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Carb needle wear

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trophydave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote trophydave Quote  Post ReplyReply Direct Link To This Post Topic: Carb needle wear
    Posted: 10 Nov 2019 at 16:24
I have got the carbs off my V50 for a strip down and clean.One of the needles has a small amount of pitting on the parallel part of it just where it pokes out the bottom of the slide.The taper is undamaged.Should I get a new one?
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AdrianW View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AdrianW Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2019 at 16:45
Dave,
My V35II has the same on both needles, I wondered too.. Trouble is original needles seem to be like rocking horse extract..
My bike runs rich, is yours the same?? If it doesn't I wouldn't worry unduly..

Cheers,
Adrian
Bristol UK
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Andyb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andyb Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2019 at 17:22
Carbs always run rich as they wear, perhaps a good thing?  On the Rotax 912 engines that I work on I frequently lower the needles a notch to put the mid range mixture back to where it should be as wear is more between the needle / needle jet rather than main or pilot jets.
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c13pep View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2019 at 17:29
You will not be wasting money if you renew both the needles and their jets, my experience with V50s is that you have no idea how old anything is, so I err on the side of caution. As with the slides the needles and jets are a mechanically wearing item. I use Stein Dinse for carb spares but there are several others, as an idea I usually set aside £100 for carb kits when doing a restoration etc.

CHRIS


you can`t have any fun in a straight line

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Richard Hyatt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richard Hyatt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2019 at 19:02
I've had huge help from eurocarbs.
Helpful guy there

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trophydave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote trophydave Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2019 at 19:43
Thanks for the replies.The wifes cheapo Aldi untrasonic cleaner has been buzzing away most of the afternoon.So far I have found one slightly pitted needle,one needle with very faint wear marks that can just be seen but not felt with a fingernail.One blocked choke jet.Standard sized main jets(105) but the bike has K&N type pod filters,no airbox.The needle jets look ok through a magnifiying glass but the needles had been dropped a notch suggesting possible wear.
I balanced the carbs a few weeks ago,they were miles out,I put the rough feeling when riding down to that.Is it running rich?sorry no idea.To be honest the last Guzzi I rode was an 1100 California about 25 years ago so not much to go on.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2019 at 21:22
The needle jets are the most likely cuprit for wear, the needle flapping in it all the time. I could see the ovality in mine. Certainly renewing just the needle jets made a world of difference. The needles don't wear as much as the wear point varies.
Brian.

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trophydave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote trophydave Quote  Post ReplyReply Direct Link To This Post Posted: 16 Nov 2019 at 18:59
Armed with a bag of bits from Stein Dinse I put the carbs back together today,put them back on the bike and it runs.The tickover is a bit fast but I didnt want to start messing about with anything before getting it properly warmed up.Hopefully I will get a ride out tomorrow then stick the vacuum gauges on it.
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