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Post Info TOPIC: 1988 dtr


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1988 dtr
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picked up this beast (heap lol) off ebay a couple of months ago, always liked dt's but don't have the money to buy a decent one, though still 250 quid for this!


was stolen recovered but someone had already gone to the effort of q plating it which was a bonus and gone to the effort of putting new discs on it but stopped there lol was way further than i thought it was going to be lol, had a 500 mile round trip to go chuck it in the back of my car!

did the basics to get it through its mot - the fork seals, cleaned and bled the brakes, made up a set of clocks out of some bits my mate had left over from a dt he used to have and what came with it, new universal indicator relay, air filter, repaired the choped up wiring loom and got it running, put a light my mate gave me on it and indicators i had laying about off my old army bike, new ignition switch, new tankcap, stiched all the panels back together with zip ties, chain and sprockets modifyed the new pattern switch that came with it so it actually worked!, and a few other bits and bobs

here she is two days after the mot a couple of weeks ago broken down on the duel carriageway lol


turns out i'd melted the piston a bit!  I've looked into the jetting on the bike and yamaha had put a 125 main in as standard (round slide) though for the tzr same year and same carb it has a 180 main which i imagine fragged the piston when i pegged the power valve open which had never been done since 1988! Not the first time yamaha have had jetting wrong looking through some rd350 manuals i have!

luckily i had a friend i knew who had a top end with fresh piston and rebore laying around so i managed to prise that off him for 60 quid the next day and even came with a non restricted head, seemed straight forward but turned out to be a bit of a headache, got the engine together but had far too much compression and barely enough clearance on the head, so got it all apart again and had a good measure up. turns out because the piston comes slightly clear of the barrel and its a 2.5mm overbore the squish band wasn't wide enough! then having only two days to get it done as the mot was running out on the car i had to mark a 1.02mm line around the edge of the squish band and with a magnifying monicle and dremmel extend it to suite.  took most of the day working by hand with those tollerences then to get it all polished out!!! super tedious, tidyed up the porting a bit as well as if i wasn't bored enough by then!

got it done in time though, upjetted it, put a later boost bottle on it, a set of reeds that seal better, made a new bracket for the pipe because it didn't line up the same with the new top end (was 3bn now 3mb) some tidy front panels and spent the last week running it in

so far total budget is £450 including fuel to get it so not doing too bad though needs some love cosmetically!


-- Edited by fuggie on Wednesday 29th of September 2010 05:43:46 PM

-- Edited by fuggie on Monday 18th of October 2010 05:26:01 PM

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DTR Senior Member

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another dt project
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mainly just been jetting and getting some miles on it, cut the roof of the airbox off, sounds awesome and perked the bike up a bit. got bored earlier and attacked my rear caliper bracket, the holes on the edge look good but the 'dt' bit only looks decent from a meter or so away lol


Got myself a 4fu barrel as well (for the decent transfer porting) so i can get the whole centre section machined out and get a liner in there to accept dt 200 oversize pistons, got one of the tzr big heads as well but sadly yamaha attacked some of them as well with the evil restrictor band so thats useless lol

found with the standard roundslide carb, a gianelli spannie and the powervalve pegged it needed a 180 main jet so definatly far too lean as standard, probably jetted to suit the origional powervalve position!

anyhow that can be junked now as  i've got a flatslide on the way to pop in off a tdr




-- Edited by fuggie on Monday 18th of October 2010 05:09:18 PM

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RE: 1988 dtr
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saw this beast on ebay, ws goin have a bash but didnt fancy it lool

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Dtr 125 Blue 2003
Full Dep System (Soon To Be Twin)
Polished Forks
Polished Crak Cases
Polished Rear Brake Pedal
Full Wrap Guards
Yz Mud Guard

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don't blame ya, the pictures made it look good lol

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Rip it completely to bits and start from a shot blasted and painted / powdercoated frame - bet the rear suspension is shot too so I'd rebuild that whilst I was putting it together.

Get a new wiring loom as finding a second hand one thats in good condition is like looking for rocking horse shi.....

Looks like a good fun project there though mate - enjoy!

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the loom on there is pretty good now i've tidyed it up, was a massive pain even trying to figure out why yamaha wire things like they do, some of its mad.  Been a while since i've had a japanese bike!  The rear shock is actually alright, i'd picked up a spare cus i thought it would be knackered. Definatly need to make up some links to lift it up.

got the nail on the head with painting the frame, just got the car through its mot so have the chance to get it in bits again.  Can't stand the red for a start especially on the headstock cus theres such a gap at the front it looks like a hoofing red bycycle poking out lol  Was thinking black headstock area and subframe and engine loop bright orange. plus i stacked pretty hard the other night doing some late night laning and sprained my knee pretty bad so need to give that a chance to heal


-- Edited by fuggie on Tuesday 19th of October 2010 01:13:44 PM

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What do you need for it to be q plated? Did it have a frame number?

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it was stolen recovered with the frame and engine numbers removed so couldn't prove the age hense the Q plate, this was done when i got it, though obviously a 3bn model with roundslide is going to be a 1988

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Fair doos, will have to look into that, bought a stolen recovered bike that I'm fixing up atm. Frame numbers have been ground off but as far as I was aware that meant it would never go on the road again unless you could find a second hand frame which are stupidly expensive on the dt for some reason. But for £120 you can't complain, bit of off road fun if I can't get it on the road.

