Rattling noise

Rooster · Post by **Rooster** » Wed Jun 04, 2014 2:28 pm

When I let out the clutch and accelerate without a lot of rpm's I hear a rattling sound out of the bike, it's not there when it's idling or while riding just when trying to accelerate from a stop. The clutch seems to work fine it has no slip that I have noticed. Has anyone experienced this kind of an issue?

Killawife · Post by **Killawife** » Wed Jun 04, 2014 8:05 pm

Does the sound go away when you pull the clutch lever in?

Fatdog · Post by **Fatdog** » Thu Jun 05, 2014 12:54 pm

Are you saying the rattle is coming from the engine?
What bike is it?
The exup valve can make a rattle at the lower revs but not so noticeable at higher revs.

Rooster · Post by **Rooster** » Fri Jun 06, 2014 2:12 pm

Rattle comes as I'm letting out the clutch and opening the throttle while rolling forward from a stop, no rattle after clutch is fully released. If I rev it higher and slip the clutch the rattle seems unnoticeable.

It's a 1989 FZR1000

Rooster · Post by **Rooster** » Sat Jun 07, 2014 3:03 am

Hit the starter button tonight all got was a wack and then nothing. When I try rolling it back and forth in first with clutch lever pulled I can hear a rattle from the bottom of the engine, if I push the bike with the engine in neutral there is no rattling sound. My hope is someone will know what just happened, something loose in the transmission?

Fatdog · Post by **Fatdog** » Mon Jun 09, 2014 1:16 pm

For starters I would take the clutch apart and have a look to see anything broken.
Failing that you are probably looking at a full engine strip

to find the problem (could be your starter clutch giving up).

Rooster · Post by **Rooster** » Tue Jun 10, 2014 2:32 pm

I found a fuel locked cylinder after starting to tear down the bike and decided to explore the carbs, rusty crap was in all 4 and 3 of them were leaking one of course put 1/2 a tank of fuel into the engine. It still does not explain the rattle but I'm further ahead.

Killawife · Post by **Killawife** » Tue Jun 10, 2014 9:16 pm

Weird, that happened to me once. Cylinder full of fuel and the engine wouldn't turn over. I had to run-start it.

The carbs on these bikes seem to be the cause of a lot of problems. Anyone know of any carb swaps that work?

Rooster · Post by **Rooster** » Tue Jun 10, 2014 10:29 pm

Been staring at my sons gixxer 750 and wondering if
I could steal his fuel injection but maybe that's too much of a pain. I've heard of fuel injection swaps maybe an R1 donor?

Fatdog · Post by **Fatdog** » Wed Jun 11, 2014 11:55 pm

Fuel filling the cylinder can cause a Hydro-lock of the engine (i.e the engine won't turn over) and can wreak the engine if it happens at high revs.
Generally it's a faulty float valve or dirty carbs which is the cause.

Rooster · Post by **Rooster** » Sat Jun 14, 2014 5:23 pm

Found rust in all 4 carbs not a good thing, cleaned them out, am looking for a better filter and think I'm onto something better. found my EXUP valve has end play and there seems to be pieces/bolts missing from the assembly. Could be the rattle, someone have a photo of a valve with the chrome cover removed?

Fatdog · Post by **Fatdog** » Sat Jun 14, 2014 9:09 pm

Have a look at Yampug's thread `exup valve rebuild' in this section.
That has a photo of the exup valve.

Post by **nugget** » Sat Jun 14, 2014 9:40 pm

Here you are rooster. This is how it should look.

You'll notice the fork prongs are slightly higher than the hole behind. A few of us on here find it gives you a bit more low down grunt set like it is.

Rooster · Post by **Rooster** » Sat Jun 14, 2014 10:21 pm

Thanks for the photo and link suggestion, I'm not missing much just the bolt in the middle