im thinking about upgrading engine size in my dt125

[mivster]

im thinking about upgrading engine size in my dt125
i was thinking about a 200-250 cc
is this possible how hard is it to do and will will i need to change anything else. also any ideas which engine to use
i want to stay with a 2 stroke engine
its not definate but if its not to hard or pricey might have a look at doing it over winter
thanks
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"I'd rather be riding my motorcycle thinking about God than sitting in church thinking about my motorcycle."

[G]

The easiest, cheapest and most sensible way would be to sell your bike and buy a 200-250cc one, I'm afraid.

You would probably have to make up new engine mountings, change various electrics, change the carb, get it setup to use the wrong airbox or change that and a few other bits.

[chris-red]

Buy a bigger bike easier, probably cheaper and you end up with a better machine.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
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[binge]

Mate of mine has just fitted all YZ250 engine and running gear into a DT125. Suspension and all!

Proper immense bike, but useless for a road bike. Rebuilds are a regular things etc.


It can be done, but if you need to ask people how to do it, then I dont think it's something you'll be capable of doing.




Ben

[G]

[Teflon-Mike]

[ClockworkJesu...]

[G]

But for all that hassle and money, they could have no doubt passed their test, presuming that's the case (which I'm not so sure about in this case.)

You are still, I'm sure, a lot less likely to get caught riding an upgraded 125 than a bike originally intended to be a 250.

[Teflon-Mike]

[G]

Yes, if you're going as far as cloning a plate.

I rode around on a CRM125 for a while, no l-plates and did use it for green laning (so often muddy, etc). Never had any problems.
Nor did my mate who had a DT125, no l-plates again.

[ClockworkJesu...]

Doesn't take much to get pulled.
My brother's got a GS500E. Full license, perfectly legal.
The other day, he got pulled because, whilst he was insured, the insurance company failed to update the MiD's records.

if they pulled my bike with no L-plates for a similar problem, they'd find I only had a provisional. No L-plates means no license (I think) and, that means trouble.

Would prefer to take my test and get a 600cc; than ride a 250cc illegally. Just me though.

[Teflon-Mike]

[G]

[P.addy]

[stevo as b4]

If you really want to get a bit more power from a DT125R engine and you have the money to spend, then rarther than an engine transplant for a difficult to fit 250cc non autolube MX motor that is really not very well suited for a road bike, then i would look at:

1, Fitting an Athena 170cc top end. This should only be done on a low mileage well looked after bottom end thats been fed decent fully synth oil, or on a brand new crank/connecting rod assembly or after the original crank has been re-built.

2, Looking for a DT200R engine, or a DT230 Lanza engine. Both are likely to fit into the std frame and use the same mountings etc, but finding either engine won't be easy or cheap. The 200R used a twin radiator set up which suggests the DT125R rad is marginal for anthing bigger than 125cc. And the DT230 Lanza engine is very rare, being fitted to a grey import only bike that was never anything like as popular as a KDX250 let alone a CRM250.

It also has an electric start, and the wiring is likely to be a pain as well as needing the correct CDI, Coil etc to get it to run and then you need to match up all the wiring for the rest of the electrics to the DTR set up. Big pain and potentially lots of expense involved too.

I do agree that if a properly fully de-restricted and in decent mechanical condition DT125R is not satisfying your needs, then it's really going to be much more economical and viable to sell it and buy a bigger trail/enduro bike that does!

Lastly i've learned the hard way over the years by wasting money a plenty on small capacity bikes/scooters trying to modify and tune them for more speed and performance. You never get a 100% satisfactory machine once you start messing around and modifying things much different to the original spec.

I always say now that the best bikes to tune are the ones that are already much faster than you need/want or can use realistically.

If you have a 150bhp superbike thats already massively quick and has much more potential that you can safely or legally use, then you can never be dissapointed if you add another 20bhp from tuning it, as your never going to use that extra power or feel it's that important to have.

Tune a 125 and expect another 20mph extra top speed and you will nearly always be dissapointed and probably totally skint too!

[dangerousdave]

[Teflon-Mike]

[mivster]

all it is ive just got a dt125 dog rough with a screwed engine so was just wondering is it worth doing so i can have a mess offroad with it
please dont jump to a conclusion i want to ride illegally as thats not my intention at all
ive got a road legal dtr125 im fully happy with and enjoy but its my baby and i dont wanna get it dirty lol
so in short with peoples opinions im guessing its not worth doing
____________________
"I'd rather be riding my motorcycle thinking about God than sitting in church thinking about my motorcycle."