2poke Posted November 9, 2011 Report Share Posted November 9, 2011 hi fellas new here so go easy lol heres my rs 125 recently fully restored specs when restored were slight port work 34mm dellorto flatslide raceing carb flat top ktm exc 125 piston vhm flat top head full arrow exhaust system 415 pitch raceing chain and sprokets vforce 3 reedblock and reeds fully adjustable sachs boge shock brembo front disc from a rsv mille here it is on the dyno (i have a friend thats just opened a dyno place so its accessable to me any time) made 33.67 HP and 15.98 FT pounds of torque after restoreng it and having it running full power i decided to push the boundries and find out exactly what kind of hp and tourqe is possible from one of these bikes, as theres a lot of crap / misleading info around about them. i wanted to keep the barrel bore size the same as it is stock (54mm) bolting a BBK on is kinda cheating in my book so first on the list was to call a good 2 stroke tuner after being advised and hearing lots of good feedback i decided to go with mr mick abbey after a good old chat i decided to go with a cylinder tune (port work) and a custom fabbed pipe these are curently in the post and will be with me by friday some pics of the cylinder and the pipe i have a cuple of questions as im hopeing theres a cuple of 2 stroke gurus on here i want to modify the air box to let more air in now should i mod the airbox (if so how?) or go with a open filter such as a cone filter ? the reason i ask is i dont see many 2 T race bikes with cones on also im using the stock CDI with the environment dip at 5/6k removed would i benifit from the likes of a zeeltronic programmable ignition ? i know its only a 2T 125 but i want to see what i can get out of it before i move on to the likes of a rd 350 or rgv 250 ill keep this thread updated when i receive the stuff from the tuners Link to comment Share on other sites More sharing options...
rgvbaz Posted November 9, 2011 Report Share Posted November 9, 2011 Looks like a great project. Look forward to seeing the future results. I would love another 125 myself. Hopw it all goes well. Dave Link to comment Share on other sites More sharing options...
2poke Posted November 9, 2011 Author Report Share Posted November 9, 2011 Looks like a great project. Look forward to seeing the future results. I would love another 125 myself. Hopw it all goes well. Dave thanks mate its been a cracking little bike to learn basic mechanics on soon as im done with the hp chase ill sell it and look to get an rz 350 or rgv im hooked on 2 stokes now ill keep the thread updated for all those interested needless to say ittl be going back on the dyno once the pipe and cylinders back Link to comment Share on other sites More sharing options...
2T Institue Posted November 9, 2011 Report Share Posted November 9, 2011 Removing the snorkel will cost HP and over rev, let alone the whole airbox. The Zeeltronic will be the best investment you make. Do you live anywhere near Santa Pod? What sort of compression ratio is the bike running? Link to comment Share on other sites More sharing options...
2poke Posted November 9, 2011 Author Report Share Posted November 9, 2011 Removing the snorkel will cost HP and over rev, let alone the whole airbox. The Zeeltronic will be the best investment you make. Do you live anywhere near Santa Pod? What sort of compression ratio is the bike running? the squish is set at 1.1 mm the head volume is 11.60cc with the top of the piston at BDC level with the bottom of the exhaust port the exhaust port timing is remaining stock with all other ports worked it pumps out 160 psi compression when warm ive never actually measured the compression ratio im thinking of doing it tho when i refit the cylinder is the easiest method the syringe and oil method or is there another way ? this is the same setup as the above run except with the airbox completly stock (with a smaller main jet) the other run (above) was with a cone filter Link to comment Share on other sites More sharing options...
2poke Posted November 9, 2011 Author Report Share Posted November 9, 2011 comparison of airbox and open filter Link to comment Share on other sites More sharing options...
Devon Posted November 9, 2011 Report Share Posted November 9, 2011 Use a compression tester to test the compression, it just screws into where the spark plug goes and then it gives you a reading. I dont own one myself as I borrowed one from my neighbour Link to comment Share on other sites More sharing options...
CRMotard Posted November 9, 2011 Report Share Posted November 9, 2011 Removing the snorkel will cost HP and over rev, let alone the whole airbox. The Zeeltronic will be the best investment you make. Do you live anywhere near Santa Pod? What sort of compression ratio is the bike running? +1 No point having a ported barrel and performance pipe if you cant tune the PV and iginition to match you could even go bigger with the carb once you've got the rest set up... Im not sure what your 34mm carb has, but the PWK38 from an RM250 has TPS sensor which is very handy to have with a programmable ignition Some say the 38 may be too big, but it cant be too bad as the 125mx bikes run them. Link to comment Share on other sites More sharing options...
crumpy Posted November 10, 2011 Report Share Posted November 10, 2011 This is awesome. I miss my rs so much. Good luck Link to comment Share on other sites More sharing options...
rgvbaz Posted November 10, 2011 Report Share Posted November 10, 2011 I know Darrell Taylor (50cctuning) did quite alot of work on this type of engine when he tuned them for the 1 make RS series a few years ago. I think he got quite a bit more power out of them. Dave Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 +1 No point having a ported barrel and performance pipe if you cant tune the PV and iginition to match you could even go bigger with the carb once you've got the rest set up... Im not sure what your 34mm carb has, but the PWK38 from an RM250 has TPS sensor which is very handy to have with a programmable ignition Some say the 38 may be too big, but it cant be too bad as the 125mx bikes run them. hi i have a 39 pwk sitting in the garage its been bored out to 41 mm i dont trust it tho as ive holed a piston in the past with it fitted i may get it out clean and have a look at fitting and jetting it tho the vhsb 34 mm flatslide is the raceing flatslide they use on the aprilia raceing bikes theres no tps no powerjet just a flatslide defo looking to get a zeeltronic for this bike how would i go about tuning the zeeltronic would you suggest running the preintalled maps or makeing one from scratch ? how would you go about it ? advance the low rpm and retard the highr rpm ? i have no clue when it comes to ignition maps ive downloaded the graham bell book of 2 stroke tuning ill give that a good read i think Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 Use a compression tester to test the compression, it just screws into where the spark plug goes and then it gives you a reading. I dont own one myself as I borrowed one from my neighbour it pumps out 160 psi when warm I know Darrell Taylor (50cctuning) did quite alot of work on this type of engine when he tuned them for the 1 make RS series a few years ago. I think he got quite a bit more power out of them. Dave yeah 40 hp he got from what ive seen im aiming for around that if i can as said ittl be going back on the dyno with the new pipe and port work and ill take things from there once ive got a new baseline run done Link to comment Share on other sites More sharing options...
