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Post by doink on Jan 31, 2020 13:35:00 GMT 1
Need some jetting advice on which way to go or what to do?
Specs are
YPVS 350 31k motor standard carbs
Ram air filters
Premix
Coolhead
Standard pipes
BR8ES plugs
Jets are
300 mains
Needles 4th from top
22.5 pilots air screws 2 turns out
Really rich until warmed up especially on one cylinder, plug black/fouling, thinking of dropping pilots to 20’s?
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Post by mak595 on Jan 31, 2020 21:32:14 GMT 1
Think standard main jets are 240....
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Post by Tobyjugs on Feb 1, 2020 11:26:45 GMT 1
Are your carbs really clean and in good working order?
Your pilots look too small now.
Put everything back to standard and start with the 300 mains.
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Post by midlifecrisisrd on Feb 6, 2020 9:34:42 GMT 1
Pull the balls out the carbs and clean behind them as 22.5 pilot is way small for running filters
Usually have to go up 1 size not down
Steve
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Post by shaunthe2nd on Feb 6, 2020 11:12:05 GMT 1
Check choke circuit too if running rich one side until warm.
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Post by doink on Feb 11, 2020 19:40:55 GMT 1
Update : rode it to Germany, cdi and coil died in Rotterdam 18miles from Europoort, resulting in a 30 hour breakdown, now running lean, temp goes up when cracked open onto the main 🙃
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Post by marrcel on Feb 11, 2020 22:25:44 GMT 1
Tobyjugs is close to europort😉
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Post by doink on Feb 11, 2020 23:21:41 GMT 1
Got a zeel off Norbo brought over on the ferry with a friend, wired it in that morning, continued onto Germany, got back yesterday
Where should I be on the jetting now chaps?
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Post by Tobyjugs on Feb 12, 2020 8:29:28 GMT 1
Update : rode it to Germany, cdi and coil died in Rotterdam 18miles from Europoort, resulting in a 30 hour breakdown, now running lean, temp goes up when cracked open onto the main 🙃 Strange that. I was contacted last week by Kees and he asked me if i had a CDI as someone had broken down in Rotterdam. Was that you? What is your jetting spec now? |
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Post by doink on Feb 12, 2020 10:20:39 GMT 1
Yes, Thursday/Friday morning was my breakdown
Currently on
22.5 pilot
Needle 4th clip
Mains 270
Warms up when opened up onto the main which tells me it’s lean?
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Post by muttsnuts on Feb 12, 2020 10:57:21 GMT 1
might be too advanced on the timing ....... or even too retarded, both will cause the engine to heat up
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Post by jessy03 on Feb 12, 2020 12:14:57 GMT 1
Assuming 31k carbs - 27.5 pilot or 30 and 400 mains, lean jetting will end up with a holed piston, don’t ask how I know👎🏻
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Post by 4l04ever on Feb 15, 2020 1:45:39 GMT 1
Plugs should be 9s really, but you are fouling 8s!!
Ramair filters flow loads more air than standard airbox, so as above, start at around 400 mains.
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Post by rasteirinho on Apr 6, 2020 21:12:53 GMT 1
Plugs should be 9s really, but you are fouling 8s!! Ramair filters flow loads more air than standard airbox, so as above, start at around 400 mains. can you tell me what you are running on your bike? |
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Post by 4l04ever on Apr 6, 2020 21:46:30 GMT 1
I am running B10EG plugs with 280 main jets and 25 pilot jets in 4L0-01 carbs. Modified Standard airbox with filter - has a lot bigger inlet!
Tuned 4L0 cylinders with TSA high revving pipes with peak power at 9800rpm. Zeeltronic Ignition.
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Post by rasteirinho on Apr 6, 2020 23:18:09 GMT 1
I am running B10EG plugs with 280 main jets and 25 pilot jets in 4L0-01 carbs. Modified Standard airbox with filter - has a lot bigger inlet! Tuned 4L0 cylinders with TSA high revving pipes with peak power at 9800rpm. Zeeltronic Ignition. My RD350Lc 1980 has allspeeds short cans, 4L0 00 carbs, Ramair pod filters, stock igniton and exhaust port raised to 25mm from top of cylinder. What jetting would you recommend? |
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Post by 4l04ever on Apr 6, 2020 23:30:44 GMT 1
Have your carbs had the Yamaha modifications done or are they original? The Ramair filters will need huge main jets!
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Post by tacky1 on Apr 8, 2020 14:55:15 GMT 1
I would start big on the main jet and work back. You don’t want to fry another set of pistons
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