YZF750 - waterpump/oil pump?

[CMSMJ1]

Howdo Yamaha posse...

Being the sneaky git I am I have a YZF750 trackbike.

I'm getting low oil pressure and a leak from my waterpump - so, does one drive the other?

I get the feeling my water pump is on the way out and so not delivering the oil pressure.

Is that a sound theory?

Anyone got a fiche or a service manual for one? Would be useful to know whether i have to buy a thunderace motor instead of fixing this one

[Evilchicken0]

couldn't tell you .... but it might be worth having a scout on the web for a manual or getting a Hanyes / Clymer one. If it's a common problem then do a google search and it should come up in a YZF forum.

Maybe you should fit the T'Ace engine just to sure or build the two into one for the six speed box :)

[CMSMJ1]

Cheers man.. Yeah, sticking a bigger motor in it would be cool...but I have not got the strength! Got my no9 to fettle, my racebike to sort, another racebike to build and this bloody YZF causing me grief!

I've had a good goggle session on google but not common. I'll have to get in and see what's what I guess.

I assume the engine architecture is the same (or very similar) to the FZRs of the same time so will have a look at some of the resources on here.

[cagiva996]

yzf750 microfiche here http://62.5.189.98/yamahaeur/exist/moto ... 7/YZF750R/" onclick="window.open(this.href);return false; and if you can do the yzf750/1000 conversion do it.i had one and it was brilliant-mega motor great chassis-awsome track bike (till i smashed it to peices) i know where theres some good info on the conversion-if your interested ill find it and post a link to it

[CMSMJ1]

Cheers man. I cannot figure out from that how the 2 pumps might be related in drive.. how are the pumps driven?

Oil pump off a chain as per most moto
water pump ??

looking at motors it is cheaper to get an 'Ace rather than a YZF so if I need a motor..I suppose I had better do a good job of it...

[cagiva996]

what makes you think youve got low oil pressure? have you tested the oil pressure or is the red oil light coming on?

[CMSMJ1]

I have used this moto at a few trackdays and have had red oil light on a couple times. Filled up with a bit of oil and all good.



Last TD at Oulton I had an oil light early in the day so I stuck a few hundred ml in it and carrried on. However, during session 4 the light was coming on intermittently at high revs. As I parked it up and got on the stands it was pointed to me that I was leaking coolant. This is coming from the side of the casing, where the pump is.

The leak is ever so slightly dripping when the bike runs.

I assume this is related.

Any ideas most gratefully received.

[zimm]

arent YZF oil lights "oil level" lights rather than "oil pressure" lights .. ?

know my R6 is .. and the senders (common part) are known to fail ..

[CMSMJ1]

Dunno mate.

If so, then it is getting too much of a thirst for oil!! It has had the head sorted, reground valves and reset clearances etc so that is bob on. It goes lovely...

I will read the manual I have....see what is what.

[cagiva996]

yzf 750s do this,the oil light is only an oil level indicator not a pressure one.when i had my first yzf750(i had 2) it did this to me and i had a real panic,but a good few of them do this. mine would do it on fast right handers especially (my 750/1000 too) or when picking the bike up out of a tight corner and getting hard on the gas.i met alot of yzf owners whos bike did this as well.they do burn a bit of oil though both my 750s and my 750 hybrid like to sip a bit especially when thrashed-so i wouldnt worry just keep an eye on the oil level.