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DT125R Forum -> Tuning -> Top end F******
Post Info TOPIC: Top end F******
1990dtr (aka THIEF)


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Top end F******
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james
tripr


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aww m8 is that your fresh top end too ,

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1990dtr (aka THIEF)


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yeah on the new 03 engine would run for half hour then wouldnt run at all opend the head up and found this lol barrel needs a re sleave due to the chip outta the wall so im having my old barrel bored out to 58.90mm from standard should have it running sweet by the end of next week

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james
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Shame m8 its always good to have spare bits aint it im always up an runnin again in a few hours..
same sorta thing just happend to me on a new rebore, i know how ya feel.
Think mine was my own div head fault tho either old piston pieces outta my zaust got sucked into the chamber or i ran it to lean using the middle needle clip in the carb no damage to my cylinder luckily but my heads gone a bit like yours

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1990dtr (aka THIEF)


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yeaaah i know man bad times mine took a chip outta the sleave so im so glad i kept the other head haaha

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james
NORFE


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yeah mate seen em



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satelliteone


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ohh dear, running weak on da mix. the edges of the doughnut in the head plus the piston shows grey, and some detonation too. Thats got pretty hot.

u need to do plug chops on a rebuild chap. i would say upjet! what ya running a 240 main jet on the mikuni? or is it the 210 jet mikuni.

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1990dtr (aka THIEF)


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i bought it like this bud lol not self harm haaaa pulg chop whats that ?? and im running 210 jet currently looking for upgrade

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james
NORFE


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1990dtr wrote:

i bought it like this bud lol not self harm haaaa pulg chop whats that ?? and im running 210 jet currently looking for upgrade

 im struggling with the turm plug chop also....never hurd it b4 untill i came on here

is it the same meaning as checking the colour of the plug to all whos sayin it ????



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stroker


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I never heard of it either but persume its to do with the heat range ie br8es or br9es?

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1990dtr (aka THIEF)


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i have no idea lol few people say to do it bud whats it advantages ????

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james
NORFE


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only thing i can think off is reading the plug clour afta the engines been running

here have a gander, its normally in all manuals aswell on 1 page

http://kereta.info/what-can-sparkplug-tell-us-about-our-engine/



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stroker


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god knows where plug chop came from lol sounds like you chop the plug up pmsl,

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NORFE


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i no mate thats what i was thinking and i thort wtf for ha ha, "check the plug" i think is more versatile lol 

 

smile



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stroker


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deffo m8

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fused420


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I was told a plug chop is when you rag the bike up to 3rd or 4th gear then while the engine is still at high revs, hit the kill switch and pull the clutch in, then once stopped, check the plug. That way you get an accurate reading of the plug when the engine is under load, and at most risk of going wrong.

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fused420


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I had to do this a lot while trying to get the jetting right on my old aprilia..

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Calum122


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You're right with your description of plug chop there fused.

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bobc


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Some say that a true plug chop entails a cutting off of the threads to reveal the white porcelain insulator at its base , the colour is revealed as a band a few mm thick at the base .

Bob



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NORFE


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never heard of that 1

or the term "plug chop" till i came on here lol

"check the plug" is all u need to do and see what colour the ground arm is and electrode tip

 

http://www.bcchapel.org/pages/0003/pg11.htm

 

see images  on this web page above



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Calum122


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Yeah but the plug chop is exactly the same just that you want to get the bike running at its peak performance!

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GADGET


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Yep full wack then chop the Throttle and clutch it ,also the colour should be checked right down in th hole not the tip,only racers would cut a plug down for a realy good look but they r highly tunned lumps 



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