hi i bought an 87fzr750 and i swapped it with my 87 fz700 bike. it does not start, i really dont know why. all parts are in working order, i even bought extras. maybe it would be the cdi? i have tid14- 48 and 58. maybe i need 68? im going crazy trying to figure out why it wont start, it just turnsover. well the main question is if i need to tweek things alittle to make the engine compatible. idk
pls someone help me.

P. couple ?'s. am I right in you're putting a fz750 eng in a 700 chassis, and the 700 was running at the time. if so. no prob. drops right in, exhaust and coolant lines all fit,sprocket allignment ok, and since both were single pick-up models. should be a plug and go. if you have spark at all cyls at cranking, compresion and fuel,try this. the crank position sensor/pickup-coil has 3 leads. black=ground grey=feed to cdi orange =cdi Yamaha sometimes reversed the feeds of 1/4-2/3 in different applications. try swapping the orange and grey wires at the cdi. luck g.

thank you ganepeil for your response.
i did check both pick up coils the one the fzr750 originally had and the one that the fz700 engine had.
both pick up coils have only a black and a grey wire to the terminal that connects to the cdi, i couldnt find the orange wire lead. Should i but a pickup coil that has the 3 leads, maybe from a fzr1000?

thank you

thank you ganepeil for your response.
i did check both pick up coils the one the fzr750 originally had and the one that the fz700 engine had.
both pick up coils have only a black and a grey wire to the terminal that connects to the cdi, i couldnt find the orange wire lead. Should i but a pickup coil that has the 3 leads, maybe from a fzr1000?

thank you

p. have a 87 fz 750 which has 2 pick-op sensors. 1 on either side of crank. the wires from r/h sensor plug directly into cdi. while l/h plugs into a pig tail which enters harness which leads to cdi.and goes to a different post of cdi. when I swapped engines (750-1000) went from dual pick-up to single. and changed cdi boxes accordingly, but had to change feeds from crank sensor to get correct timing. thus my ? as to if you had spark at all cyls. as yam. used many cdis depending on on model and destination and the possibility of spark delivery being 180 degrees out. another quick check for this (if both engines were/are dual pick-up designs) would be swap connectors at ign. coils.and see if it starts. again this is only a viable test if you're getting spark. (as a side bar, the cdi sparks 1-4 coil simotaniously, then 2-3 again at the same time. 1 cyl getting fire on power stroke , the other getting a spark on an exhaust. hope this helps. G

should i swap the 2 ignition coils or the two wires from the terminals?
since my single sided pickup coil has two wires-the black and grey- should i switch it from: black_ Grey_
empty_ empty_

to: empty_ empty_
black_ Grey_
And i dont touch anything that goes to the cdi from the wiring harness: _ _ _
_ _ _ ?( it has 5 wires one is empty )

thanks again ganepeil!

P, sorry for delay, re-read post and realize probly miss-read your' entry. thought were installing fz 750 eng to fz 700 chassis and wire harness. and incorrectly assumed that the fz700 used dual pickups as does my 1ae 750. further research in the archives of the shop show that the fz700t (87) (the only year offered in USA )used single pick-up (gray & black wires only) while fzr 750/fzx700/fzr1000 used single pick-ups but w 3 wires (grey orange and black)i'm uncertain as to hw a single pickup with only 2 wires would send a signal to the cdi which could be recognised as either 1-4 or 2-3. but would try this if your 700 was running before swap. put 700 pick-up in 750 eng. use 700 cdi/w orig. connections and chk for run. if not, (or get back-fire ) either reverse the positions of the grey and orange wires exiting the 6 port connector at the cdi or si=mply swap the plug in connectors going to the 1-4 /2-3 ignition coils. again.this is moot unless your' getting spark at plugs. all this hanky panky is doing is changing the time at which spark is being delivered to the relitive holes by 180 degrees rotation of the crank.luck g

hi ganepeil, i put coil 1 on2 and coil 4 on3 i tried but no start. and also on the 6 port connector there was no grey but there was orange. i also tried starting fluid on the air box. do you have any other suggestions? maybe i did it wrong. maybe i need better carbs because i dont think it getting any fuel. fuel pump works, cdi, coils, everything works. maybe i should put the fzr750 cdi unit instead?

hi ganepeil i was wondering. should i buy the cdi that is used for the fzr engine instead of the one im using which is the fz700? i tried starting fluid in my engine still wont work. i drained some engine oil because i put 1 1/2 its engine capacity. by the way will it damage my engine if i overfill the engine with motor oil. pls respond when u get the chance

hi ganepeil i was wondering. should i buy the cdi that is used for the fzr engine instead of the one im using which is the fz700? i tried starting fluid in my engine still wont work. i drained some engine oil because i put 1 1/2 its engine capacity. by the way will it damage my engine if i overfill the engine with motor oil. pls respond when u get the chance