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Old 12 August 2014, 18:04   #1
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Honda Carb Strip Down.

The BF50 on our SR4 has gotton a bit lumpy at idle. As far as I can google, they are prone to this and the usual fault is carb clogging caused by stale fuel. I intend to pull the carbs apart and clean/service them at the end of the season.

Has anyone else had a crack at this procedure?
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Old 12 August 2014, 19:47   #2
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decent video on it here
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Old 14 August 2014, 11:44   #3
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Chuck some redex in the fuel first and see if it cleans it out.

It's a basic carb strip though, not hard and as long as you don't change any of the throttle butterfly adjustments you'll be fine.
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Old 14 August 2014, 13:42   #4
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Chuck some redex in the fuel first and see if it cleans it out.

It's a basic carb strip though, not hard and as long as you don't change any of the throttle butterfly adjustments you'll be fine.

Does redex work on carbs
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Old 14 August 2014, 14:27   #5
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Chuck some redex in the fuel first and see if it cleans it out.

It's a basic carb strip though, not hard and as long as you don't change any of the throttle butterfly adjustments you'll be fine.
Redex is a blast from the past. I remember the old man bunging it in his Viva after taking on some water contaminated petrol. It used to smoke for a mile or two. I'll redex her up Nos. ;-)
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Old 14 August 2014, 14:37   #6
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I would recommend checking the plugs first.

It could also just need a little adjustment of the carbs as that is quite common too.
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Old 14 August 2014, 14:41   #7
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I would recommend checking the plugs first.

It could also just need a little adjustment of the carbs as that is quite common too.
I changed the plugs about 8/10hrs ago. I didn't gap them though, just chucked them in straight out of the boxes. Should they be gapped these days?
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Old 14 August 2014, 15:06   #8
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I changed the plugs about 8/10hrs ago. I didn't gap them though, just chucked them in straight out of the boxes. Should they be gapped these days?

Nah mine av always been gapped near enough out of the box give it a spray with carb cleaner that cleans sh!! Out
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Old 14 August 2014, 15:17   #9
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Carb cleaner does naff all unless you use it to clean dismantled carbs

Yes gap them but you're unlikely to find it makes a massive difference as long as they're roughly right.
It's only the NGK plugs AFAIK with -10 at the end of the number that are properly factory gapped.

Redex will shift varnish/gum etc if it's very minor.
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Old 14 August 2014, 19:59   #10
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I changed the plugs about 8/10hrs ago. I didn't gap them though, just chucked them in straight out of the boxes. Should they be gapped these days?
Have you checked them since the engine started running rough? If not, do it. Carefully checked for cracked and carbon tracking. In fact if you have a backup set, put them in. I carry a spare set of plugs with me since I have a two stroke.
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