Orville538

You say this correct? TRX EX300 I look at everything and ask questions to the sellers before purchasing parts,Thank you very much Slammed & Fish again!!! Fish you reminded me of someone who I grew up with and he is like my brother but from another mother,he called me Orv' for shorts all the time... Many blessings to you both and your families!!!! Pictures will be posted as soon as I can gather the parts...I'm not buying nothing Chinese either knock off's crap!!

I will post all the pictures of all the work I do to the TXR EX300,bare with me because I'm buying parts little by little,next I'm buying the 300cc head kit wiseco piston,the Hotcams stage 1 with new sprocket,already bought rocker arms waiting on delivery....

Hey Fish and Slammed I didn't notice some I should have,the piston only had 4 rings it was missing the darker color ring that does in the center of the piston you know in between the top and the 3 bottom ones (the 2 skinny ones and the wavy one that goes in the center of the skinny ones) well that one was missing for sure because I didn't take it out at all.... Now How was that even working/running? Thats obviously not good? What a hack that guy!!!!

Yeah Im just gonna do this...I really don't care for the BBK this atv my son is gonna ride it anyway,I'm building me a 01 Raptor660r with all Hotcams Top end stuff,Hinson clutch basket and pressure plate,gytr clutch,and so on.... but back to the Honda subject I'll just get this 300cc kit,I ordered the rocker arms last night "Honda brand" not cheap crap...but I want to THANK YOU SLAMMED & FISH for you dedicated help...you guys are awesome!!!! All this is for my boy.... Isee that any 330cc kit cases need machining....

This are oem replacement supposedly no cases dont need machining or I saw a honda brand jug made into a 330cc jug for $120-$130 o e of the 2 and I'm gonna need those rockers and camshaft as well

Interesting you're right,i took measurements from bottom and today from the top 2 different measurements and I knew the rockers were no good as soon as I saw them and felt them

Look at this I think is this an OEM cylinder head....this is the hack job someone did....

Hey Slammed This is the bottom sleeve grinded down more piston pictures and the Hey Slammed here the pictures of the grinded down sleeve with measurements some are a millimeter thicker or thinner,piston is 90.0mm cylinder 90.5 mm head gasket 80.0mm....also some pictures of the camshaft rocker arms which feel sharp as a knife on the edges I don't think they are good anymore and the little screws for adjustment in between the valve and the bolt....

If you can move the thread go ahead.... I just don't want to loose the help please....

Hey Slammed I forgot a major detail this honda would tick tick tick loud....and this came from a trade I did...long story short the guy who sold this to the guy I made the trade with told me that the guy told him "I just rebuilt this engine and is ready to rip" and the ticking on it is normal on this Honda's!!!! All this is coming from the original owner.... anyway when I heard it and saw the grey gaske goo coming from the valve cover and missing bolts and bolts loose I knew right away that it was a hack job....and the cherry on the top was I noticed the bottom of the sleeve shaved down all around.... and the rod has alot of play if I wiggled it side to side....I will post pictures when I come home later on,I'm at work now.... I do new construction homes in Fl.

No biggie slammed,I appreciate the help also Fish I want to thank you for your time and info as well,I don't like wasting no ones time because time is valuable you cant give time back to no one,BTW as yoy guys know I'm new to this forum!!!! I have some knowledge about atvs but not to your level,with that said I researched Wiseco they have a 79.50 mm 8 8:1 but is for 350cc rancher? and a 78.50mm 8 8:1

I got this Honda TXR EX300 but I suspect it has a big bore that someone made fit without machining the cases...apparently the person grinded down the cylinder bottom sleeve and fit the cylinder head somehow,I will post pictures of the sleeve tomorrow possibly,for now I have this and need help whti the size of piston needed,looks like the camshaft is a bit rough to...maybe? Piston skirt has this scratches...piston is Niche brand like cylinder head sold @ Ebay or Amazon