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Carb advice

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ventYl

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  • Posts: 40
  • Joined: Sat Sep 05, 2015 1:02 pm
  • Bike owned: GSF 400 Bandit

Re: Carb advice

PostThu Aug 17, 2017 9:03 pm

Off-idle is governed by fuel screw and/or carb sync. First do the sync then adjust mixture, if needed. If mixture is not off quite a lot (you'd have unstable idle or bogging under WOT around 4k - 6k) it won't have big impact on carb sync.
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lknbandit400

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Re: Carb advice

PostWed Oct 04, 2017 3:02 am

Judging by your first post, I think you're the guy I'm messaging on Facebook on the GSF400 page about a set of carbs. I sent you pictures tonight.


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ventYl

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  • Bike owned: GSF 400 Bandit

Re: Carb advice

PostSat Nov 18, 2017 11:32 am

You judgement is wrong. I don't have Facebook account for more than 5 years :) If you still did not sort out the issue PM me and we will see what we can do about it.
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chalkysexplorer

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Re: Carb advice

PostMon Nov 27, 2017 4:25 am

Thought you guys would be pleased to know she's sorted. Grabbed a set of carbs off a guy on the FB page, thanks Greyson. Anyways, I've been in L.A. working but was home this week. Unpacked the new carbs, stripped my #3 and swapped the new parts into the replacement, cleaned #3. Quick bench sync, set the mixture screws at 2-1/2 and she fired right up and ran really nicely. Took her out for a ride and she running great, really put a smile on my face.

The wife and I went for a ride together the following day and she loves it!! She says she can feel the difference which is a plus. I told her not to be afraid of revving it a bit and the next thing you know, she's leaving every intersection like she's Valentino Rossi!!!

Also did a coil on plug swap with a set of coils of an R1 and made my own harness. Seems to make a small difference.

Since I'm back to L.A. tomorrow I dropped it at Vicious Cycles in PDX for a sync and fine tune while I'm away. Pretty chuffed, thanks for all your help.
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SevenThreeSeven

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Re: Carb advice

PostTue Nov 28, 2017 6:32 pm

chalkysexplorer wrote:Also did a coil on plug swap with a set of coils of an R1 and made my own harness. Seems to make a small difference.


Trying to calculate or verify the value/improvement to performance of the coil-on-plug (a.k.a. Stick Coil) conversion (when the OEM Suzuki CDI box is still used as the ignition control method) is a bit of a rabbit-hole of math with a lot of variables/possibilities/theories in play.

I've seen/read forum threads (on other motorcycle sites) where guys were endlessly debating this subject. In the case of the GSF400 you may have hit upon a lucky combination of the Dwell period commanded by the OEM Suzuki CDI box matching up very well with the OHM resistance measurements of the windings inside the R1 stick coils (one or both, the primary or the secondary or maybe even both of them) to produce a spark that is as good or better than the OEM coils.
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