tortron Posted November 3, 2020 Author Share Posted November 3, 2020 No, i dont think theres any matching of these pistons to the barrels out of china (first one i gotdid the same thing you may remember) piston did move freely (i put it in the barrel beforeadding rings or anything to see if the cylinder was going to be too big after i dingle honed it) when i get a cylinder overbored il take the piston in with it, but never bothered with these 150 kits, tbh i dont think any one in the history of these kits has had them go to a machinist Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 3, 2020 Share Posted November 3, 2020 Does a gn250 drive train fit into this? Most people would give a nut to have a big block engine that bolts in- if it's that easy for you then I say you'd be silly not to. Might not be as much Internet points as modifying the 125 but you won't care once on the road and literally doing hunnits everywhere. Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 DR200 is by far superior in every way to the gn engine 1 Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 literally bolts in and has more than twice the power but nah 2 1 2 Quote Link to comment Share on other sites More sharing options...
HighLUX Posted November 3, 2020 Share Posted November 3, 2020 Buy a $500 TF125 and put the engine in the GN plz 2 Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 i would swap in a dr125 engine solely for kickstart, but otherwise no Quote Link to comment Share on other sites More sharing options...
SOHC Posted November 3, 2020 Share Posted November 3, 2020 Do you just slap a new piston in each time then hold it at red line? I think the problem is the guy on the other end of the throttle cable. Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 is there another way? im riding it around the country roads varying the load and revs. I dont think its excessive WOT *generally il warm it up on the stand once its back together till engine is at operating temp then il go ride it for 5 mins and let it cool again Then il go ride it in the country for 15 mins Do a WOT 0-100 run let it cool Ride home 15 mins Today was just a casual ride after all that. Wiseco says its ok so i dont think im too far off 4 Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 maybe im doing it wrong, but the previous 10 mins of that ride were 60-80 up and down hills, and i was backing it off to stay at 100 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 3, 2020 Share Posted November 3, 2020 Next time get cylinder sized properly to piston /double checked AND run a little 2t oil in the fuel? Quote Link to comment Share on other sites More sharing options...
SOHC Posted November 3, 2020 Share Posted November 3, 2020 1 hour ago, tortron said: maybe im doing it wrong, but the previous 10 mins of that ride were 60-80 up and down hills, and i was backing it off to stay at 100 they need over 100 kms to run in before you pull rpm like that unless you have given it extra piston to bore clearance and even then holding a stock GN125 on RPM like that is bound to fuck it Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 9 hours ago, SOHC said: holding a stock GN125 on RPM like that is bound to fuck it This simply isn't true 4 1 Quote Link to comment Share on other sites More sharing options...
SOHC Posted November 3, 2020 Share Posted November 3, 2020 I wouldn’t recommend it, needle roller big end bearings don’t like high rpm, piston rings can only travel so many FPS or it cuts the life in half. Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 Dr125s and dr200s nang just fine Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 3, 2020 Share Posted November 3, 2020 Every gn 125 ever made has been pinned at full throttle for extended periods. Every small bike has. 4 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 3, 2020 Share Posted November 3, 2020 9 hours ago, SOHC said: they need over 100 kms to run in before you pull rpm like that unless you have given it extra piston to bore clearance and even then holding a stock GN125 on RPM like that is bound to fuck it How does break in for 100km prevent these issues? Are you saying pistons and bores wear a measurable amount? Genuine question. Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 im not disagreeing that the bore should be sized to the piston an extended break in might help a piston thats only just over sized, but i feel that unless you know the point at which the piston just starts to expand and then switch it off its not going to work eh 1 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 3, 2020 Share Posted November 3, 2020 We are totally on the same page. I just trying to figure out sohc's logic Quote Link to comment Share on other sites More sharing options...
SOHC Posted November 3, 2020 Share Posted November 3, 2020 13 minutes ago, flyingbrick said: We are totally on the same page. I just trying to figure out sohc's logic The final mechineng proses happens in the 1st few hundred kms of a new engine, you must keep rpm and load down, I have seen a few times people go nuts on a new engine and damage them, read the book that comes with a new bike, Quote Link to comment Share on other sites More sharing options...
tortron Posted November 3, 2020 Author Share Posted November 3, 2020 and glaze the rings cool 3 Quote Link to comment Share on other sites More sharing options...
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