My fzr wont run after the mechanic touched her

[yamaha_george]

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

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

SS,
what when on with the shimulator ? we need to know in case it is failing all of us.
Another member JAX did a similar thing but I could not test it as it was based on a windows set of files & we here use Linux, had it just been a spreadsheet alone we can convert it but it had (as per Windoze ) all the usual proprietary crap to make it "fancy" without actually doing any thing for the math.

You might want to contact JAX direct to check your figures before laying out cash (assuming you are a winblows user <BG> )

[ssimonn]

I entered in my measured gap in then I entered the shim measurement ,I left the desired gap for intake/exhaust the same as that was already there as that was what I was after for my 250 anyway.
clicked the box a few times as suggested in the side panel , the only thing that changed was the top box of new shim size read [-11] ? all the other new shim size stayed 0 , nothing else worked on the page , eg the which shims can be reused function.

And yes using window . Not that the shimulator was really needed it only took minute or 2 to do manually since I drew up (printer not working) the layout page and filled in all the blanks while I was in the shed.

To get tdc of the other cyl's I used a close enough method (basic drawing below)green part is the back end of the vernier cal's. to get close enough to 180o from cyl 1's tdc

[ssimonn]

righto , valves are done and time to put the carbs back in , for which I have plenty of time to do this weekend as the ex has taken off with my kids and I have to wait till monday to be able to get a recovery order stupid fkn laws. anyway

main will be , 100's and 97.5
starter i have are 42.5 to high ??
pilot air jet 105

pilot jet 10

any thoughts on this mix ? or should i just wait till i have 102.5 mains ,, 12.5 pilots ,,and some 37.5 starters

i'm sure i do have the 102.5 and 37.5's here but i cant read what 3 of them are ? thoughts ??

[DonTZ125]

Why are you going with the smaller mains? The 3LN1 had the 102.5 / 100s; the 3LN3+ had 100 / 97.5. I'm not sure if that was a pollution or power thing.

[ssimonn]

only reason I am doing anything on the bike this weekend is to try and take my mind of the madness of my current life situation,
I didn't want to put the carbs back together at all until I had new jets but this gave me something to do .
Atleast now the bike runs , not any better than when I bought it , but ALOT better than when I had to reclaim it from the mechanic .
I just think I am expecting to much maybe from these small bikes. Back to the bike.. The mid throttle seem fine , but low and top throttle are crap . Low being the worst , gotta rev hard to move off.
What did seem bad on my carbs was the little rubber O ring that attaches the needle and seat body to the actual carb body , maybe that could have been why the bike was just bogging down , so they got replaced being a cheap item.
I still don't have a fuel pump due to funds , also I haven't really got into checking out the electrics either.
still very much a work in progress.

[DonTZ125]

Don't fret too much about the pump; they're more of a fashion accessory on the 3LNs. The 2KRs REALLY needed the pump to get more than about 2/3 of a tank out.

DO expect a lot of these little bikes - they like to be SCREAMED!

Check your float levels.

[ssimonn]

The float level comes to the bend in the carb about 10mm above the line mark on the carb.

Is there a measurement I can take with the bowls off to adjust float height ?

Rather than draining the fuel from the carbs , guessing , refitting , refueling ... damn not right rinse/repeat again and again ...

on my old gs 450 it was 13mm from contact to the needle (spring not depressed) measured to point on the float from the side of the carb.

[ssimonn]

I was about to post a vid. but I find the stupid parrot has chewed the end of my connecting cable

I set the float at 13mm (since i couldnt find the correct measurements), the bike starts well , idles ok .. better at take off but far from perfect , mid throttle is still awsome , full is useless..

The bike is popping a little at take off , lower revs, you'll hear it when i find a new cable to post the vid.
did i screw the timing , i got the marks all lined up to perfection , I thought ...
Pops , sort of a chug . at lower revs and sounds like the bike would be happy to give in , but gets it to mid throttle and i can take off ok , to quick for local riding but it gets the job done , then just putts along if the throttle is opened to much .

If I was on a hill the lack of power at full throttle would slow the bike rather than push it slowly up the hill .

oh and still no fuel pump , next week maybe..

[DonTZ125]

Low end - try reducing your float height. Have you checked your fuel height? There should be a line in the casting of the float bowl; run a 4mm clear line up beside it from the drain tap on one of your carburetors - engine off, the key and kill switches on, the fuel pump primed. The actual number is a bit of a debate; I BELIEVE it should be ~ 10.5mm ABOVE the line.

For the lack of top-end power - I can't remember seeing this, but have you checked your EXUP? Great mid-range and no top end is a classic sign of an EXUP locked in the down position. Actually, if it's in the half-way position, it might explain some of your bottom-end issues as well.

[ssimonn]

good question I am asking myself , as the exup was on the 'to-do' list last night .. but didn't get done. You can hear it sqeak in the start of the vid. maybe it is getting stuck ?

the video is currently being uploaded , should be ready soon but it's only of the bike stationary , I need to make one more for everyone to see the running issues.

anyway off to check the exup , after a quick exup how to search

edit: you'll also notice when the revs get to a certain point they just shoot up..

edit 2 : oh and no fuel pump yet , maybe within 7 days for that..

[DonTZ125]

http://www.cartestsoftware.com/fz1/exupmaintenance.html

Best EXUP maintenance site I've ever found...

[ssimonn]

Thanks Don

[ssimonn]

exup looks a little bit off

[DonTZ125]

How did he even get it back together that f'd up?!

Pull the cables off, make sure the servo works properly; put it back together RIGHT - see if you don't have a whole new bike!

[ssimonn]

if you saw the carbs when I first opened them , you'd understand how how possibly the exup got like this

edit : the cables were mismatched and are now on correctly. It didn't make a massive difference although it is better.

Take off is easier . the bike is still underpowered and when I open the throttle the bike , sounds like a backfire but quieter , at lower rev.popping sound.
I need to see to the tacho and get it working so I can be more accurate in my 'rev' desciption.