wesifume Posted November 10, 2011 Report Share Posted November 10, 2011 Why so Serious???? anyway, i'm watching this thread as i have an rs to rebuild myself. Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 LOL ^ any way been waiting for the posty since 9am heres the new cylinder rework and the new pipe off to rebuild the engine catch up this thread later on Link to comment Share on other sites More sharing options...
2T Institue Posted November 10, 2011 Report Share Posted November 10, 2011 Looks as though the Arrow pipe swaps mid for top end, the RS is a difficult one to get useable HP out of, I think the case volume is too small to get serious HP from, that and you will need to have peak power at 12,500 not 10,500 with a TYGA pipe. But the TYGA pipe makes it joy to ride on the road. With the Zeeltronic it comes with 1 or 2 pre installed maps, best is you go to the dyno and play around every engine is different. Link to comment Share on other sites More sharing options...
si.likes.guiness Posted November 10, 2011 Report Share Posted November 10, 2011 you cant compare a restricted nsr to prilla 125 Link to comment Share on other sites More sharing options...
wazrs257 Posted November 10, 2011 Report Share Posted November 10, 2011 Welcome mate, bike looks great. Is that the 1st Abbey pipe that lost power, or a new one? Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 Welcome mate, bike looks great. Is that the 1st Abbey pipe that lost power, or a new one? thats a new one, the first one made hit 32 hp and was lower then the arrow exhaust ive just been out on this after fitting the cylinder and zaust to my bike today all i can say is WOW how and why its produceing power all the way to 14000 rpm is beyond me the power seems to come on song at 10000rpm and dosnt drop at all till 14 000 rpm ive slapped a big main jet in there till tuesday when its goin back on my mates dyno all i can say is MR ABBEY has worked his magic Link to comment Share on other sites More sharing options...
wazrs257 Posted November 10, 2011 Report Share Posted November 10, 2011 Lookin forward to seeing the results Link to comment Share on other sites More sharing options...
rg_gammaman Posted November 10, 2011 Report Share Posted November 10, 2011 14,000rpm with a stock CDI and an unbalanced crank....,,,interesting:) Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 14,000rpm with a stock CDI and an unbalanced crank....,,,interesting:) its an early sp cdi and sp rave contoller (dont know wether that has anything to do with it?) ill get a vid of the bike rideing with the cam on the rpm dial tommorow crank been balanced and trued and recently rebuilt by paul at pjme Link to comment Share on other sites More sharing options...
rg_gammaman Posted November 10, 2011 Report Share Posted November 10, 2011 That'd be interesting as you said you were running stock exhaust timing, if it's making Peak power at 14,000 I'd of thought the pipe was about 150mm too short! Never seen an RS rev that high before. Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 That'd be interesting as you said you were running stock exhaust timing, if it's making Peak power at 14,000 I'd of thought the pipe was about 150mm too short! Never seen an RS rev that high before. when i got the barrel back today from the extra porting work that had been done it looks as if the exhaust port has been worked so i dont think its stock timeing any more next to the arrow chamber the abbey fabbed pipe is a lot shorter then the arrow also Link to comment Share on other sites More sharing options...
rg_gammaman Posted November 10, 2011 Report Share Posted November 10, 2011 To be honest the Arrow pipes are pretty good on the RS. In fact they actually work better with the longer manifold! Link to comment Share on other sites More sharing options...
2poke Posted November 10, 2011 Author Report Share Posted November 10, 2011 To be honest the Arrow pipes are pretty good on the RS. In fact they actually work better with the longer manifold! yeah i always used mine with the longer manifold seemed to run better i was told the shorter one would give more tourqe higher up the rev range then the longer one after trying the 2 i found the longer mani the best as you say Link to comment Share on other sites More sharing options...
rgvbaz Posted November 11, 2011 Report Share Posted November 11, 2011 Get some spacers made up for the dyno test, it always amazes me how much differnce 5mm makes on the header. I also usually make a trombone style belly (dwell) section so that can be dialed in as well. Look forward to seeing the results. Dave. Link to comment Share on other sites More sharing options...
2Smoke Posted November 11, 2011 Report Share Posted November 11, 2011 Good stuff! Mick is a top guy too, can talk the arse off a donkey mind. Made me some pipes for my lc many, many years back. Excellent project! Link to comment Share on other sites More sharing options...
2poke Posted November 11, 2011 Author Report Share Posted November 11, 2011 Good stuff! Mick is a top guy too, can talk the arse off a donkey mind. Made me some pipes for my lc many, many years back. Excellent project! not arf ! Link to comment Share on other sites More sharing options...
2poke Posted November 11, 2011 Author Report Share Posted November 11, 2011 rs sound clip clicky Link to comment Share on other sites More sharing options...
2poke Posted November 12, 2011 Author Report Share Posted November 12, 2011 dynos off for a few weeks folks big end bearings just let go it was due a crank build to be fair i just ignored it Link to comment Share on other sites More sharing options...
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