hi started up my bike today..
as you know i have recently rebuilt...new spark plug in one cylinder(i broke the other one, so the lower one still has the old one)

anyway...both cylinders fire and the bike revs nicely..
one thing tho...there is like no smoke comin from the lower cylinder(the one with old sparky)
when i rev high there is a few puffs here and there while the other cylinder is smokin nicely.


i had a look at the old plug and it was wet....
i dont understand how there iscombustion but there is no smoke?

gonna get a new plug anyway and see...but any ideas tho?

cheers.
_________________
Philip Ahn
MC21 NSR250R

im poor...

maybe now that youve done a rebuild the carbs need to be set!! it could be that before it was set up to run rich but noe its to much, I dont know for sure just an idea

No smoke and a wet plug? Sounds like it's not firing at al to me. Check the pipe is getting hot to be sure it's firing.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

yeah its definetly firing...the pipe is hot...as hot as the working one.
when i feel the exhaust comin out it feels a little weaker than the working one.

i will get new plug for that cylinder tomorro and see what happens
_________________
Philip Ahn
MC21 NSR250R

im poor...

Sounds as simple as that. Check the coil connections though, we've seen a few with pitting on the spade connectors of late, causing a voltage drop and crap spark.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

changed spark plug.
all is good now..both cylinders are smokin good on start up!

cheers
_________________
Philip Ahn
MC21 NSR250R

im poor...

hi, i just wanted to add...

i have pulled out the lower spark. the one that is messin up...and it is wet fouled...i will chek my connecting coil thing also.

is it my crank seal? please tell me no.

also...i have never had a 2 stroke before...and the crank case is quite loud when idling..clank clankity clank...soudns like it is hitting..is that normal?

cheers
_________________
Philip Ahn
MC21 NSR250R

im poor...

I'd like to know the answer to that too. When my bike is idling, it's so noisely clanking. Even though it was in neutral, I had always thought it was just my dry clutch
_________________
Jerry Lai
NSR250 [MC21SP]

my old R used to blow cold and didnt smoke much from one of the pipes and i am afraid it was my crank which Andy then replaced for me .

the clanking could be your dry clutch if you have one the R doesnt as standard but when idling my clutch (dry) sounds more like 'ting.....ting' than a clank clank, although i am no exspert it aint sounding to great for ya.
_________________
MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

the "clank clank" noise my be worn gearbox bearings, i had a similar noise on my nsr 125 also check that its not runng rich or to lean this can make some funny noises to

damn....yeah that cylinder is actually blowin "colder" smoke than the other one and not as much smoke.

well the bottom cylinder is running rich...it is wet fouled...
but is that due to the jetting ?

or is it actually fouling because of the possible messed up crank?

i guess it is hard for you guys top tell from reading off your screens...
_________________
Philip Ahn
MC21 NSR250R

im poor...

make sure the jetting is right first, also see if the spark plugs are the same heat range have a look at the air fillter it my be clogged if all is fine take off the stater cover and see if ther is any movement side to side or up and down of the fly wheel this can tell you if the journal bearings are worn

ok cool...fenton..

i will have a look at those and get back to you...

cheers
_________________
Philip Ahn
MC21 NSR250R

im poor...

can you get to listen to another two stroke? They do sound loud at idle compared to a four stroke, so the noise may be normal. No point panicking until it goes pop eh?

As for fouling the plug, it's either a badly setup carb, or the ignition circuit. Try swapping the coils over to see if the fault changes to the top cylinder.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

good idea dave...i will have a go at that also and let you guys know what happens...

yeah...i havent had the chance to listen to another 2 stroke yet...
any of you melbourne boys wanna come down to my place and have a chat?

wouldnt mind meeting some of you guys anyway..

cheers
_________________
Philip Ahn
MC21 NSR250R

im poor...