FZR Help!

[mark247]

So i went into the shop today to see if i could make any progress. Instead of buying new valves i decided to try and mix and match two fzr400 heads ( both with shagged inlet valves ) and find 8 good valves to make one good head. But both heads had too many shagged inlet valves to be any good. So i have bought a second hand head in good condition from the japanese bike wrecker place in christchurch along with a set of pistons with rings and a barrel which he tells me are in good condition.

So after taking all the valves out trying to work out 8 good ones and realising too many were stuffed, all i managed to do was pull the barrel off.

Oh well, parts should be here in the next couple of days, then i will take the old pistons out and put all the replacement parts on.

Here are some photos, I tried to take a photo to show how stuffed one of the valves were but it was too blurry. Oh well!

[Paul in NZ]

Looks a tidy bike...

Photo is a bit fuzzy - why are the valves stuffed?

[mark247]

Looks a tidy bike...

Photo is a bit fuzzy - why are the valves stuffed?

It is a reasonably tidy bike, has a dent in the tank cover which is the worst part of it.

Most of the valves have an obvious lip where they have indented into the head. It is what happened to my mates FZR400 as well, causing it to loose compression like mine, but mine was blowing smoke as well, and from the look of the barrels the oil is coming through the rings.

With all the replacement parts it should be back on the road. Then I am planning on selling it on as soon as possible because I am spending too much money on bikes at the moment. lol!

[Paul in NZ]

It is a reasonably tidy bike, has a dent in the tank cover which is the worst part of it.

Most of the valves have an obvious lip where they have indented into the head. It is what happened to my mates FZR400 as well, causing it to loose compression like mine, but mine was blowing smoke as well, and from the look of the barrels the oil is coming through the rings.

With all the replacement parts it should be back on the road. Then I am planning on selling it on as soon as possible because I am spending too much money on bikes at the moment. lol!

I assume its the inlet valves that are gone??

Money spent on bikes is an investment in your mental health! It should be tax deductable...

[mark247]

I assume its the inlet valves that are gone??

Money spent on bikes is an investment in your mental health! It should be tax deductable...

yep of course. inlets it in. the exhaust ones are fine. oh well! fingers crossed the new head that is coming is a minter!

and i totally agree. i think people should pay me to work on my own bike because its for the good of society that i am in the shed working on my bike, instead of out being a hoolagan on it.

[moT]

are you useing my old head!!!!! to mix and match

[mark247]

are you useing my old head!!!!! to mix and match

i was going to, but every single inlet valve in your old head was totally and utterly FUCKED

[moT]

its true fzrs have valve problems!!!! get a NC30 they have no problems except a reg/rec which is easely fixed and impoundments

[mark247]

my head and barrel etc should be here on friday. and my head gasket and base gasket should be here tomorrow. so hopefully this saturday she'll be back and going!

[mark247]

So i we got the bike going today. The replacement head i got was farked so i just nicked a few of the good valves out of it and put them in my head. The mechanic ( had it at the shop, but i have done a lot of the work myself in there ) got it together and it still had bad as compression on 2 ofd the cylinders, so he got the valves tested and we did a valve grind and gave some of them the mean buff ups and put them back in. Got the engine back together and managed to get it going. Now all its needs is a tune up and it should be all back together and on the road again. ANYONE wanna buy a FZR400??? It will be running mint!!

[mark247]

Ok the bike has a little problem now. Since i have had it back it has been running all well until now. I was riding along and it started back firing and spluttering if i try to rev it over 6000rpm. It then fixed itself but has started doing it again now. If i have it in neutral it revs out with no problems at all, but as soon as i try to rev it out when it is actually moving it just back fires and splutters. Any ideas?

I have put a bottle of carb cleaner in the tank, and i checked the spark plug caps but it is still doing it. Help!

[TonyB]

I've got no idea why it wouldn't start initially, but as Paul in NZ said, hard starting can be a sign of the valves being out of adjustment. Its not something that would happen instantly though.

As an aside, if you've flooded an engine, the best way of starting it it to give it full throttle and leave it there, don't let it off at all until it starts.

edit: just noticed the thread went for 4 pages....remind me not to post when I have the flu

[Paul in NZ]

Ok the bike has a little problem now. Since i have had it back it has been running all well until now. I was riding along and it started back firing and spluttering if i try to rev it over 6000rpm. It then fixed itself but has started doing it again now. If i have it in neutral it revs out with no problems at all, but as soon as i try to rev it out when it is actually moving it just back fires and splutters. Any ideas?

I have put a bottle of carb cleaner in the tank, and i checked the spark plug caps but it is still doing it. Help!

Go back to the shop and do another leak down test - could be head gasket not sealed or carb related....