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shouldn't be a problem, research it online or go down your local dvla office, i imagine it would have to go through a sva test (single vehicle approval test) but i think my mate said that was only about 80 quidish. 
I insured it with ebike for the year £90 so that didn't really make any difference insurance wise, people always rattle on about not being to insure q plates but like adrian flux also specalise in them, not a problem


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I'm not too worried about it being q plated at all tbh, would just be a laugh to have it on the road, got my zxr4 for college everyday anyway. Is an SVA anymore strict than an MOT do you know. And I take it they would have to restamp it with a new frame no.? Also what I'm not sure about is how could they prove it wasn't a stolen bike (techically it was but it's stolen recovered and sold at a police auction to my local breakers)? It's not anywhere near road worthy yet anyway, still needs a rear caliper and a few other bits and pieces and electircs are non-existant lol.

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i'd google sva for more info if i was you, if you could get evidence of the sale from police auction that would be handy, or maybe a cover note from the breakers.  



-- Edited by fuggie on Thursday 21st of October 2010 05:46:01 PM

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i stripped her down earlier, came apart quite easy considering the abuse its previously had, took about 4 hours including many cups of tea, started cleaning the frame and going to finish that in the morning as i havn't got work till monday then dry it out and start getting it sprayed up, going to go with the orange and black





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Had a look at the sva tests and what's involved, thought it was like the same as an MOT, wasn't going to bother fitting lights or even an ignition barrel for that matter, was just going to fit a brake light and horn and run them off the alternator but doesn't seem I can do that for an SVA, much stricter. Just have to keep my eye out for a new frame I think. Good luck with your project though, and let me know if you fancy selling me your frame lol.

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Getting a frame with numbers and V5 at a sensible price will not be easy - might be better off looking for a complete but knackered bike ;)

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I noticed, shame as it was so easy to get a new one for my old rs125, only payed about £70 for frame and swinger as well.

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Nonce

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ive got a 2001 frame nd log book but i cant decide wether to sell

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that'd slow the project up a bit if i sold you my frame :P got it sprayed today and the engine cleaned and poped back in, found a siezed swing arm bearing which i had to drift and work it in grease for ages to get it running smooth, got some play on the link as well but pretty sure i've got one on a shock i blagged off ebay for 99p, managed to get the swingarm cleaned and primered as well though ran out of light after that - epicly boring day of cleaning bike parts

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Let us know if you're selling it mate :)

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More pics Fuggie this is sounding good :)


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DT125X 2007


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going to be waiting on some parts before any major progress now, didn't realise the tdr carb is downdraft so going to have to make up a manifold for that


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Looks good mate i really like it. Are you getting new black plastics or painting a set up a different colour?



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i got some decent front panels off ebay think it was a tenner including postage for the pair, still need to get a pair of the rear panels, and a cut down front mudguard i've had for a while, going to spray them all so will be easier to pick up the panels cheep, probably going to go flat black on the plastics - the paint doesn't crack like gloss on flexable bits, i've got a neat little single row led trials light for the rear that will sit on top of the mudguard and some minimal aluminium brackets I made up for the number plate, parts again off a old project i had, even the paint is left over from other bikes lol going to recover the seat in black

-- Edited by fuggie on Monday 25th of October 2010 05:49:38 PM

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http://www.adrenalin-pedstop.co.uk/p/Supermotard_front_mudguard_fender__universal__orange-1348.aspx

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nice project going on here, more pics please

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making progress has been a absolute headache as some of you will know from the thread where I was asking about the suspension linkage. I had a good shock but the ball joint had play in it so I ended up taking that out and going down to the local bike shop to get one but no joy as yamaha don't sell it on its own and you have to buy a new shock with one in, went to the bearing shops but its also a odd size yamaha had made up special, found a company that makes bushs and managed to size one up nicely

(bush on the left, hacksawed off bearing to the right)

also had to get a new bolt and washers and cut them to suit but all fits together better than with a origional ball joint. (cost £3.50 total though tonnes of time and about a tenner fuel going to 3 different towns to get all the parts!)

so then started on the front end so i could get the bike off the bench to properly tighten up the linkage, the head bearings drifted out of the frame fairly easily but getting the bearing off the bottom yoke was quite difficult, in the end i cut it super carefully with a angle grinder and split it so it easily came off the stem


the new one went on easy enough using the old one as a drift, i got them all greased up and tightened in place and poped on the front end as a temporary fitment, huffed it out of the shed and propped it up on a tool box so i could tighten the linkage and fiddle the rear wheel on.

the headache begins again when i started on the manifold and airbox, i'd got a later manifold because the 3bn one has the oil pipe on the carb but the tdr carb i want to fit didn't have that so i got a 3et manifold with the oil pipe spigot on it


though that manifold is higher than the origional 3bn one, i think thats because the flatside carbs are bigger than the round slides, though that then made the airbox boot lower than the inlet manifold making it impossible to fit the carb which has to angle down at 45 degrees.


Poped down to annoy the local bike shop again and crossed referenced part codes, apparantly the 3bn airbox is used from 1988 to around 1998 so i figured a later boot will fit my airbox and also line up the carb correctly so got one of them on order and fingers crossed

shes looking more like a bike again though



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DTR Senior Member

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thought i'd just have a peak in the new carb and change the main jet quick, had to drill out all the screws to get it apart, one of them days! all looks good inside though, swapped it out for a 240 for starters

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one of the best bodges i've found on the bike so far, thats the bolt that goes throughthe frame to hold on the radiator and twostroke bottle, nut went on about 2 threads on one side and a tiny jubilee clip holding on the other lol found a old bath leg with a threaded bar on it and cut that down to replace it. the best bodge had to be the powervalve cover which was a lid off a small tin siliconed onto the engine!


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Looks like you've made some progress mate - check out my ad in the for sale section as I went out to the shed today and did a massive list of all my spares

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pm'd you on a couple of those bits

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