too much oil in blackbird

what are the consequences of doing this ? Seems like the previous owner
thought it should be at the top of the flat bit on the dipstick ( not
the upper line as per Haynes ). seems to go ok... no obvious trouble.
I've drained it out and there does not seem to be any coolant in
there...

 

I don't know specifically about the Blackbird but on some vehicles excess
oil can get blown into the airbox through the crankcase breather. This
happens on boxer twins. I'd whip the air filter out for a looksee.

 

Oil in the induction can affect fuel anti-knock properties.

I believe that another issue in the case of wet sump
engines (and I suppose that the Blackbird is such) is that it is
possible for the cranky bits to strike the oil and cause frothing.

The frothed oil then does not provide correct lubrication.

In bikes there may be more room for a sump since the
engine crank height is determined by banked ground clearance
and there may well be considerable vertical room available.
The oil system has to be designed to cope with
ferocious forward acceleration and also braking. There may well
be room for more overfill that might be expected in a car since
in that case the engine height is critical to CG height.

I have heard that this was an issue on Mk1 BMC 1800
1965 ish and that after a number of premature engine failures
the dipstick was re-calibrated correctly.

 

thanks. two inteligent sounding answers from UKRM I'm well chuffed,
I'll hook the air filter out next chance I get !

 

Do that air filter thing, it certainly won't do any harm.

However - and I'm no 'Bird expert - are you /certain/ that you are
reading the dipstick correctly - and with the stick in the correct
position? Some bikes require the stick to be fully screwed in, but
some (and iirc Honda is among them) require the dipstick to be
unscrewed and resting on the edge of the hole into which it screws, to
gain an accurate guage of the level of oil in the sump.

 

Oh yes, that's a given. That way lies a whole new sump of shit.

 

Easy-peasy. Try a dry-sump motor with a tall narrow oil tank.
The oil must be up to operating temperature and the bike absolutely
vertical or you will overfill it resulting in oil puking out of the
breather and in to the air box. From there it can dribble into the front
pot throttle body.

--

+-------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Gilera Nordwest Yamaha WR250Z |
| Gilera GFR Moto Morini 2C/375 |
+-------------------------------------------------------------+

 

NX650 Dominators are good at that: they store the oil in the frame with a
dipstick near the top yoke. The little dipping reservoir drains as soon as
you put the bike on the side stand. I read the manual and learnt the
correct procedure for mine but many owners don't bother. I've heard
numerous reports of excess oil related issues over the years.

 

how f'f'ing bizarre is that then. I have a bit of a history of wrecking
bike engines, my old gs125 died by means of a dead cam. had a friend
machine the head to take a new bearing, my cb400n lasted two years of
cummuting with never any oil top ups and no changes, I learned the
hard way. The XX is sorted now, fresh oil and ready to go, it's going
to be nice and warm tomorrow .

 

The bike, not the weather, I assume.

 

good to know I'm not the only one, I did have a look at the dip stick
before buying the bike, however it was on the side stand, and I thought
' great, golden'ish oil cant be bad '...

dude there is a tap under the tank if you want to fire her up with it
turned off it'll clear the carbs. Well recomended in my opinion,
although a good shot of redex in spring might be just as good. I bet
if she's been sat there for any length of time they are probably
already empty, mine seems to have a distinct petrolly smell like any
carb. should do . better still take advantage of this global warming
phenomina. and get out there and enjoy the balmy November weather. I
have been out cycling in my shorts today ( although I did have a hat
and gloves on ..)

 

no mate, it's forcast at 12 degrees... bloody tropical

 

Oil in the induction can set on fire and torch the engine whilst you're
driving into a petrol station and parking at a petrol pump.

DAMHIK, IJDOK [1]

P.

[1] Admittedly, in a cage ....