My fzr wont run after the mechanic touched her

[ssimonn]

here's a short vid that will save tons of typing .
the mechanic is meant to have rejet the carbies , but i doubt he did anything except glue my air box on and shove a rag ontop so the tank would push it down more ??? seriously I found a folded rag when i pulled off the tank !!!

here's the vid , I get no revs after a couple of mins of warming it up, but after first start the bike will rev fine till this
http://www.youtube.com/watch?v=bbmsYTcN5G0

thanks ..

[ssimonn]

oh I'm asking where to start to get it going right ?

[kilika2]

I'm not as familiar with the 250 but it seems to me like when you turn the throttle the bike's not getting more gas. Is the throttle a 2 cable push and pull system? Are they both connected? I kind of assume that's what you are trying to show when you get close to the carbs but I couldn't really see.

Chris.

[ssimonn]

yeah it sounds like it isn't getting gas . I was trying to show the cables are connected , but it does rev for a couple of mins prior to stopping .
I might go back outside and pull off that filter and see if maybe thats holding back fuel...



edit : no the filters flowing fine

[yamaha_george]

Hi,
first you need the bike to just idle (that screw is down to the left under the main frame rail on FZR'600's so I am thinking it is probably there on the 250).

When the bike is cold and FZR's take quite awhile to warm up you will need to use the choke fully applied. Let the bike run idling until you hear her speed up the revs mine will go to 3K revs when warmish. slowly back off the choke unfil she idles at just under the 1K mark.
If she refuses to do that then you tweek the idle screw as described above until she stays stable at just about 1K revs no choke.
Then and only then should you use the throttle to see if she will rev.
TRY that and get back to us.

[ssimonn]

yeah still no good
I've pulled the carbs down and am just going to replace the jets since I can't read the size on most of them .
The bike was running hardcore rich as well , and the float level was at the bend in the float bowl instead of the line.
But without being able to read what jets are in there I'll replace them.
If anyone has a link to pictures on which jet is which would be awesome. I found this but I don't know which is the pilot air + the pilot jet , as I found 3 not 4 jets to unscrew....

{""""Main Jets: cyl 1-4 102.5, cyl 2-3 100
Jet Needle: all have 5CT7 written near the top.I also dropped the needles to the lowest. That is the little circlip is at the top most slit)
Pilot Air Jets: 105
Pilot Jets: 12.5
Pilot screw as always 3 turns out from full in
Starter jets: 37.5
The emulsion tubes all have N-8 written on the side."""" }
Also I seem to have low compression .
So first up I reckon I should reset the valve clearances then get back to the carbs with the new jets and float heights set correctly.
The bike does not blow smoke if anyone was wondering.

Also I live on the central coast NSW , if anyone would be able to drop 'round and help out , that'd be awsome
Also no fuel pump so thats on the list of things to get , I did read I can do without it but would prefer it there.

[yamaha_george]

SW,
check the WIKI for the carb pics by Rage Digital he also (?) did a How To on carb stripping and float height tool making which are in the WIKI

[ssimonn]

not looking good so far with the valve clearances , 0.08mm exhaust side on cyl 1 and 0.05mm on one of the inlet ports and if i push the 0.04mm (smallest I have) it goes in ,so if i guess it's between 0.00mm and 0.02mm on the other inlet.

So this is what causes my low compression

also when do i know for sure I am exactly 180o for cyl2 and 540o for cyl 3 or do i just go in when I see the cam lobes protruding on cyl 2 and 3 ?

[ssimonn]

sorry what I should have added when I was talking about my carbs is everything seems well while it was warming up , choke til it revs to high , turn off choke when it revs to much , idled fine ... put helmet and gear on and go to leave ,revs high to get up my steep driveway but it still bogs and dies , then stays off .... but I'll get back to that issue if it's still there after the carb checks I do and valves.

[yamaha_george]

not looking good so far with the valve clearances , 0.08mm exhaust side on cyl 1 and 0.05mm on one of the inlet ports and if i push the 0.04mm (smallest I have) it goes in ,so if i guess it's between 0.00mm and 0.02mm on the other inlet.

So this is what causes my low compression

also when do i know for sure I am exactly 180o for cyl2 and 540o for cyl 3 or do i just go in when I see the cam lobes protruding on cyl 2 and 3 ?

SS,
you are right sort valves then worry about carb setting

OK valve shims can be calculated with a program in the WIKI listed on this page:-

http://fzronline.com/wiki/doku.php?id=h ... clearances

your degreeing is taken off from top dead center for cyl No1 which is the left most when sitting on the bike, you can double check TDC with a small screw driver just to be sure.

[ssimonn]

ok back to the shed I go , heck it's only midninght plenty of shed time left

I'm still looking for a detailed jet description ..

[yamaha_george]

OK so pictures some in:-
viewtopic.php?f=8&t=5924&start=45

&


viewtopic.php?f=21&t=6089

I have seen a thread with Rage Digitals pics of the main & start jets hi-lighted but cannot find it at mo do a search for main jet or start jet.

[ssimonn]

2 hrs took longer than I thought .. nvm getting there







shimcalculator thingy didn't work for me , had to use my brain

[ssimonn]

Pilot Air Jets: 105
Pilot Jets: 12.5

just these 2

also in his pic he has 'main' marked where my 37.5 where ... cant read anything off the mutilated jets next to the 37.5's , and my eyes are not good enough to read the number on the jet that screws out of the hole (getting a magnifying glass tomorrow )

[kilika2]

I know I'm late on the ball. But you asked how to know that cylinder 2 and 3 were at tdc. Or at least the flywheel was at 270 and 540. My easiest way is to look at the rockers. They should be pointed away from each other towards the back of the engine and down towards the front wheel.

Figure one in this crappy photo.
Chris.