Honda 250r Tuning problems need help??

[TRX-RACING]

Ok, to make a long story short i got screwed by buying a 250r off ebay. Origionally the bike had a stock bore of 66mm but had a 38mm carb on it (stock 34mm) which was entirely to big, the bike didnt run right at all. So i got a new 35mm for it and it ran lean to long and blew up.............
So now i got it all back together it has a CT Racing full pipe on it, Stage 2 Pro National port and polish and 76mm wiseco piston. Im having big tuning problems.
1 to start off with, air/fuel mixture 1.5 turns out. 165 main needle all the way up so it would run rich simptoms were wet plug no power at all.
2-165 main 2nd notch from bottom, plug dry black no power all around.
3-160 main 2nd notch from bottom, plug brown black around the outsides, no low end, mid breaking up and top end breaking up. 4-160 main, needle in middle same simptoms as step 3
5-155 main Top excellent, mid excellent, and low great slugish take off. then i checked the plug and dont even want to talk about it, but melted the end off
Crank seals are brand new dont leak* The bike ran good as i went lower aka leaner WHY!!!! Step 5 road around once didnt take long!!!!! Could be out of time?* im begging you people ive tuned alot of 4 stokes ive never seen anything like it???

[all250r]

Try to calm down a little. 2strokes are pretty simple machines and cheaper. If you get the basics covered you should have a pretty good place to start fine tuning. Your description is a little scattered I think. The best way to get yourself into trouble is to have a problem and then change a bunch of things at once to fix it. Are you saying that you have a 76mm piston now and a 35mm carb..?

38mm carbs on a 250cc engine very common, especially with a ported cylinder. Stock TRX's are very mild and very reliable. What all did you change and how is it that you think you got screwed exactly?

[TRX-RACING]

Originally Posted by all250r

Try to calm down a little. 2strokes are pretty simple machines and cheaper. If you get the basics covered you should have a pretty good place to start fine tuning. Your description is a little scattered I think. The best way to get yourself into trouble is to have a problem and then change a bunch of things at once to fix it. Are you saying that you have a 76mm piston now and a 35mm carb..?

38mm carbs on a 250cc engine very common, especially with a ported cylinder. Stock TRX's are very mild and very reliable. What all did you change and how is it that you think you got screwed exactly?

Yes it has a 76mm piston and a 35mm carb. I purchased the bike off ebay out of state and when i got there it wouldnt open up all the way. it was about 20 degrees outside and i figured it was cold and i was to and loaded it up and came home. It had a 38mm carb with a 180 main that is too big for a stock motor it was to rich soaking the plug. thats when i got the 35mm airstriker and i still couldnt get it tuned and it went lean and blew up. Then while the motor was out i figured i should go through it. I had it ported, bored, new rod, crank, seals. and now im here with the same problem again? i just dont see why its to rich no power or lean with tons. What do you think about reeds. Mine are stock see no light through them?
Thanks for the reply, Just since i bought this bike ive never rode it just put money in it

[pimpt250r]

unless you had it resleeved you dont have a 76mm piston ,, I think that puts you around 300cc and a stock jug wont support that,

what is your slow jet ,
there is more to the jetting than just 1 jet ,you have the air screw to

most companies that offer advice on jetting say to run the clip in the 3rd setting

[TRX-RACING]

Originally Posted by pimpt250r

unless you had it resleeved you dont have a 76mm piston ,, I think that puts you around 300cc and a stock jug wont support that,

what is your slow jet ,
there is more to the jetting than just 1 jet ,you have the air screw to

most companies that offer advice on jetting say to run the clip in the 3rd setting

It has a 52 pilot air screw is 1.5 turns out and the needle works from 1/4 to 3/4 throttle. So that means you are aspost to move it during tuning it, rule of thumb move more that 2 spaces change jet!! And stock is 66mm you can go .010 bigger. All i want to know is why its either lean halls ass then blows up or to rich coal black plug. When i get the plug looking great it wont clean out slight mid, not top. Could it be my reeds?

[flotek]

35 is too smal l for ported 250r ... imho why would you go down in carb size ? and it sounds like your jetting should be around 160 and 55 pilot but maybe theres more ot the story might be elcetrical problems is the plug new is the gas and premix fresh whats the compression is the filter clean and free flowing

[O.J. Simpson]

just a guess, but have you checked your stator? I had an issue with my r and had almost the same problem. Couldn't get the carb jetted, it was either to rich or to lean. Turned out the stator was bad.

[TRX-RACING]

I will look into the stator.....I have a 38mm carb ill put on it and see what happens, The filter is good and gas was just remixed and changed to 40:1
Thanks guys

[Bad Ass Honda 250r]

do you know anything about jeting??? because i think you could get a stock 250r to run with a 38 carb on it...

[TRX-RACING]

Ok so lets say ive had had the same problem with both carbs. now were we looking at the stator or reeds?