frazer807 Posted May 22, 2009 Share Posted May 22, 2009 hi does any one know how to deristrict my Yamaha dt 125 it is a 2000 model it seems to run out of revs at about 70mph also does any one know of a cheap dep race pipe for my bike as well am trying to find one but have had no luck finding one that is under 200 pounds Link to comment Share on other sites More sharing options...
AndyDtr08 Posted May 23, 2009 Share Posted May 23, 2009 hi does any one know how to deristrict my Yamaha dt 125 it is a 2000 model it seems to run out of revs at about 70mph also does any one know of a cheap dep race pipe for my bike as well am trying to find one but have had no luck finding one that is under 200 pounds http://www.dtr125.net/tuningf.htm this is the best page ive found regarding the de restricting of Dtr125's, although id ignore some of the more drastic measures of cutting bits off rubber that go into the reed block and stuff like that unless your desperate for that extra 1mph! Powervalve is the most effective tbh. Link to comment Share on other sites More sharing options...
JimR Posted May 23, 2009 Share Posted May 23, 2009 http://www.dtr125.net/tuningf.htm this is the best page ive found regarding the de restricting of Dtr125's, although id ignore some of the more drastic measures of cutting bits off rubber that go into the reed block and stuff like that unless your desperate for that extra 1mph! Powervalve is the most effective tbh. Thats not drastic .. I've had alsorts of tuning methods ... like 10 base gaskits fitted, ½ the piston cut away, exhaust/transfer ports attacked with a cutting stone etc , reed valve stops bent so much the reed breaks & ends up distroying the bore & piston .... the list goes on !!! but as you say having the PV system working along with an exhaust of the correct dimensions will do most 125 owners & there is no need to go 'over the odds' for little gain Regards Jim Link to comment Share on other sites More sharing options...
AndyDtr08 Posted May 24, 2009 Share Posted May 24, 2009 Thats not drastic .. I've had alsorts of tuning methods ... like 10 base gaskits fitted, ½ the piston cut away, exhaust/transfer ports attacked with a cutting stone etc , reed valve stops bent so much the reed breaks & ends up distroying the bore & piston .... the list goes on !!! but as you say having the PV system working along with an exhaust of the correct dimensions will do most 125 owners & there is no need to go 'over the odds' for little gain Regards Jim Well yeahm obviously it depends what your comparing it to but thats like saying killing your enemy isnt drastic in comparison to killing him, his entire family and anyone he's ever met. I just mean that if you start cutting off bits of rubber and modifying parts to the extent that a new part would need to be bought in order to restore the bike to its previous state then your reducing the price you can eventually sell it for. Personally i like to keep my bike as original as i can, so when i go to sell it i can keep down the depreciation (sp). Whats 10 base gaskets do? Link to comment Share on other sites More sharing options...
frazer807 Posted May 25, 2009 Author Share Posted May 25, 2009 Thats not drastic .. I've had alsorts of tuning methods ... like 10 base gaskits fitted, ½ the piston cut away, exhaust/transfer ports attacked with a cutting stone etc , reed valve stops bent so much the reed breaks & ends up distroying the bore & piston half of these i have never heard of to do to your bike whats a 10 gaskit or the exhaust/transfer ports attecked with a cutting stone Link to comment Share on other sites More sharing options...
JimR Posted May 26, 2009 Share Posted May 26, 2009 Thats not drastic .. I've had alsorts of tuning methods ... like 10 base gaskits fitted, ½ the piston cut away, exhaust/transfer ports attacked with a cutting stone etc , reed valve stops bent so much the reed breaks & ends up distroying the bore & piston half of these i have never heard of to do to your bike whats a 10 gaskit or the exhaust/transfer ports attecked with a cutting stone As a mechanic in the 70's & 80's these where some poor attempts at tunning Adding 10 cylinder base gaskits (the theory is) will alter the port timing on a 2 stroke motor ! Opening the 2 windows in the back of the piston (theroy is) this will allow better gas flow into the primary compression area (married to bent reed stops). Attacking the transfer/exhaust ports with a stone will also alter the port timming (there was a book called tuning for speed which gave info on how to tune early motors) this was looked at & acted on with bad results. I was adding the pitfalls of trying to tune the motor with little knowledge and the expense that could be incured by following such practices. A link to the book http://www.webbikeworld.com/books/tuning-for-speed.htm Regards Jim Link to comment Share on other sites More sharing options...
JimR Posted May 26, 2009 Share Posted May 26, 2009 Well yeahm obviously it depends what your comparing it to but thats like saying killing your enemy isnt drastic in comparison to killing him, his entire family and anyone he's ever met. I just mean that if you start cutting off bits of rubber and modifying parts to the extent that a new part would need to be bought in order to restore the bike to its previous state then your reducing the price you can eventually sell it for. Personally i like to keep my bike as original as i can, so when i go to sell it i can keep down the depreciation (sp). Whats 10 base gaskets do? Hi Andy read the other post. With your bike I would guess just alterations to the PV system is all you need to under take Regards Jim Link to comment Share on other sites More sharing options...
frazer807 Posted May 26, 2009 Author Share Posted May 26, 2009 o ok thnx well i dout i will try any of those lol i wnt my bike not to blow up lol Link to comment Share on other sites More sharing options...
JimR Posted May 26, 2009 Share Posted May 26, 2009 o ok thnx well i dout i will try any of those lol i wnt my bike not to blow up lol just trying to help Link to comment Share on other sites More sharing options...
frazer807 Posted May 28, 2009 Author Share Posted May 28, 2009 just trying to help ok well thank very much for trying to help Link to comment Share on other sites More sharing options...
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