Lumenition problem?

[Kevin Garrod]

kev
how much clearence is there between the carb tops and the underside of the aircleaner?
i KNOW ON HOLLEYS
fitting low riders can be a problem, with the carb breathing at wot

alan

I don't think that is the problem, when I was on the RR there was no filter fitted and the mis-fire was still there.

[stag157.7]

I don't think that is the problem, when I was on the RR there was no filter fitted and the mis-fire was still there.

ok it was just a thought

alan

[Kevin Garrod]

ok it was just a thought

alan

Keep 'em coming!!!

[stag157.7]

are you sure the plugs are good? failing under load,as these can be common parts to fail
they might look ok

alan

[Kevin Garrod]

I suppose the only way to find out is to replace them and see what happens.

[Kevin Garrod]

When I was at the RR the guy checked my plugs and said the gap was a bit big (0.8mm), I thought that a slightly larger than standard gap would be a good thing assuming the rest of the HT system was in good order. Have I been stupid? Could my problems be down to the plug gap?
BTW I'm using NGK BP5E as recommended by LDparts and others.

[Guest]

Hi Kev, no i didn't get a PM from yu.

Jason

[Kevin Garrod]

Hi Kev, no i didn't get a PM from yu.

Jason

Re-sent

[DJT]

When I was at the RR the guy checked my plugs and said the gap was a bit big (0.8mm), I thought that a slightly larger than standard gap would be a good thing assuming the rest of the HT system was in good order. Have I been stupid? Could my problems be down to the plug gap?
BTW I'm using NGK BP5E as recommended by LDparts and others.

Kev,

FWIW Tony Hart always used to recommend Champion plugs because he found that NGK could cause the fault you have. May be worth contacting him direct for his current opinion.

Dave

[kgnich]

Kev,

FWIW Tony Hart always used to recommend Champion plugs because he found that NGK could cause the fault you have. May be worth contacting him direct for his current opinion.

Dave

...and I too have found that NGK plugs don't suit my car. They last about 1000 miles before behaving as you describe - I've tried two sets and now use Champions - never had a problem since. I know others find the other way around but I'd suggest you try the Champions.

Graham