hi took me ages to build (3 years almost sigh) but have 2k aprilia rs 250 complete front end fitted to my 3ln ( showa race forks, disks, callipers, wheel (120 tyre) and speedo set up, also have the swingarm, shock and wheel (150 tyre) of the same bike running custom made sprockets and carrier, spacers and chain, it runs a 3ln power plant bored to 290cc, JE forged pistons and rings gas flowed and ported by Jack Knight (mini specialist) lightend and balanced cams and rods with 400rrsp cylinder head (all re-valved and seated,valves from fzr 600) and carb's, carb's re-jetted and dyno'd, k&n pod air filters currently running at about 58bhp although bigger jets are needed and trying to develop a better exhaust without the exup, modified gaskets and manifold as will be running renault uno turbo when i get round to it, its fitted with k1 1000 gsxr seat unit and under tray on original 3ln sub frame with a couple of mods to brackets, billet home made catch tank and matching resiv's, 400rrsp radiator and petrol tank, all electrics are under the tank with custom battery box and loom, carbon race clip ons with hairy rs quick action throttle, Oberon bar end mirrors, carbon zzr 600 stubby can, remote igniton, on daylight mot so no lights (cant find any i like) just waiting to get paint back from house of kolor and were ready to rock and roll!!!! will be posting pics of the full build as soon as poss, i will also show all measurements, cuts and welds also i have a shed load of 3ln parts and some very tasty one of parts like polished cases and yokes, swingarm, and rims i will sort through it all photo it an post it on the site.. also have a nearly complete 3ln that i wont break £400 for the engine and you can have the rest of the bike for free <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s --> just in case your wondering how quick this bike is it runs at 58bh at 12500 and dose a 1/4 mile in low 10's but not been thrashed as still breaking in, its slow thats why im adding the turbo asap <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s -->
Best to find a complete front end and fit that. It is not that hard to do, you may or may not need spacers, if you do they are not hard to get made. These ones cost me $45 off a member on a dirt bike forum i frequent. I had a left over rather crappy 1990 YZ USD front end and Ive fitted it to a TT350 frame i had here. It had been fitted with a 550 motor, rather dodgy, ive got some 175 IT and DT stuff here so i thought i would fit one of those motors too it. I used the TT forks in my DT200, the just slide straight in and have longer travel. The TT lower bearing was a bigger ID, so i had a thin spacer made up to 'pack out' the shaft and just used a new bearing which you can buy with a seal from a bearing place. The upper YZ bearing was a bigger ID and OD but i had extra stem height so i go a spacer made to press on over the outside of the top bearing race holder, the top of it is the same dimentions as the YZ frame. If i had machined the shaft down the top clamp would not work. The forks are close to the same length as the old ones and about the same travel. Clearance to the tank is also good. That set of clamps had one of the stops chewed off it so i just put a bolt in it. I dont think the stop on the frame will be up to the job so i might have to reinforce it. Got a few other frame issues to sort out because of the kick starter. The thing you will realy have to watch on a road is the handling. By changing the forks you can alter the chassis and suspension dynamics and that could make it handle crap right through to down right dangerous tank slappers. Cheers, Bob.
<!-- s --><img src="{SMILIES_PATH}/icon_offtopic.gif" alt="" title="Off Topic" /><!-- s --> Dude, id love to know the story behind that piston kit. I had a bit of a scour on the net but couldnt find any JE pistons that were made to suit. Was it a custom fitment? Re: The forks fitment thing. Ive got a project 3LN with a ZXR250 front end fitted. Was a piece of piss. Just had to buy bearings to suit the new diameter spindle and wham bam in they went. I bought the complete front end from a wrecker for $700 which I felt was a little on the pricey side. They look effin mint though. Im SUUUUUUPER stoked on them.
