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Old 05-30-2010, 09:55 PM   #1 (permalink)
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Running really rich

So, after installing S&S 510C cams in my 2000 TC88 I ran into something I may have created. Read on the forum here about a CV carb mod i.e. cutting 3 coils off of the vacuum slide return spring and drilling out the relief hole to 1/8". The bike fired right up and when rpms are up in the midrange it runs fine. But if I let it idle down toward idle speed it runs super rich and fouls the plugs dangit.

Now, previously I did a Stage 1 with bigger primary & secondary jets, K&N air filter with Screaming eagle back plate, and V&H Staggered straight shots. It ran like that for 18 to 20k until I lost an outter cam bearing. Hence the new cams.

I may have made an incorrect ASSumption that the CV mod was simply for better throttle response. I disassembled the carb and checked float settings and made sure the enrichener was not getting stuck. All looks really good and clean.

Any thoughts? or do I just bite the bullet and get another spring and vacuum slide?
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2000 Wide Glide Stage II
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Old 05-30-2010, 10:45 PM   #2 (permalink)
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If your carb is like the one on my sporty..HD carb there is an idle mixture adjustment screw on the bottom of the carb..you need to take the carb off and look see for a button sealing over the idle adjusment screw and then adjust the idle mixture there..I got the kit form CV performance and re-jetted and installed their ez-just idle screw and no more issues..before it would not idle and barked and choked at me..

maybe that will help you..the kit was about 45.00 if I recall right..

Sam
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Old 05-30-2010, 11:58 PM   #3 (permalink)
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well crap. Is my face ever red tonight.

Took a look at the exploded view of my carb in my shop manual...guess who put things in the slide in the wrong order...duh! So now with the needle inserted THEN the spring retainer...sigh. Thanks OMT for the reply. Something you said about the idle mixture etc. made me really look hard at how I put 'er back together.

Thanks!

BTW, the bike RIPS!!!
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"The difference between the impossible and the possible lies in a person's determination."
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2000 Wide Glide Stage II
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Old 05-31-2010, 12:04 AM   #4 (permalink)
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You drilled the hole in the slide? By cutting off some coils to the spring and drilling the hole in the slide you are making it easier for the slide to rise as there is less resistence on the slide thus requiring less pressure to move the slide up, thus raising the needle letting more fuel flow. If you didn't need to richen your mixture up then maybe that mod put you over the edge on running rich. If your sure it's only on the pilot circuit that's running rich you could always adjust the air fuel screw or just rejet with a smaller pilot, or buy a new spring and diagphram
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Old 05-31-2010, 12:05 AM   #5 (permalink)
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Glad you figured it out!
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Old 05-31-2010, 12:37 AM   #6 (permalink)
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Quote:
Originally Posted by JimmyG View Post
Glad you figured it out!
Yeah, me too! Thanks for the reply. I was considering putting the smaller jet and needle back in that I saved from the original setup a couple years ago.
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"The difference between the impossible and the possible lies in a person's determination."
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"It's easy to curb the freedoms of others when you see no immediate impact on your own."
Malcolm Forbes

"Give the gift of your absence to those who do not appreciate your presence."


2000 Wide Glide Stage II
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