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so i got a 87 fz750 and i was riding it to school this moring, but when downshifting between 3rd and 2ed. the rpm droped to idel (as if it were in neutral but it was not) then without touching anything the back tire locked up as if it caught 2ed. It was a unexpected suprise but what does this...

thak you for all suggestions the 87 lives on!!kinda

no, I thought maybe the choke was getting stuck open, but it was not.

I thank you all for the reply's. This is a great site and im glad to be apart of it. It truns out it was the spark plug tubes were bad i replaced them a few days ago and the bike runs like a dream EXCEPT!!!!!! now when im ideling for about 20 seconds the bike will go from 900 rpm to 2100rpm I...

the more investage the more i agree, i just ordered the spark plug tubes from yamaha but the problem is that the wires are intergrated into the coil so therefore i cannot replace the wires withe out replaceing the coil, but i was curious to if anyone had a simular situation and used some kind of...

I just completed further tests, what i did was unplug coil pack A at idel and reved up and the bike ran ****** (as it should) then i pluged in the coil pack at idel (and obviously ideled the same) but as i reved up the bike started so sound normal! i think its a ground off the mani coil OR the...

im soory i did not meant the fireing order was 1,2,3,4 i was just trying to make it easy to visulize, and i mean it only sparks at high revs above 5000ish when u said internal insulation breacking down did u refer to the coil or the wire or both? thank you for help

My 1987 FZ750 is having a very interesting ignition problem, now first off let me explain the formation of my engine to my ignition coils. lets assume my enings piston are in order from left to right 1,2,3,4 and igniton coil on the left we will call igiton coil A, which feeds spark to cylinders...

Thank you for all the suggestions, is it possible the mainfold rubbers could create such drastic behavior? if so which rubbers the ones between the engine and the manifold or the ones between the mainfold and the air box? THANK YOU!

STILL on going problem, i cleaned out the carb's completly and still same problem so i began to thing maybe that the Timing was off but this bike does not have a distributer but a pick up coil assemble which i belive to be the equvilant to a cam shaft postioning sensour on modern fuel injected...

the bike does idel ok, but full throttle will studer, I am the owner of this old bike, bignoga was just posting as a favor to me