[4000 rpm breakdown????]

Hi ive got exactly the same bike with exactly the same problem ive had it in bike shop for about four months, and 700 quid later they gave up, they said it was electrical to start with and two months of investigation later from the so called authorised yamaha dealer found nothing wrong.. then they said it was fuel/carburetor problem and after another two months two cdi units new plugs and a new set of carbs it was still the same and they still wouldnt admit they couldnt sort it so i told them to bring it back and now it doesnt work at all, so much for yamaha dealer..

the few things ive found on the interneck are:

yzf750 tuning story or "Why some it's hard to believe some people."

TECH Notes:

1. Check needle jets for wear!

2. EXUP motor (or similar) MUST be attached or engine will not rev above 4000 rpm

Above quote is here

there's some more links on this website as well, from what ive found you have to make sure the exup valve cables are adjusted properly no more thn 1.5 mm of play and that it is operating properly.

let me know how you get on I still cant get mine going after the shop returned it

Hi peoples, got an old 93 yzf 750, she breaks down @ 4000 rpm, sometimes it will spit an sutter till she breaks free, and off she goes, taken out the exup cleaned greased, no differnce, cleaned carbies, no differnce, fuel pump, seems ok, starts, idles, and once through, (if it breaks through) breaking down stage, it actually goes ok. 37.000 klms on the clock, presume to be actual, so up for major service, so is it timing, valves throttle senser?? what ever they do, battery, seems fine never hurd of charging causing this

When in nutural it will some times rev its tits off at first then will go into breakdown at the 4grand mark, so sounds like fuel BUT????? Help!

[YZF750r float hieght settings ???]

Look here you might find something helpfull.

http://www.byownerpros.com/fzr/

Thanks thats a lot lot clearer than anything ive seen so far, but i still need the hieght setting the fzr is different from the yzf, at the moment mine are at about 12 mm and i dont know whether theyre right or not, or what to set them to.

Thanks

Phil

[YZF750r float hieght settings ???]

Hi

Any one any ideas how to set float hieghts on yzf 750r (93 model) haynes manual dont tell you much other than fuel level , how can i set floats with carbs off without putting them togethet filling with fuel then stripping down again, ive seen a guage for doing this but that dont give the hieght settings,

Thanks

Phil

[YZF 750r Wont rev above 4000rpm]

Help..

Help..Please

I have a yzf 750r 93-94 model with a Factory pro kit installed, not sure which one but it has k&n foam filters on the carbs. It wont rev above 4000 revs and cant figure out why (nor can my local bike shop), can anyone let me know exactly what mods are made to the carbs please, it was done when i bought the bike and i have no info on it. I noticed on factory pro site it says bike wont rev above 4000 if exup motor or similar is not installed ,can anyone tell me exactly what this means and why it wont rev above 4000 because this is exactly the problem i have and the exup motor seems to be working fine.

can you please help its getting embarassing when vw beetles are out dragging me from the lights.

Please help i'm desperate....

Thanks

Phil

Also looking for a set of standard carbs

[YZF 750 R rev limiter problem]

Hello,

I have a problem with rev limiter coming in at 3000 revs on a yzf 750r but if i flick the engine run switch off and back on its ok for a bit then it does it again, weve tried everything fuel side and plugs leads and cdi units, also reserve switch on and off, nothings cured it yet, anyone heard of this problem or experienced anything like it any response would be greatly appreciated.

Thanks

Phil.

[Nitrous]

Hi

Look here ( http://www.wizardsofnos.com/index2.html ) goto prices tab youll find bike kit

They installed mine , BUT you have to have it disabled for general road use I couldnt find an insurace company in the country to insure it with the nos system on and operational, that was last year though so you could search around.

Any way apart from the nos kit you also need a maximiser to control it and a purge system and preferably an electronic quickshifter for the gears ( you dont want to be pulling the clutch in with nos engaged )

I would also advise that you have it installed by proffessionals such as those above, but they can be fitted at home, however if not fitted properly and set up correctly they can go bang, as well as blowing your engine they can be as dangerous as bombs, the nos is under very high pressure and any high pressure oxidizer in proximity to high octane fuel is dangerous and they do come together in the engine and can explode if uncontrolled.

I dont want to put you off but do a lot of research ask a lot of questions and if you dont feel totally confident about fitting very high pressure oxidizing gasses to your fuel system then dont do it, however if you do or have it fitted for you good luck with it id like to see some pics of it when it finished.

Phil

I have a 2007 yamaha r6s with the following modifications

-yoshimura trc carbon fiber slip on exhaust

-K&N air filter

-Type III powercommander

-competition werkes fender kit

-puig dark smoke screen

-carbon fiber racing pegs

-black shitfter

-pig spotter rear view mirrors

-elctro pod led neon kit (red)

-carbon tank pad

-carbon look grips

-led flush mount signals

-H7 neon headlights (blue)

soon to come aluminum radiator fan, low jack alaram kit, steering damper, black rear sets.

Seriously considering Nitrous oxide kit was wondering if anybody has a kit already and was wondering if it was worth the money and any suggestions as to what brand is best? Since I do not have high comp pistons yet was just gonna outfit with smaller 20 shot nozzle!

[Mt YZF750 with NOS]