mik60ish Posted September 25, 2008 Report Share Posted September 25, 2008 My granddaughter has a 2004 TXT pro 125 which is flat as fart is there a solution ie jetting or Boyesen reeds to enable her to get more bottom end power, we have had the bike about 6 months and she has just started so its ideal to learn on! but would be nice to have a bit more instant power to get the front wheel up, I realise it might be a bit tired after 4 years. Quote Link to comment Share on other sites More sharing options...
jandyb Posted September 25, 2008 Report Share Posted September 25, 2008 My granddaughter has a 2004 TXT pro 125 which is flat as fart is there a solution ie jetting or Boyesen reeds to enable her to get more bottom end power, we have had the bike about 6 months and she has just started so its ideal to learn on! but would be nice to have a bit more instant power to get the front wheel up, I realise it might be a bit tired after 4 years. Hi A 125 should be more than enough without having to pep it up. Even my sons 2002 125 pro was carrying my 90 kg quite well.. If it really is "flat as a fart" I would think that there is something wrong. I suppose You have cleaned the air filter and carburator? Checked the existing reeds? Changed the plug? Cleaned the filter in the fuel tap? Every connection between air filter, carb, reedhouse, cylinder is tight? Is the exhaust not clogged? If this doesnt help there can be other issues like the cylinder, piston or rings (or all). Hmm... faulty crank seals? Missing something now?? -Jan Quote Link to comment Share on other sites More sharing options...
spenser Posted September 25, 2008 Report Share Posted September 25, 2008 You may consider fitting a 200 cc (actually a 175cc) cylinder, the 125 doesn't develop a lot of torque so you need to use revs to get into the power. Spencer Quote Link to comment Share on other sites More sharing options...
jse Posted September 25, 2008 Report Share Posted September 25, 2008 A 125 should be more than enough without having to pep it up. Even my sons 2002 125 pro was carrying my 90 kg quite well..If it really is "flat as a fart" I would think that there is something wrong. I suppose You have cleaned the air filter and carburator? Checked the existing reeds? Changed the plug? Cleaned the filter in the fuel tap? Every connection between air filter, carb, reedhouse, cylinder is tight? Is the exhaust not clogged? If this doesnt help there can be other issues like the cylinder, piston or rings (or all). Hmm... faulty crank seals? Missing something now?? -Jan I would tend to agree with Jan, I think there's something that's causing the lack of power. I built a GG 125 for one of the U.S. riders at the 05' U.S. World Round and it was not much off stock to work well. Danny Oliveras showed me the few parts that he brought with him from Spain to install on a stock bike and they were not anything unusual and he was world 125 Trials champion. I would start by doing a complete engine evaluation and adjustment to eliminate causal factors. What jetting are you using? Jon Quote Link to comment Share on other sites More sharing options...
mik60ish Posted September 25, 2008 Author Report Share Posted September 25, 2008 I would start by doing a complete engine evaluation and adjustment to eliminate causal factors. What jetting are you using?Jon I tried my carb of my 05 TXT pro 250 it didn't make much difference! Would a simple compression test do, to see if the engine needs attention? Cheers Mike Quote Link to comment Share on other sites More sharing options...
jandyb Posted September 25, 2008 Report Share Posted September 25, 2008 You may consider fitting a 200 cc (actually a 175cc) cylinder, the 125 doesn't develop a lot of torque so you need to use revs to get into the power.Spencer That is a wery elegant way of "pepping" a 125. It is a direct swap. Just need a cylinder and piston. In this case I still mean that it should not be nessesary, but for an old (heavy) guy like me the 200 (175)cc is a perfect toy. More than once have I wondered why I changed my old 200 to the beast of a 300 I have now -Jan Quote Link to comment Share on other sites More sharing options...
bikespace Posted September 25, 2008 Report Share Posted September 25, 2008 You may consider fitting a 200 cc (actually a 175cc) cylinder, the 125 doesn't develop a lot of torque so you need to use revs to get into the power.Spencer It's an idea, but don't let it make you think the 125 won't have the power if it's running right. The 125 is hellish powerful when you wind it up. I actually think I ride slightly better on one except on stuff I need some torque to get me out of trouble, and I'm about 125Kg. You're a bit far away for me to suggest someone to have a look at it. Quote Link to comment Share on other sites More sharing options...
dabomb Posted September 25, 2008 Report Share Posted September 25, 2008 (edited) It's an idea, but don't let it make you think the 125 won't have the power if it's running right.The 125 is hellish powerful when you wind it up. I actually think I ride slightly better on one except on stuff I need some torque to get me out of trouble, and I'm about 125Kg. You're a bit far away for me to suggest someone to have a look at it. I agree,my son has an 03 which is in top condition,its fairly flat on low revs but when you give it a hand full its mean! Edited September 25, 2008 by dabomb Quote Link to comment Share on other sites More sharing options...
no1 Posted September 25, 2008 Report Share Posted September 25, 2008 (edited) Renew the mid box and rear pipe with an 03, 05 or later the 04 exhaust on the 125,200s are no crap then see how it runs Edited September 25, 2008 by no1 Quote Link to comment Share on other sites More sharing options...
spenser Posted September 26, 2008 Report Share Posted September 26, 2008 The engines on the 125cc Gassers are not subtle, that is why I suggested the upgrade to the larger bore. As others have noted, the response at higher rpm is fierce on the 125. You may also consider checking out the thread on this forum on upgrades to 225cc kit. We put the kit on a 2007 125 racing for my spouse-like partner girlfriend and it is a beautiful machine. Spencer Quote Link to comment Share on other sites More sharing options...
jse Posted September 26, 2008 Report Share Posted September 26, 2008 The engines on the 125cc Gassers are not subtle, that is why I suggested the upgrade to the larger bore. As others have noted, the response at higher rpm is fierce on the 125. You may also consider checking out the thread on this forum on upgrades to 225cc kit. We put the kit on a 2007 125 racing for my spouse-like partner girlfriend and it is a beautiful machine.Spencer Spencer, is that the S-3 kit http://www.trialspartsusa.com/racing-parts.html ? That sounds like my kind of hybrid. Jon Quote Link to comment Share on other sites More sharing options...
peterb Posted September 27, 2008 Report Share Posted September 27, 2008 Hi Mike, Would be good to have a look at it the next time we are at the same venue, you never mentioned that it wasn't going well at the last trial. On the 125 motor, there should be plastic crankcase padding installed under the cylinder, in the mouth of the crankcase. Have a look under the barrel, you can leave the head on, it is a white plastic moulded piece. Bye, PeterB. Quote Link to comment Share on other sites More sharing options...
spenser Posted September 27, 2008 Report Share Posted September 27, 2008 Jon, that is the kit. We got the first one to hit North America and managed to con it out of Adrian. Lots of fun. Spencer Quote Link to comment Share on other sites More sharing options...
jse Posted September 28, 2008 Report Share Posted September 28, 2008 Jon, that is the kit. We got the first one to hit North America and managed to con it out of Adrian. Lots of fun.Spencer Neat! I know S3 makes a lot of aftermarket parts, but I understand they are the company, under contract, that makes all the stock GasGas cylinders for all the Trials bikes. Jon Quote Link to comment Share on other sites More sharing options...
mik60ish Posted September 29, 2008 Author Report Share Posted September 29, 2008 Thanks or your replies guys we tried a (new) 07 125cc at the weekend, obviously it more responsive but it had the same basic characteristics as our 125 flat at low revs but flies when revved, so decided if it aint broke don't fix it! Quote Link to comment Share on other sites More sharing options...
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