wild foamy

nope, mines a 4 speed ( 1-N-2-3-4) but some other DTs' in the same age band as mine use a 5 speed (1-N-2-3-4-5) setup. if the engine and 'box are one unit then i guess there snot much i can do without doing a complete engine+box change, which is not worth the money or effort tbh.

nobody told me about the gearboxes, just me thinking out loud again. ive seen some MXs' with five speed boxes (first few i looked at were 5 speed) one of which was a 1992 which is in the same classification(?) as my 1990 (DT50 MX 87 - 93) unless im just off on a tangent again, that happens alot

brakes are fine and i check t'pressure regularly i think i will just have to be happy with modest modding, open the reed blocks and some fibre reeds, MAYBE a big bore kit for a bit better hill-climbing ability and thats it. oh, the gearbox, i want to find a good five-speed box so i have better selection for going uphill and the like, maybe it will give me a little more speed but who knows

well i want it to be a good bike (cheap to run, reliable, long lasting e.t.c) so i'm not too sure about going that far with modding. i don't mind having to use t'box more if needs be but on the flats i'd rather have a bit more speed. on a two-stroke like this one i doubt there is much i can do in regards to getting a good low-down power-band but i'd rather keep t'revs low to try and make t'engine last a bit longer. ive got a K&N style filter coming in t'post, will order in a few carb jets to experiment with to help t'engine breathe a bit better (plus i have a "Big One" exhaust can ) and ordered in a bigger front sprocket and slightly smaller rear one (and a new chain, may aswell change it as a set) oh, and i'm dieting, could make t'difference when going uphill

ive considered that option and should a DT80MX turn up i will probably do it, but for the moment its only a 50 so i wont be doing any serious modding. will keep a lookout for a DT/RD 80 engine though...

t'is a bit of a trek for me to get there, and you lot would smoke me on my little 50, it will only do 35mph

well im getting a spare ignition key cut tomorrow so i will ask at Timpsons and see if they can do anything

hi everyone. my DT50 ignition key doesnt fit the steering lock or the other lock under the back seat (cant hink of what its called) is there a way i can get either a steering lock, ignition switch and lock that uses the same set of keys (i.e. buy them as a whole set) or somehow get a key cut to fit the original locks? - Steve

hi everyone. the rear right-hand indiactor on my 1990 DT50MX has broken off, does anybody know where i can get a decent replacement?. its a sorta egg-shaped aftermarket one but i cant find any markings on it other than on the lens; "FACOMSA 1099 V109 50R00.4012 50R00.4012" not sure if that means anything to anybody, but i'd rather replace it than bodge a repair jobby - Steve

ah you know how it is, when youve got the cash to splash you start to get these ideas... even for just learning i would like to get a bit more speed out of it, i think it would probably be better for me to stick to small things like air filters, up a tooth on the front sprocket and maybe up a jet size to compensate for the increased airflow (prevent lean running). which leaves me plenty of cash left over to start saving for a 125

emailed the site owner and he says it comes with the head and gasket (everything together). as for things like exhausts and carbs, i was considering replacing the stock ones with DT80 parts (as i understand it, they are similar engines) but finding said parts is a different can of worms altogether... but now i think of it, by the time ive bought all the right kit i would be nearing the £300 mark before its all complete-ish, on a bike this old i doubt it would be really worth it seeing as i will be going to a 125 next year, 60cc will probably do just fine (and its £100 cheaper )

Result, polini 45mm 70cc Big bore kit £158 posted 60cc is only £57 though... but theres no replacement for displacement ive got £200 to spare on upgrades at the moment though (maybe more if i can sell some of my stuff off), so i will have to spend wisely...

what year is it?. have a look around this site for spare parts and the like BitzforBikes

there should be a small hole through the centra of the pilot jet just like in the main jet (albeit the pilot jet will be smaller) My DT50MX, for example, has a stock .84 main jet and a .54 pilot jet

wont it be expensive to get a 70cc kit over from the Netherlands?, ive thought about the CDI kit but am not sure about how benificial it would be.

hi there thanks for the advice, i cant seem to find a 70cc or 80cc big bore kit anywere, only a 60cc so that will have to do for now. am also jetting the carb and fitting a K&N style air filter to help it breathe a bit better

hi everyone. my question is, would it be possible to fit a DT80 piston and barrel into a 50 sized engine, seeing as they are similar engines (despite the size) also, anyone know where i can get a set of DT80 downpipes to help my yammy breathe a bit better? - Steve

wow, now THAT is a bike... how did you get those panels?, i assume they are all hand-made yes?. if only i could make my DT50 look like that... Hmm... the thoughts are flowing now

hi everyone. am beginning to consider a big bore kit for my Yamaha DT50MX (1990) but would like to know the facts before i do. i already have an aftermarket exhaust can (original expansion chamber though) and will be fitting a performance air filter soon. so far i can only find 60cc big bore kits but i was wanting to get at least 70cc or possibly 80cc (which i cant seem to find the kits for) so does anybody know a good UK supplier that does them?. and because of the extra power would i need a new crankshaft? (if so, where can i find them?) and also, to cope with the extra capacity im going to need to re-jet the carb which i can do no problem, but would i need a bigger carb aswell?) aint easy finding good mods for this old bike - Steve

having read-up on the dragster posts i now understand the concept of jetting and plug chopping. im familiar with fuel mixtures and the like as ive been flying i.c. powered model aircraft for a good few years and did i.c. powered monster trucks several years before, we often checked the glow plug for a healthy dark-grey head and examined the coil to see if it had gone white (indicating a lean run) and adjusted the needle-valve mixture accordingly. another way i used to tune my planes was to set the mixture slightly rich and run the engine up gradually to full power, then cut the throttle and immediately open it again, if the engine hesitated i would lean it out and try again, if the engine cut out or maxed out RPM before full throttle it was often too lean. also i used exhaust smoke as an indicator, excessive smoke would usually be caused by a rich mixture and little/no exhaust smoke meant it was too lean, do these same theories apply to petrol powered two strokes? (all mine were methanol powered two strokes) - Steve

im not sure i understand a "plug chop" i havent had this from new but the engine is the same as it was in 1990 (apart from the rebuild), will have to look up the stock size and go from there will new jetting do anything to the speed/power output of the bike and is it wasted without buying a big-bore kit to use it with? (which i dont really want to do because then it wouldnt be a 50cc)

hi again. will keep a lookout for a slightly larger sprocket and see how i go from there. what about things like air filters and carb jetting? ive found some decent air filtes for £6 a go which doesnt seem to bad if it will help the little peashooter breathe better Air Filters

hi everyone ive got a 1990 DT50 that i want to get a bit more speed out of, i don't particularly want to start moddingthe engine as it is vintage and i would like to keep it fairly stock. (am already running an upgraded exhaust can though) what gearing would be better for more speed?, im not particularly heavy (about 10st) and dont mind sacrificing a bit of acceleration for a bit more top-end speed have attached a picture, not sure why, but i like the bike thanks and regards Steve