Why is it...

That sometimes engines take ages to fire up when you've rebuilt them?

Just replaced the cylinder head on a '98 Bandit 600 for a mate, because
the numpty he bought it off had snapped two of the cam cap bolts.
Everything went together just perfect, but when it came to starting it
the bike flattened two fully charged batteries before eventually firing
and settling to a steady tickover when warm with no adjustments needed.
Why couldn't it have just started up from the beginning?

When the SR250 was rebuilt it fired up second stab of the button and
settled almost immediately, with a simple adjustment to the tickover
screw.

Puzzled


--
Lozzo
Triumph Daytona 955i SE
Suzuki SV650 K3
Honda CBR600 F-W
Yamaha SR250 SpazzTrakka
Suzuki GSX-R750L

 

2 days and umpteen flat batteries after rebuilding the lump in my MGB I
called up my BiL who was at the time a spanna monkey. 2 hours later he
turned up, put the key in and it fucking started.

After the hassle getting it running it turned out to be such a good
starter that every now and then it would fire as you turned on the
ignition and actually start. Disconcerting until you got used to it.

 

I have recently become the proud (second) owner of a Honda ST70 that had not
been used since 1981, I drained the petrol tank of what smelled like white
spirit, put some petrol in and it started second kick.
I have to admit, I was impressed.

 

"Shit in the carbs"

 

I drowned one of those numerous times in welsh bogs when I was a sprog.
They're indestructible.

--
Krusty
www.MuddyStuff.co.uk
Off-Road Classifieds

'02 MV Senna '03 Tiger 955i '96 Tiger '79 Fantic Hiro 250

 

Did you prime the carbs?

Had any oil run down the bores as the head was fitted?

New plugs or old?

Did you *do anything* just before it started, like wiggle the plug leads or
flick the kill-switch?

When it finally started, did all 4 pots chime in together or just 1 or 2
initially with the others catching-on after?

 

Dave Emerson says...

Yes, I left the fuel tank I use for carb balancing connected and turned
on for 5 minutes before trying to start it, knowing the carbs had been
emptied. I was checking carb balance after getting it started.

No, the cylinder head I fitted was bone dry of oil as it was a
replacement for a damaged one. When it arrived it had a bit of workshop
dust and grit in it so I gave it a damn good clean out with clean fresh
paraffin and then dried as much of it off with a clean rag, then emptied
a whole huge can of brake/parts cleaner in there to be sure I blasted
all the crap out of those hard to brush nooks and crannies. I left it to
air dry after that. The bores were also bone dry when the head went back
on. I lubed the cam journals and lobes as they were fitted and threw
some fresh oil in there for good luck before putting the cam cover back
on. The oil level was slightly low before I took the head off, so needed
topping up anyway.

Same plugs, which were replaced less than 500 miles ago, cleaned before
refitting to the new head.

Nope, just tried a second battery off my CBR600, which was brand new and
fully charged, which it flattened. Then put the original battery on
charge for a couple of hours, and within 2 or 3 minutes of trying it
fired up fairly nicely all of a sudden.

It spluttered, coughed and stopped a couple of times, then chimed in on
all four cylinders together and happily ticked over. Weird.


--
Lozzo
Triumph Daytona 955i SE
Suzuki SV650 K3
Honda CBR600 F-W
Yamaha SR250 SpazzTrakka
Suzuki GSX-R750L

 

SNIP Q&A

Just one of those things then....

 

Is this my mini meat loaf friend?

 

Molly says...

Yes, he seems chuffed to bits with it now. Thanks for sending him round.

--
Lozzo
Triumph Daytona 955i SE
Suzuki SV650 K3
Honda CBR600 F-W
Yamaha SR250 SpazzTrakka
Suzuki GSX-R750L

 

You've done enough for me so it's nice to repay a favour.

 

Or fucking obsolete, as I've just discovered. Big bumper Saab 900i had a
different header and front exhaust box assembly 1985-1986.

The front box on my 1985 big bumper 900 has just gone [1].


[1] This is 'just' as in six months ago but how now become even louder.

 

If you don't mind getting your hands dirty,
http://www.jetex.co.uk/website/jetexcustomexhaustparts.php should have
all the parts you need to either fit a new box or replace it with a bit
of pipe.


--
Krusty
www.MuddyStuff.co.uk
Off-Road Classifieds

'02 MV Senna '03 Tiger 955i '96 Tiger '79 Fantic Hiro 250

 

This is Sweller you're talking to.