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Post by Tobyjugs on Jun 15, 2023 18:21:27 GMT 1
Great to see you fixed it. Are the plugs a nice brown colour now?
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Post by stusco on Jun 15, 2023 19:45:17 GMT 1
You can suffer(ride round ) a small splutter
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Post by vectisitch on Jun 15, 2023 22:26:27 GMT 1
You can suffer(ride round ) a small splutter Airscrews are at 1.5 turns out so I can fiddle with them a bit. I'll check the plugs after the next ride. Out of interest if dropping the needle one slot helped the stutter what does that suggest is the problem? Main jets slightly too big?
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Post by midlifecrisisrd on Jun 16, 2023 8:24:25 GMT 1
I'd say it just means your midrange fuelling is too rich but I'm slightly concerned that the top end fuelling may be lean
It's a difficult problem to solve without changing the needle to one that is leaner at the smaller openings
Steve
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Post by abar121 on Jun 16, 2023 11:44:28 GMT 1
Try pulling the choke during the stutter and see if it has any effect.
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Post by vectisitch on Mar 25, 2024 15:36:37 GMT 1
So i'm going to revisit this as over the winter i fitted a dynatek coil and a set of vforce4 reedblocks. I took off the 6mm reed spacers and lst ride out the stuttering had gone but on pull away the bike briefly bogs down and i have to rev it a little more to keep going. Not bad but it's there. The plugs look a little white to me so looking lean. As the bike is tuned with pipes i feel i'm missing out on some power so do want to remove the snorkles and fiddle with jetting but i don't want to drill the lid. Trouble is i can't find anywhere to buy genuine mikuni jets. Allens don't have any stock of 290 or 300 mains or 27.5 pilots
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Post by davecroucher57v on Mar 25, 2024 21:36:46 GMT 1
vforce4's like more pilot.i've 25's in the 350 and 27.5's in the421.
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Post by vectisitch on Mar 25, 2024 22:11:59 GMT 1
vforce4's like more pilot.i've 25's in the 350 and 27.5's in the421. Ok so 27.5 pilots and 290 mains with the top snorkle out. Is that a decent start?
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Post by dougw on Mar 26, 2024 13:09:10 GMT 1
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Post by vectisitch on Mar 26, 2024 17:46:55 GMT 1
They only had 1. I've sourced some 290 and 300 mains and some 25 and 27.5 pilots. I think I'll start with both snorkels removed and 27.5/300 jets
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Post by jessy03 on Mar 26, 2024 19:15:27 GMT 1
Similar to mine, 290/27.5 should be fine, with the snorkel out., I’ve since swapped to pwks.
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Post by vectisitch on Mar 26, 2024 19:50:14 GMT 1
Similar to mine, 290/27.5 should be fine, with the snorkel out., I’ve since swapped to pwks. Top snorkle or both?
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Post by jessy03 on Mar 26, 2024 19:55:55 GMT 1
Just the top snorkel, think the snorkel in the main box is for noise reduction?
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Post by midlifecrisisrd on Mar 26, 2024 20:52:05 GMT 1
I removed both 😬
If leaving the bottom one in try and get a 51l one
The 29l ones were on the lc2 and were longer
Steve
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Post by vectisitch on Mar 27, 2024 20:34:23 GMT 1
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Post by midlifecrisisrd on Mar 27, 2024 20:39:58 GMT 1
That does look like the short one
The actual part isn't marked, the actual airboxes are marked 29l and 51l but the only difference is the snorkel
Steve
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Post by vectisitch on Mar 27, 2024 21:03:48 GMT 1
That does look like the short one The actual part isn't marked, the actual airboxes are marked 29l and 51l but the only difference is the snorkel Steve Bought. So that in and top snorkle removed. 27.5 pilots and 290 mains. Wet weekend coming up so I can spend it in the laboratory
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Post by muttsnuts on Mar 27, 2024 21:08:45 GMT 1
They only had 1. I've sourced some 290 and 300 mains and some 25 and 27.5 pilots. I think I'll start with both snorkels removed and 27.5/300 jets I have loads of Mikuni and EBC jets for sale, I had them advertised in the "for sale" section, I am clearing loads of my jet stock out as I've moved over to one make of jet that I know I can get a reliable suply of any time I need If you need a selection of jets, mains or pilots, let me know
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Post by vectisitch on Apr 17, 2024 14:46:50 GMT 1
So an update on this. I took both snorkles out but replaced the long inner one with the shorter one suggested by midlifecrisis. I then fitted 27.5 pilots and 290 mains. The fuelling seems spot on and there is no stuttering at all and she pulls like a train cleanly right round to the redline. I'm a happy bunny.
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