Off idle flat spot cure

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octane
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Off idle flat spot cure

Post #1 by octane » Tue Aug 22, 2006 9:07 am

On Randaks magnificent site there's a piece about
off idle flat spot

He prescribes a cure witch is "cheap, but tedious".
heck! that's me: heap and tedious.-)

So while I did the carbs, I thought; why not give it a try



soldered up the jets using my mini flame-thingy
Image
Image


goodness; it is SO darn small.
Hard to control the solder.
It looked like a disaster area in a VERY miniature kind of way,
so I had to clean up the jet in one of these things (don't know the English word)
Image


and drilled a new hole.
I don't know about them inch. and micro drill numbers in the article,
but what is recommended is a size #98 jet or a size #100 jet.
In my book that's a 1mm hole
Image

witch ain't easy without a 'guide' (I just held the electric micro-drill in my hand)
Image

not so pretty.
Tried again
Image

that will have to do.




I'll put'em on my daily ride so I have a before/after comparison
Last edited by octane on Tue Feb 05, 2008 12:22 pm, edited 1 time in total.
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Post #2 by Whiskerfish » Tue Aug 22, 2006 10:12 am

so I had to clean up the jet in one of these things (don't know the English word)

"Tap" is what you use to clean out the threads on a Nut. "Die" is what you use to clean the threads on a bolt like you did there.
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Post #3 by octane » Tue Aug 22, 2006 2:42 pm

Thanks WF !

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Post #4 by rcmatt007 » Tue Aug 22, 2006 4:22 pm

dang, wf beat me too it.... just remember "tap" is something you put in a hole... like tapping a beer keg... "die" happens to the outside.... so as a teenage girl says, "Like I would just die to look that good"
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Post #5 by QUEEENlE » Tue Aug 22, 2006 5:51 pm

<rolling eyes>

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flat spot

Post #6 by muser3 » Wed Aug 30, 2006 9:54 pm

Octane, I did the same "fix" couple of years ago and used the micro drill recommenced in the article.
Had to order them.
I said" them" because they are supplied in lots of 10. Now I have nine of them which I'll never use. So if anyone needs a #62 micro drill, send me a pm with your address and I'll send one to you. I have nine to give away and they're small and will not require postage beyond regular letter postage. I'd much rather share them than have them rust or get lost.
Lee

As of June 2008 all drills have been used at least once. Several were returned for further recycling but they are now all gone.
Last edited by muser3 on Thu Jul 24, 2008 7:23 am, edited 1 time in total.
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Micro drills

Post #7 by jpbadger9 » Thu Jul 24, 2008 12:01 am

I picked up a set of 20 assorted micro-drills at Harbor Freight a few weeks ago. The biggest one in the set is a #62. $1.99

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Post #8 by Jason J » Tue Apr 21, 2009 7:08 pm

It was really easy to just drill out some #60 jets.......just my $0.02.

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Post #9 by BlueThunder » Thu Dec 03, 2009 7:32 pm

I'm just curious... wouldn't it be easier to just replace the jet with a #98?
They may not be available from Honda, but are from Sudco and other Keihin carb parts suppliers - even eBay.
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Re: Off idle flat spot cure

Post #10 by curtis.71 » Wed Apr 07, 2010 10:20 pm

whats the best way to get the jets out?

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Re: Off idle flat spot cure

Post #11 by KYpondman » Wed Apr 21, 2010 11:06 am

Just did this on a '77 and found a simple, neat way to do. Just a touch of flux and cut a 1/8" piece of solder and drop in from top. Held it in a 3rd hand and zapped it quickly with a torch. No excess solder to clean up. worked great and did all 4 in about 15 minutes including drilling.
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Re:

Post #12 by philjimpot » Wed Apr 21, 2010 1:39 pm

[quote="Jason J"]It was really easy to just drill out some #60 jets.......just my $0.02.[/quote]
That's what I did. Took about 5 minutes to drill all of them. I spent more time trying to track down a #62 drill bit.

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Re: Off idle flat spot cure

Post #13 by ericheath » Wed Apr 21, 2010 2:39 pm

Did this drilling out the jet WORK??? I am getting ready to rebuild a set of 77's. There is also a bit on Randakks site about putting a washer under the needle from the carb slides and recapturing some wiggle. Anyone tried that with success? It seems a bit vague to "recapture the wiggle" factor.

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Re: Off idle flat spot cure

Post #14 by Jason J » Tue Apr 27, 2010 11:48 pm

[quote="ericheath"]Did this drilling out the jet WORK??? I am getting ready to rebuild a set of 77's. There is also a bit on Randakks site about putting a washer under the needle from the carb slides and recapturing some wiggle. Anyone tried that with success? It seems a bit vague to "recapture the wiggle" factor.[/quote]

Yes and yes on both!

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Re: Off idle flat spot cure

Post #15 by ericheath » Mon May 17, 2010 3:24 pm

I posted this elsewhere, but just a touch of flux, then a touch with a small soldering iron and then the solder and there is no cleanup needed to the threads. It ended up being a neat, easy, inexpensive fix.


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