NEED HELP TO PUT ON THE ROAD AGAIN A SLEEPY FZR400

[Adriano]

Hi, I Need some tips for my FZR400 which was asleep for years before I bought it. When I Pick it up some work has been done, cleaned carbs, 4 new ngk sparks, motor oil... But I Feel that at 7500-8000 rpm it seems to choke/fail, it don't go over, or rare time does.... So, it is normal due the time it was stopped? Any advices? (notice:I drove only 2 short times) Thanks.
P.S.: It chokes while running with an gear engahed, but in neutral and turn the throttle It goes all the revs without problem...

[TomcatMJ]

Hi!
Sounds a bit like the carbs are dragging "false air" and so the motor is running way to lean whichs keeps him away from reving properly up when its under load...i guess it would be a good idea to check the rubber-joints between the carbs and the intake as well as the rubber-joints between the carbs and the airbox...maybe some of them are cracked or simply slipped off from the carbs.

Greets from Germany,
Tom

[willandrip]

Which country are you in ?
What is the exact model and year of manufacture ?

Notice I asked manufacture NOT registration.

Later models that were imported from Japan as used (grey) imports are fitted with a restriction circuit that may give your symptoms if operating incorrectly.

[Adriano]

I've gota an 1990 FZR400 3BF whith speedo in MPH and KMH below, the grey one bike.
Manufacture date , 7/1989 I guess.
Later models that were imported from Japan as used (grey) imports are fitted with a restriction circuit that may give your symptoms if operating incorrectly But in Neutral it revs well at this rpm's and above....
This symptom don't ocures every time, it does the most, but when I push the the bike to hight revs since the 2nd gear, 3rd and so one, sometimes it respondes, but sometimes don't...

Which country are you in ?
What is the exact model and year of manufacture ?

Notice I asked manufacture NOT registration.

Later models that were imported from Japan as used (grey) imports are fitted with a restriction circuit that may give your symptoms if operating incorrectly.

[TomcatMJ]

The 3BF doesn´t have any restrictions from factory, but here in europe theres sometimes an aftermaket-restrictionset added which restricts down to 25 kW / 34 PS but doesn´t directly restrict the speed
To distinguish between the 1989 Modelyear and the 1990 Modelyear is quiet easy ...the colourscheme of the 1990s Model is Black/Blue/Silver where the 3BF Models before are White/Red/Black if kept in original Styling...additional theres a difference in the Swingarm (Deltabox at the 1990s Model) and the 1990s Model has got 4 Pot Frontbrakecalipers where the 1988 and 1989 have got 2 Pot Frontbrakecalipers.
Maybe one or more Photos will help to clear which Model exactly you have...

Greets,
Tom

[Adriano]

Here is the bike. (The foto is not mine but the bike is the same)
How can I know if it has that restriction set?

The 3BF doesn´t have any restrictions from factory, but here in europe theres sometimes an aftermaket-restrictionset added which restricts down to 25 kW / 34 PS but doesn´t directly restrict the speed
To distinguish between the 1989 Modelyear and the 1990 Modelyear is quiet easy ...the colourscheme of the 1990s Model is Black/Blue/Silver where the 3BF Models before are White/Red/Black if kept in original Styling...additional theres a difference in the Swingarm (Deltabox at the 1990s Model) and the 1990s Model has got 4 Pot Frontbrakecalipers where the 1988 and 1989 have got 2 Pot Frontbrakecalipers.
Maybe one or more Photos will help to clear which Model exactly you have...

Greets,
Tom

[TomcatMJ]

Its quiet simple to identify a Restircor-Kit: WIthout a 1990s 3BF runs around 200 km/h Maximum Speed with a 140/60 18" Reartire..with a 150/60 18" perhaps 5-8 km/h more (a bit less if your weight is a bit higher, like me with my 110 kg )...with a Restrictor-Kit it will run between 160 km/h (or 180 if your own weight is light enough ) ...

The Restrictor-Kits usually contain 4 Washers which have to be mounted between the Aluminium Joints and the Cylinderhead and limit the Diameter of the Intake-Openings, additional they contain either a Metalpart which resticts the range of the Throttle-Cables (in german called "Gaszugwegbegrenzer") or(!) some parts which limit the range of the Needle-Pushers (in german called "Gasschieberanschläge")...if unsure just take the carbs off and look inside the Intakes, if you cand find any Washers reducing the Intakes Diameters, there are no wahsers mounted For removing the washers and the Pusher-restircotrs you will have to pull the carbs and Joints off, the Blockingparts for the Throttle-cables could possibly removed without unmounting the carbs,but when these Restirctros/Blockers are mounted the washers should be mounted also so that you nevertheless will have to unmount the carbs...

[Adriano]

Can you find a picture of that restrictor kit?
Well due the "problem" that I have and I haven't take the bike to the highway too, the only speed top that I've reached was 140kph in a secondary road when the bike rans well that time....
With those speeds you told this bike is quite amazing for the age and the engine capacity...

Thanks! (All of you)

[TomcatMJ]

http://www.ebay.de/itm/601328-Drosselsa ... 1181073458 <-There is such a Restrictor-Kit..i didn´t have such a kit inside my 3BF, so i don´t have own pictures of a Kit...
I guess when you get rid of the obvious "false Air"-Problem you will be suprprised how good the Revs come up for a 400

..and if someday its not enough power at all for you in your 3BF, then its even possible to transplant a 600s Motor in as the Motorblock of the 3HE (FZR 600) is the same as the one of the 3BF, only cylindersize, Ignition-Timing, the carbs and due to the other cylinders size the Exhaustpipes mounting angle differs ...but for the carbs it might be possible to just rejet the 3BF carbs to run the 600s motor with them..the tci should then be changed just due to the rev-limiter wich will prevent overrevving of the 600s motor when you try to use the 400s tci
So only minor changes will have to be done to make it a hybrid with lower weight than the original FZR 600 and instructions how to do this concrete are available here in this Forum (or maybe also in the Wiki and at least also at the fzrarchives )

But first get it to run as it should, as this will be enough power for normal usage to have fun with that 188 kg (wet-weight including fuel,oil and coolant) bike