Something wrong with bike. Advice please

[MSTRS:Me]

Ever heard of air jets?

Idle jet. Main jet. Both feed petrol. By means of air vacuum created by air passing through the carby throat. The air only passes through when the inlet valve is open and the piston is descending. Why would there be an air jet in a (relatively) simple carby-fed internal combustion engine?

[Katman]

Idle jet. Main jet. Both feed petrol. By means of air vacuum created by air passing through the carby throat. The air only passes through when the inlet valve is open and the piston is descending. Why would there be an air jet in a (relatively) simple carby-fed internal combustion engine?

Stick to signwriting.

[MSTRS:Me]

Stick to signwriting.

Very informative. Too difficult to actually post where/how an air jet is utilised? Perhaps with pictures?
Since you obviously know so much about them...

[Katman]

Air jets introduce a flow of air into the fueling circuits of carbs to help atomise the fuel before it's feed into the venturi.

Like I said, stick to something you have a few clues about.

[MSTRS:Me]

Like I said, stick to something you have a few clues about.

Good advice that applies to you as well. Not knowing about air jets does not mean I know nothing about engines.
Oddly enough, problems like the OP's are usually very simple, but damnably difficult to diagnose. Sometimes the wildest guess is the right solution. All suggestions so far could give symptoms as described.

[ManDownUnder]

Cheap and dirty test

Remove air filter
Ride it

If it goes ok then look no further

If not - see riffers post

[Katman]

All suggestions so far could give symptoms as described.

Except perhaps for "dust on the coils".

I mean - WTF?????

[MSTRS:Me]

Except for "dust on the coils".

I mean - WTF?????

Sad little man with nothing better to do than pick holes in people. Fuck off and check your tyre pressures.

[blossomsowner]

thanks for all the advice so far.....i've been really busy and have not done anything since i posted the question but hopefully tonight i can strip it down and start cleaning and checking all these bits mentioned. I will check back in with any results and progress. thanks heaps

[FruitLooPs]

I'm not sure what carbs it's got, but i'd wager they're Mikuni BST or simlar like the gsxr's had.

http://www.gixxer.com/forums/showthread.php?t=159718 fully illustrated guide on dismantling and reassembling carbs. Might need to sign up, not sure.


Another note, carb cleaner like CRC stuff will stuff rubber gaskets - so watch it, they swell to twice their size (eventually come back ok, but bad idea).

[blossomsowner]

some progress.......sort of.
finally had some time and managed to get carbs off ok, had service manual and the stuff from fruitloops link. So commandeered the lounge coffee table and started to take things to bits properly. Sadly for me I decided that it was all very fiddly and didn't want to wreck anything so before i made a mess of it put the bike back together again. And managed to do so correctly...thanks riffer for the whacking with a mallet and block of wood tip.
i did inspect sparkplugs and while they are not by any means new all seemed ok and in a uniform sort of condition.
so bike in one piece but i got it running again although no improvement is there yet.

for my next trick I will try some fuel additive carby cleaner stuff and see if it makes a difference.

i would be happy to pull carbs apart further but only with the supervision or help from someone who knows how to not wreck it and to put them back together again.

Otherwise might even take to local bike shop if nothing else works.

[FROSTY:Me]

i would be happy to pull carbs apart further but only with the supervision or help from someone who knows how to not wreck it and to put them back together again.

Otherwise might even take to local bike shop if nothing else works.

Dude--rip the fuckers back out--hop in yer cage and come out to my yard--We'll have dem carbs clean in a whissle.
Lis secret--One at a time so ya have the others fora reference

[blossomsowner]

Dude--rip the fuckers back out--hop in yer cage and come out to my yard--We'll have dem carbs clean in a whissle.
Lis secret--One at a time so ya have the others fora reference

thanks frosty.........will pm you if i can clear some time from work and family to arrange and come up..........fantastic offer.

[Blossom]

Darling just go see Frosty... You are not I repeat NOT riding my bike whilst yours is not running properly so get the girl fixed would ya... (Yes i am afraid its catching and my girl will get it next) lol.
Thanks for the offer Frosty

[FROSTY:Me]

Darling just go see Frosty... You are not I repeat NOT riding my bike whilst yours is not running properly so get the girl fixed would ya... (Yes i am afraid its catching and my girl will get it next) lol.
Thanks for the offer Frosty

Blosom--ya don't get it --Bikes are afraid of me. If he brings it here it will sit -NOt daring to run badly
-except ZXR400 racebikes but thats a whole other story