Compression PSI

[SLO]

What should compression PSI be on 143cc YUMINASHI big bore install be after break in?

 

[m in sc]

i can check mine in a day or so.

why is it running poorly or smoking?

 

[SLO]

No ,I did the oil spinner clean out,and it took 8 hrs, had to take apart and do over. !.5 hrs. Did not shine flashlight and notice shaft position already marked. I put in wrong position and it did not shift properly and locked up rear wheel when down shifting. Noticed a little metal on magnetic plug when draining oil. Should not have been there. Got it back together,and is functioning properly. I am going to go back to 13 tooth front sprocket. I just wanted to know if I damaged it,or just finalized break in. I did gap rings a little over, but I have been running Marvel Mystery in it,and plug is not lean. Probably fine,but it will not rev up like it needs to,as before without 13 tooth in front. Just would like to know if I got everything right.

 

[m in sc]

it wont affect the cyl. if anything, it may have shipped a gear tooth, maybe, but doubtful.... hence the magnetic swarf left on the drain plug. if you chipped part of the piston or anything that would make it into the crankcase.. it wouldn't be ferrous.

 

[SLO]

Thanks! It runs great now that I fixed my oversight. Was tired and should have slowed down,wasn't nearly as bad with the do over . Take small spring off brake mechanism,remove two bolts to move brake pedal out of way,remove front muffler guard, as well as kickstand out of way,first remove gear shift lever. Remove clutch adjust locking nut with washer and o ring.Parts will fall out,gotta have manual,and look at mark on gear shift lever so know where to put back. Oil spinner clean out. Forget about it! Put a magnetic GOLD PLUG in when it is brand new.

 

[SneakyDingo]

Was tired and should have slowed down

The entirety of most of my mechanical mistakes summarized in a single sentence. Glad it wasn't worse!

 

[SLO]

The entirety of most of my mechanical mistakes summarized in a single sentence. Glad it wasn't worse!

It runs great! I am anal about my modes of transport,especially when being stranded could be catastrophic. I treat all my machines like they were an aircraft. Ever been flying in a small plane when the pilot exclaims ( OH SHIT ! ). A few seconds later,she states, I might have forgot to turn off the coffee maker. For a few seconds it was serious! Ever been out to sea when the motor died? Some lucky bastard might own the RED ROCKET soon,when I make it as good as it can be. I bought a 2000 DR 200 SE yesterday with 2000 miles on it. I got to get rid of a truck or two and a motorcycle soon so I can do shit other than work on it. Like ride and enjoy. After back surgery,I could not handle the weight of anything more. I broke the mirror on the first day putting it in the shed ,and wasn't even on it. A year later ,two years after surgery,I am ready to move up to the big leagues! 200 cc ! Stop laughing! Four or more incidents in the first month,none since.

 

[m in sc]

as a very looong follow up/reply, well over 1k on mine, its at 205psi warm cranking compression

 

[SLO]

as a very looong follow up/reply, well over 1k on mine, its at 205psi warm cranking compression

Thanks. I checked mine at cold,and might be mistaken, but it was about 95 psi cold. I will check when warm. That would explain light smoke on startup,but it runs fantastic. I believe I can outrun my DR 200,and actually my KTM 390 adv on the roads I ride due to my lack of riding experience on a bigger bike. I am sure I over gapped the top rings by a a few thousandths. Top was probably 14 as well as second ring. I put the gaps 180 degrees apart hoping it might mitigate my mistake. One too many strokes with a file.It I can outrun cars on the twistys. I put snorkel hose back in place due to rain the other day,and noticed sound/performance difference right away,but ECU was correcting it soon after. Not sure,may have improved torque.

 

[m in sc]

make sure you hold the throttle wide open when checking.

im not sure whats up w the 390, but my old 390 duke would just beak 100 mph stock.

 

[m in sc]

dead cold, just checked it.

 

[m in sc]

for posterity, full temp.

 

[SLO]

make sure you hold the throttle wide open when checking.

im not sure whats up w the 390, but my old 390 duke would just beak 100 mph stock.

 

[SLO]

make sure you hold the throttle wide open when checking.

im not sure whats up w the 390, but my old 390 duke would just beak 100 mph stock.

I have not had the 390 over about 70 mph,but I have not been on a road that I can see more than a half mile straightaway,and deer,and lately bears are as common as cars on days I have been out. The KTM has a side stand safety feature that I am going to bypass. It caused me stall taking off from stop sign,and fell over and it has taken a couple of weeks to get back on it, I was lucky. Going slightly up and to the right,with slight downhill to right as I started from stop,got up to about 5 mph,stalled,then fell over before I could react. But I am not sure I could have stopped what happened. Start from stop,slight uphill,then sloped to right. 5 mph at best, 2 seconds ,on ground. Big bruises! Stupid safety shit has probably killed more sensible people,than morons it has saved.

 

[SLO]

for posterity, full temp.

I obviously have read it wrong. I did not know to have throttle wide open. I mean it actually wil go as fast as I want,I usually keep it under 55 mph. I was going up rt 600 from Chilhowie to Konnarock at midway point on hill from stop,and could maintain 45 mph in third gear. I could only get about 28 mph in second gear before BBK, and it was really struggling. Rolling hills ,55 mph uphill no problem,and after cresting a hill or two,I am not in the throttle over half the time to keep speed below 55 mph.