Posted by . on April 19, 2006, 1:41 am
>Failure to drop back to idle speeds is normally caused by one of two things:
>1. Air leakage around or through the intake boots
The first time I started the bike, I did notice one of the intake boots hadn't
seated fully around the carb intake. That was since corrected, and all the
clamps tightened down as far as possible.
>2. On non-CV carbs (which use a spring instead of a diaphragm,) the
>spring is either worn out, the wrong size, or missing altogether.
These are CV carbs; Hitachi, in fact.
>XJ bikes are also notoriously picky about carb tuning. Have you
>synchronized them yet?
Attempting to get ahold of the gauges for doing just that. Might not be
before this weekend.
>As for the white smoke, the XJ is water cooled, right? Could be a head
>gasket.
Neg; air cooled, this wee beastie is.
---------------------------------------------------------
Don't be paranoid. Everyone's not out to get you. I am.
---------------------------------------------------------
Posted by Polarhound on April 19, 2006, 6:07 am
. wrote:
>
>> Failure to drop back to idle speeds is normally caused by one of two things:
>>
>> 1. Air leakage around or through the intake boots
>
> The first time I started the bike, I did notice one of the intake boots hadn't
> seated fully around the carb intake. That was since corrected, and all the
> clamps tightened down as far as possible.
>> 2. On non-CV carbs (which use a spring instead of a diaphragm,) the
>> spring is either worn out, the wrong size, or missing altogether.
>
> These are CV carbs; Hitachi, in fact.
Sounds like the boots are still no good. They often crack from the
inside-out, and you can't see them until they get extremely bad.
Warm up the bike, then spray carb cleaner on the boots. If the RPMs
shoot up, the boots are bad. Boots from any bike during or previous to
the Reagan Administration should be replaced regardless.
>> XJ bikes are also notoriously picky about carb tuning. Have you
>> synchronized them yet?
>
> Attempting to get ahold of the gauges for doing just that. Might not be
> before this weekend.
>
>> As for the white smoke, the XJ is water cooled, right? Could be a head
>> gasket.
>
> Neg; air cooled, this wee beastie is.
White smoke is most often caused by water and/or coolant. It can also
be a sign of blowby on the rings. Run a compression test, or preferably
a leak-down test.
Posted by EffJay R. Yamaha on April 19, 2006, 9:39 am
. wrote:
>> As for the white smoke, the XJ is water cooled, right? Could be a
>> head gasket.
> Neg; air cooled, this wee beastie is.
That comes as a surprise to me. My XJ700 Maxim-X was definitely
water-cooled. At least, that's what I figured the radiator was for. <g>
Posted by Polarhound on April 19, 2006, 7:01 pm
EffJay R. Yamaha wrote:
> . wrote:
>>> As for the white smoke, the XJ is water cooled, right? Could be a
>>> head gasket.
>> Neg; air cooled, this wee beastie is.
>
> That comes as a surprise to me. My XJ700 Maxim-X was definitely
> water-cooled. At least, that's what I figured the radiator was for. <g>
>
>
Well, at least I know I wasn't TOTALLY off the mark! :)
Posted by ShadowHawk on April 19, 2006, 10:05 pm
>
> Failure to drop back to idle speeds is normally caused by one of two
> things:
>
> 1. Air leakage around or through the intake boots
I'm going to second the HIGH possibility of an air-leak - but keep an open
mind about this.. you may have the carb's airbox boots tight and the carb
manifold holders tight... and still get this symptom. Mine for a time was
caused by the butterfly valves (on the throttle linkages) not opening up at
the same time. One or 2 were actually held a tiny, tiny bit open while the
other 2 were closed tightly... just that *little* bit of air can lean out
the mixture and cause a racing idle speed. Check this by:
While bike is running at idle (if you can get it running now) - push down
on the synch screws - this *should* close off any of them that may not be
fully closing under the power/tension of the springs that pull them to the
closed position - if the idle speed lowers drastically - pull the carbs,
and adjust the butterfly valves so that they all open at the same time.
THen a good carb synch with mercury sticks or a Carbtune II is in order...
>
> 2. On non-CV carbs (which use a spring instead of a diaphragm,) the
> spring is either worn out, the wrong size, or missing altogether.
>
> XJ bikes are also notoriously picky about carb tuning. Have you
> synchronized them yet?
Good call...
> As for the white smoke, the XJ is water cooled, right? Could be a
> head gasket.
There are a few Xj's in the family that are water cooled - but IIRC - his
is an aircooled model...
> For the cutting-out problem:
> http://members.tripod.com/dave_jack/id41.htm
G'Luck!
Rex S.
Richardson, Tx
'82 XJ650 Maxim - The Beast
'82 XJ750 Seca - The New Ride
'82 XJ750 Maxim - The Project
'86 Shadow VT1100C - The Repo Project
http://www.treasureboards.com/cgi-bin/xj/webbbs_config.pl
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>1. Air leakage around or through the intake boots