ausy300pro Posted January 13, 2005 Report Share Posted January 13, 2005 can anyone help i am about to strip my sons 125 pro (03) to have a look at porting etc see if i can give it a bit more power (he is a big 14 year old), has anyone any experience of what works best, also does anyone know where to get reeds for pro, boyesen for example and do they make any noticeable difference, i was also thinking of putting some in my 05 300. thanks jeff Quote Link to comment Share on other sites More sharing options...
chris Posted January 13, 2005 Report Share Posted January 13, 2005 Put a keihin carb on and exhaust system of the 280, you will lose a bit of bottom end but it will rev to the moon. Can't see you gaining much by just changing the reeds. Quote Link to comment Share on other sites More sharing options...
spinner Posted January 14, 2005 Report Share Posted January 14, 2005 Keep us posted on your results my son also has an 03 125 pro. I have installed Boysen reeds in his bike, I don't think it makes any more power but it really makes the power smoother. I have been using Boysen reeds in all the GasGas bikes I have owned. I have them in my 02 Pro and they really help smooth out the power. I always cut the reed stops off just above the retaining screws and have never had a reed failure Quote Link to comment Share on other sites More sharing options...
chris Posted January 14, 2005 Report Share Posted January 14, 2005 I always cut the reed stops off just above the retaining screws and have never had a reed failure Do you mean you cut all the radius off the stop plate or something else? Sounds a bit dodgy to me Cheers Chris Quote Link to comment Share on other sites More sharing options...
ausy300pro Posted January 14, 2005 Author Report Share Posted January 14, 2005 thanks for replies, will keep posted on results with tuning of 125, (has anyone noticed how well alexz wiggs 125 seems to perform) ps where do i get boysens for the pro Quote Link to comment Share on other sites More sharing options...
spinner Posted January 14, 2005 Report Share Posted January 14, 2005 Most Boysen reed sets come with a new mounting plate the ones for the Pro do not. All the reed mounting plates supplied by Boysen do not have reed stops[curved metal fingers that extend up behind the reeds]. I cut off the stop fingers and smooth out the area on the mounting plate with a file. I know that I'm not the only one doing this because I have had one of the bike that the US importer had ridden and he did the same thing to it. Quote Link to comment Share on other sites More sharing options...
Guest gasgastxtpro Posted January 18, 2005 Report Share Posted January 18, 2005 I am also a big 14 year old lad, i would like more bottom end power as i have mentioned on here possibly a thousand times, i just want it to be right on with the power, like faster reaction. So thanks for keeping us posted Richard Quote Link to comment Share on other sites More sharing options...
ausy300pro Posted January 19, 2005 Author Report Share Posted January 19, 2005 will keep you posted, havent had reply from anyone yet telling me where i can get reeds from, will be 1-2 weeks before i get chance to do anything with bike. Quote Link to comment Share on other sites More sharing options...
sting32 Posted January 20, 2005 Report Share Posted January 20, 2005 (edited) Wouldnt the obvious be to get the cylinder and piston for the 200 pro be the answer? yes it would only kind of depend on the conditions of engines you are currenlty at, I mean, if it needs anything other than rings, I would go for the bigger jug&piston, I am half sure rest of the engine is zactly the same? least it was told to me they were on the txt's, and in fact that is why I bought the 10 year old (he'll be big soon) the 200 because same bike with the 280 jug& piston could easily be done cheaper than a new bike... but who knows I could win the lottery by then and we'd all have new 4strokers, NOT!!!! Edited January 20, 2005 by Sting32 Quote Link to comment Share on other sites More sharing options...
subira Posted January 20, 2005 Report Share Posted January 20, 2005 (edited) havent had reply from anyone yet telling me where i can get reeds You need to find a local Boyesen dealer I think they are distributed by Serval Marketing (AXO Sport) 01234 365365. Looks like you need the #659 reeds. I have always had to do a bit of running round to find Boyesen's, give Cusworth's in Doncaster a try, or most MX dealers (stocking AXO stuff) can order them for you. Edited January 20, 2005 by Subira Quote Link to comment Share on other sites More sharing options...
perce Posted January 20, 2005 Report Share Posted January 20, 2005 Wouldnt the obvious be to get the cylinder and piston for the 200 pro be the answer? yes it would only kind of depend on the conditions of engines you are currenlty at, I mean, if it needs anything other than rings, I would go for the bigger jug&piston, I am half sure rest of the engine is zactly the same?least it was told to me they were on the txt's, and in fact that is why I bought the 10 year old (he'll be big soon) the 200 because same bike with the 280 jug& piston could easily be done cheaper than a new bike... but who knows I could win the lottery by then and we'd all have new 4strokers, NOT!!!! The rules in the UK mean that 14 year olds have to ride a 125. Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted January 21, 2005 Report Share Posted January 21, 2005 A class is going all 125cc very soon so thats up to 17 years of age. I can't remember the ruling but think that 125cc is being phased in under UEM rules up to 18. It would be wise if thwe Americans ever want to produce the next Bernie or Lane (did I say that, excuse me) then in the States they should follow suit. Quote Link to comment Share on other sites More sharing options...
sting32 Posted January 24, 2005 Report Share Posted January 24, 2005 (edited) IMHO: This CC restriction is rediculous. & thank (your deity here) that it isnt enforced here in the US... (I removed most of my reply, since it has nothing really relavant to the OP's topic...) Edited January 24, 2005 by Sting32 Quote Link to comment Share on other sites More sharing options...
luke Posted February 11, 2005 Report Share Posted February 11, 2005 Try Haven Trialsport at barrow haven (near barton) they will be able to get you anything you want for your gasgas, and offer advice on upgrades. call them on 01469 532600 Quote Link to comment Share on other sites More sharing options...
billyt Posted February 12, 2005 Report Share Posted February 12, 2005 (edited) More power for the 125cc easy. Change the timing. Take the jug off have the base machined down approx .005>.010. Take the carb off, put a sleeve in it to take it down from 26mm to 24mm or even 22mm. Do not use Boyseen reeds as the will take away your bottom end on a 125cc big time. This is due to the reeds being predominatly made for a 250cc and the little 125cc does not have enough vacuum to open the big reed efficently. As for the removing the reed stops, DO NOT REMOVE THE REED STOPS ON ANY REEDS>>PERIOD> The pro motocrossors have their engine rebuilt every race or two therfore the engine rebuilder can check for cracks or fatique in the reeds. There by letting them remove the reed stops. Trials riders very rairly rebuild their engines so any problems with the reeds will not be noticed. The stops are there for a reason and the general guy thinks he knows better and removes them. Believe me when I tell you I have seen several trials engines were the guy removed the stops and the reeds eventualy cracked. When this happens the reed gets sucked into the engine causing very expensive damage. Trials engines do not rev high enough to take advantage of any stop removal. In all reality you will lose perfomance in a trials engine as the reed moves open further as it starts to flutter the further it opens. Cheers BillyT Edited February 12, 2005 by BillyT Quote Link to comment Share on other sites More sharing options...
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