Good vibrations?

[2002tiil]

After rebuilding the engine (complete with new original seals, pistons etc), ultra sonic cleaned carbs, float heights adjusting (i measured 25 mm, my mechanic measured it with filled float bowls allso as in the manual) and new float valves, i still have a problem.

After that: Bogging on low revs (hears like 4 stroking), vibrations om higher revs,
Today i had a photoshoot with the bike for a magazine, short distance driving (and more bogging).
On the way home, vibrations at 4- 5000 rpm. After ca. 2 miles it was over. Sometimes good reaction on the throttle, and next: Revving is shite and no response.
At home i felt the temperature of the silencers: 3 were hot, right front one was less hot/ warm.
2 weeks ago i changed the plugs, installed BR9 hix, colour was good (coffee) of the old ones, only thing on the right front was a light spot on the (outside, ca 3 mm, rst was allso coffee). After installing these ones, less bogging and crisp on throttle.

Is there someone who can point where i find the problem? For me it's like a needle in the haystack...

I'm still thinking that mixture too rich but don't know where to search.

Thanks in forward for reply,

Richard

[Rick Lance]

Pull your spark plugs and mechanically determine when the RH side pistons are at TDC (top dead center). If they reach TDC together, your crank timing is out and is causing your vibration problem and possibly frothing your fuel.

[2002tiil]

Rick,

Thanks for reply: Fact is that the clutch cover has to come down anyway, the mechanic who has done my engine have to take care of an issue.Then we can look if the marks on the cranktiming are in line (correct me if i'm wrong)?

Grazie,

Richard

[Rick Lance]

You may want to re-read my post and do exactly what it says. What is the issue your mechanic has to address?

[2002tiil]

The issue is that at an oil leakage at this side.
Thanks for your input,

[vma500]

the choke plungers come back in its place ? try to disconnect the plunger assy and see if it helps

u did the balancer mod on the rear crank ?
how s the compression in all barrels ?


please tell us more so we can diagnose ur problem better

m.

[2smoke]

What needle position in the carbs? Middle?

[Rick Lance]

It is common for timing marks on the drive gears to be confusing or even double stamped at different locations. The motor's ignition design allows for running with the cranks either timed correctly or 180 dg out of phase. Obviously when the cranks are improperly timed, the counter-balancer is useless and in fact becomes a vibration enhancer. To confirm that the cranks are timed properly (opposite corner pistons traveling together) do the following:

Remove all spark plugs
Cut a soda straw in two equal lengths
Insert the straw straight down into the right front cylinder plug hole and turn the motor over until the piston pushes the straw all the way up, indicating TDC (top dead center) for that cylinder
Now insert the other straw straight down into the right rear cylinder plug hole
If the straw goes in 50 mm farther than the front cylinder, your cranks are timed correctly
If the straw goes in the same amount that the front, you are running with mis-timed cranks.

This is a common issue with the RZ5. Symptoms include substantial vibration that builds with rpm along with the potential for fueling problems brought on by excessive frothing of the fuel in the float bowls from vibration.

You may also want to check for a cracked or broken coil mount (upper and lower) that can cause one cylinder to misfire.

[tacky1]

As rick said. It sounds like either the cranks are out a tooth of two or maybe the balancer is out. The balance shaft has two marks right beside each other and is easy to get wrong.

[2002tiil]

Okay, thanks for the great help guys!
I'll check the timing on the cranks as soon i have to get the fairing down again for repairs, it's really good you told me what the difference (in length) is.

To all the remarks: I'll write it all down, will look into it before i bring it to the mechanic and will let you know

[two-stroke-brit]

It is common for timing marks on the drive gears to be confusing or even double stamped at different locations. The motor's ignition design allows for running with the cranks either timed correctly or 180 dg out of phase. Obviously when the cranks are improperly timed, the counter-balancer is useless and in fact becomes a vibration enhancer. :

my brother rebuilt a motor for me with the same error and when started it vibrated so bad it roamed around the garage by itself on the center stand .(spooky)

[2002tiil]

As Rick said,

I did the straw test on cilinder # 3 en 4 (right upper, right downer cilinder) I have a "big bang" engine/ both are on TDC at the same time.
That;ll be the fisrt issue to be solved saturday.

Thanks,

Ries

[phildu31]

It's not a big bang, you still have 2 at TDC and 2 at BDC and the same ignition timing.
Cranks should be modified to get a big bang.

[2002tiil]

Hi, if text is between quotation marks, then the words shouldn't be marked as specific what it says, at least in Dutchy country

[2002tiil]

Changed the crank and: Problem solved!
Many thanks,

Ries