Jota hot starting

Mazda Tribute, 3litre V6. It's tight in the engine bay, the alternator was replaced a while back, via the driver's wheel well. The rear bank of plugs is very hard to get at
 
Vince said:
Mazda Tribute, 3litre V6. It's tight in the engine bay, the alternator was replaced a while back, via the driver's wheel well. The rear bank of plugs is very hard to get at
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I didn't know they were a sideways V6. Lack of access for maintenance is an issue with many modern cars. That's why I don't have one. I do nearly all of my own maintenance. It would seriously give me the shits if I couldn't get at stuff.
 
Cam,

Champion NxC eg. are advertised as having a Cu core, not the centre electrode in Cu.

I've found iridium plugs to be a bit fickle in the old clunkers, they're designed for use with modern fuel management systems and last up to 100000km in many auto engines without excessive wear at the electrode tips. Fouling seems to be very common when used on carburated engines. Gold and platinum electrode plugs seem to work fine though, even the old Bosch silver electrode type worked well.

Lots of east-west V6s about these days.

piet
 
Mole87 said:
After riding my Jota for the first time a few weeks ago, I noticed it was missing when I tried to rev over 5k. It also was a pig to start when warm. I have since stripped the carbs, cleaned and replaced gaskets etc
Starts fine off the choke, warms up, ticks over be it a bit lumpy at about 1500 revs. Turn it off. Struggles to start
I thought it may be heat sync but the inlet stubs have nylon bushes and there’s little heat in the carbs
Any ideas?
1980 180 Jota
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Took bike for its first proper run today. Runs fine, picks up really smoothly. Ticks over nicely. Turn off when hot, still wont start. Battery is 12.9v, plugs are new. ?????
 
Does your bike have the original BTZ ignition and Nippon Denso HT coils? Any wiring modifications? Have you replaced the plug caps?
 
Never had the problem of not starting when hot with my Jota but i know others who have , and i've also been advised by people far more knowledgeable than me that they sometimes need a bit of choke with no throttle - even when hot, worth a try.
 
philw said:
Never had the problem of not starting when hot with my Jota but i know others who have , and i've also been advised by people far more knowledgeable than me that they sometimes need a bit of choke with no throttle - even when hot, worth a try.
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I understand it’s a DelOrto thing, they don’t give quite enough fuel at cranking speed, even if they foul plugs at idle.
Although this can be a bit controversial 😁
 
My Jota usually needs a bit of choke when hot. Sometimes it'll start without, but if it doesn't start straight away, I give it some choke, then flick the choke off as soon as it starts.
It was like that with the old Dellortos, and it's still the same with the Mikunis that are now on it. It's always liked a bit of choke.
 
Perhaps it's easier if you recognise that the control under the left hand side, front of the tank, is not a "Choke", it's a "Starter Enrichment", on the Dellortos.
As above, some need it, even when hot, mine doesn't.
 
Paul Marx said:
Your SF was very poor on the idle jets if I remember correctly.
Paul
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Someone else, Paul. My SF was always spot on for carburation. I used to tune them (and every other brand of moto) for a living.

Sometimes a little 'enrichment' just made it easier to fire it up when hot. It was usually if the motor had been stopped for several minutes but was still 'hot' that it liked a little extra juice.
 
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