jandyb Posted July 6, 2009 Report Share Posted July 6, 2009 (edited) Hi GasGAs community. I have heard only difference between 125 and 200 is cylinder and piston. Can anyone confirm that? I`ve got a 2002 TXT Pro 200 engine with a crack in the casing lying around. Thought I should use the 200 cylinder and piston on my sons 2006 125 and use it for myself. The cylinder is not mint condition, but doesnt look too bad. What about jets? Should I use a bigger main jet? Thanks -Jan Edited July 6, 2009 by JanDyb Quote Link to comment Share on other sites More sharing options...
crasher Posted July 7, 2009 Report Share Posted July 7, 2009 hi Jan, jetting remains the same supposedly, although i put a bigger main jet in my daughters bike i think (40 pilot 115 main, 04 pro) using the standard phbl26 carb, weld on flywheel weight is also advisable as they are a bit fierce otherwise, was talking to a guy the other week who had one done at gas gas uk and he had 2 flywheel weights with a spacer for the plastic cover, as well as calming the engine down the weights also stop the bike stalling so easily, i put a slow action throttle on as well, hope this helps steve. (oh almost forgot, you also need to leave the plastic inserts out of the crankcasing, you can if you want it to be really soft put a head spacer in, i have one but didn't use it) Quote Link to comment Share on other sites More sharing options...
mikee Posted July 8, 2009 Report Share Posted July 8, 2009 Hi Jan, I've done this with my 07 125 pro and it the way forward... You get a very nice weight to power and a easy handleing bike. Jetting wise i left mine with the 125 jets and it ran ok with the delorto carb. you need to fit a lot of fly-wheel weight to get the bottom end power. (mines 850 grams) I have now fitted a keilen carb to mine to up the power some more and make it a lot more useable in the bigger trials i do. Hers a photo of my 200... Quote Link to comment Share on other sites More sharing options...
jandyb Posted July 9, 2009 Author Report Share Posted July 9, 2009 Thanks Crasher and Mikee No one of You mentions anything about if my 2002 cylinder/piston is a direct fit on the 2006 engine, so I assume this is OK then? I have not decidet what I do yet. The 06 125 (becoming 200?) is incredible light and easy to ride, but my 04 300 has an awesome power... I think I have do the 125 to 200 conversion and have a direct comparing session this weekend. -Jan Quote Link to comment Share on other sites More sharing options...
benz19 Posted July 9, 2009 Report Share Posted July 9, 2009 Hi,as long as it is a pro engine then the cylinders are interchangeable right up to current model! Benz Quote Link to comment Share on other sites More sharing options...
jandyb Posted July 9, 2009 Author Report Share Posted July 9, 2009 Hi,as long as it is a pro engine then the cylinders are interchangeable right up to current model!Benz Thanks That was what I thought. Nice to have it confirmed.. -Jan Quote Link to comment Share on other sites More sharing options...
peterb Posted July 11, 2009 Report Share Posted July 11, 2009 Hi Jan, I used to ride a 2004 200 in the Nationals here, all standard except I fitted the plastic crank case padding from the 125 motor - your bike already has this fitted, leave it in as it makes the motor more punchy, doesn't grip so well but stacks more fun to ride. (the standard 200 motor does not have the padding fitted) I experimented with a small flywheel weight but thought the bike was fine without. The 125 and 200 cylinders are interchangeable. The DellOrto jetting on the 200/125 is ok standard, the motor is very sensetive to any jetting changes, leave the D36 needle in. Move the pick up sensor clockwise (slot the sensor holes) slightly to achieve a slight static ign advance. Bye, PeterB. Quote Link to comment Share on other sites More sharing options...
mikee Posted July 14, 2009 Report Share Posted July 14, 2009 Move the pick up sensor clockwise (slot the sensor holes) slightly to achieve a slight static ign advance.Bye, PeterB. Hi peter, how far did you move the forward did you you move the pickup sensor and for what gain???? cheers mike Quote Link to comment Share on other sites More sharing options...
peterb Posted July 18, 2009 Report Share Posted July 18, 2009 Hi Mike, There is not much room to slot the holes in the pick up sensor, but enough to give a range of 1 to 3mm or adjustment, I set mine up between 1-2mm static advance to give a little more go through the rev range - biggest increase in power was fitting the crankcase padding, lose a bit of smoothness is power delivery though. Bye, PeterB. Quote Link to comment Share on other sites More sharing options...
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