Project success! and rough running question

[regcheeseman]

My NC30 was bought from fleabay as a runner and inspection verified that it ran.

I stripped it when I got it home and have been restoring it including the shock discovery of straightened forks and a bent lower yoke...

Anyway i came to start it again two days ago, no bodywork, no tank.

Using a lawnmower tank cable tied on and jump leads from the car as there was no battery she fired up straight away and ran a bit fruity with no endcan. :D

I killed the motor to fit the endcan and she wouldn't restart - just cranked and cranked and cranked and cranked with nothing but the odd cough and flame out the endcan.

Fearing I'd either flooded it or more likely popped the cdi (jumpleads hit frame) I gave up....

A few hours later hoping the flooding was gone I tried again - still no joy.

I ordered a fresh set of plugs and waited for them and the battery to arrive.

Well tonight I finally got the chance to fire my baby up.........

On the button - straight away Happy that the CDI was good I refitted the tank and edged her onto the road.

A few quick spins and I'm in heaven - with the only bugbear being an awful flatspot in the midrange, it did improve with a use (bike laid up for years) but is still rough.

Valve clearance are bang on - would REDEX clean the carbs or will I have to remove them or is it summat else????

[wullvfr]

hello,
the main fuse would have saved your cdi before anything like that could of happened.

its maybe worth while stripping the carbs off and giving them a clean but maybe try the redex first just to see if it works


william

[Neosophist]

imho redex is a waste of time and money, much better invested in a can of carb cleaner.

If it's been laid up strip them and do the job properly.

Some NC30's do have a noticable flat spot around 6000rpm. When you have the carbs apart see if the needles have movable circlips on them, if they do move the clip to the bottom one if it's in the middle, this will richen the mixture up a little and hopefully fix that flat spot.

[regcheeseman]

imho redex is a waste of time and money, much better invested in a can of carb cleaner.

I've never liked redex - prefer to do the job properly but having seen the location of the VFR carbs....

Anyway, surely a cleaner that actually flows through the jets would have more effect than a spray which just gets blown though the carb venturis and burnt?

When you have the carbs apart see if the needles have movable circlips on them, if they do move the clip to the bottom one if it's in the middle, this will richen the mixture up a little and hopefully fix that flat spot.

can I do the needles with the carbs in situ? are they setup lean as stock then? I've a yanagawa or summat full system???? So maybe that is throwing the fuelling off as well?

Anyway the more I run the bike - the better it gets, so I'll repair the bodywork and ride the little beastie to quantify exactly how much of an issue the flat spot is.

[Sligeach]

ie more effect than a spray which just gets blown though the carb venturis and burnt?

the reason he says a can of carb cleaner, is actually physcally disconnecting the carbs from the bike and taking them to pieces on the workbench, saturating every single last bit of them and blowing them off with an airline

[Neosophist]

Don't think you can remove all the tops with the carbs on.. There really not that difficult to work on, once you've done it once you can remove and clean and replace the carbs in just over an hour ^_^

And the carb-cleaner I meant to be used when the carbs look like this





..in pieces :D

[Neosophist]

ie more effect than a spray which just gets blown though the carb venturis and burnt?

the reason he says a can of carb cleaner, is actually physcally disconnecting the carbs from the bike and taking them to pieces on the workbench, saturating every single last bit of them and blowing them off with an airline

beat me too it! :D

[regcheeseman]

Cheers guys - the answer I'd give but didn't want to hear......

To paraphrase....."Do the job properly you slacker"

At the moment I'm on the other job that I've been putting off - glass fibre repairs.

All the various broken off lugs and splits have been plastic welded and now reinforced with glass.

I was tempted by chinese fairings until I found this forum and genuine bodywork costs £££££ so it's out with the dreaded Davids kit.