen one in the flesh for maybe 20 years now.

    £3k isn't much I know especially as they wont lose any value


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