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Post by zambia on Jun 26, 2014 23:02:01 GMT -5
Well, first of all - I apologize for asking dumb questions and secondly thanks for all the suggestions. Thinking again it must be the carb seal, I took them off again and smeared a little Vaseline on the carb throat. That pretty much cured the lean idle (I feel like a dumbass, but was happy with the result). The air screws are backed out to one turn now and I can probably go a bit more. The only remaining issue is the 3-4K four stroking at 1/8th throttle. Did a few WOT rips out in the country tonight and it feels pretty good. The plugs look fine.
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Post by Walms on Jun 27, 2014 5:46:22 GMT -5
You know what they say, no such thing as a dumb question! Glad you got it sorted! Actually because I got the same warning, my plan is to keep jetting up until I get a good burble at WFO and then back off one jet size. It's amazing the difference a pipe can make, with my other pipes, the max I was able to pull was a 160 main, I'm at 170 now and just ordered jets to 180!
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Post by kawonda750 on Jun 27, 2014 8:33:52 GMT -5
Since we're asking dumb questions, I may as well add to the idiocy. Are we counting one size as 5 or 2.5? I see that mains come in 100, 102.5 and 105 now. I seem to only remember the 5 increments.
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Post by Walms on Jun 27, 2014 8:40:06 GMT -5
160 to 170 = 4 sizes... The way I look at it.
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Post by JA-Moo on Jun 27, 2014 9:59:04 GMT -5
Mikuni goes by 2.5 up to 140 or something then by 5's on the roundheads, and hex go by 10's
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Post by Walms on Jun 27, 2014 10:09:36 GMT -5
My turn... Is there any rhyme or reason to the numbering system? Let's say you had a set of Keihins and you wanted to install a set of Mikuni's, is there a comparator chart to get it in the ball part for flow?
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Post by JA-Moo on Jun 27, 2014 11:01:19 GMT -5
There should be one somewhere. I have seen the round VS hex mikuni chart.
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Post by zambia on Jun 27, 2014 11:52:25 GMT -5
There should be one somewhere. I have seen the round VS hex mikuni chart. Even the round vs hex one is weird. We call the round jets "reverse" because flow is measured going backwards through the jet (cc's per minute)...whereas hex jets are numbered according to the diameter of the hole (I think). I read somewhere that you can use Mikuni jets in Kehien carbs?
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Post by Walms on Jun 27, 2014 12:13:46 GMT -5
I believe the smaller PWK's use the same mikuni round jets. Another thing that I heard through the grapevine is that the jets are sized according to flow, not the size of the hole through the jet, this is why it's not recommended to drill out jets unless it's the final move you can make to get mobile. Kind of like how they grade bearings, it happens in the QA process after they are made, nothing special in the manufacturing process, just luck nets a precision bearing.
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Post by zambia on Jun 27, 2014 12:21:29 GMT -5
This is a really interesting read - I would love to try the technique out, but it would require a lot of time and a lot of jets (especially for a triple) and your hands would smell like gas ...forever. www.smellofdeath.com/lloydy/jetting.htm
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Post by JA-Moo on Jun 27, 2014 12:42:16 GMT -5
That's actually how one should jet. When jetting, I usually remove the carbs 10 to 20 times....... One thing, you have to use a main jet in the Mikuni's, or the needle jet may come loose, I have a set of jets drilled huge for this test.
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jyrgnorway
2nd Gear
H2B CAFE, H2B, H1B, F8 BISON, Z1000ELR, RD500
Posts: 468
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Post by jyrgnorway on Jun 27, 2014 18:00:22 GMT -5
Mikuni round jets, as in f.ex stock H2 VM30 is measured in diameter of hole. Mikuni Hex jets, as in f.ex VM34 is measured in flow.
A 200 hex jet VM34 is almost same as a 100 round jet VM30........as far as I know.
Jorgen
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Post by Walms on Jun 27, 2014 18:12:18 GMT -5
I'm curious if the hex jets are similar to the Keihins as far as flow goes? What size jets were you using with the Clough pipes John?
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Post by JA-Moo on Jun 28, 2014 2:11:32 GMT -5
Not totally positive, around 250's me thinks......
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Post by Walms on Jun 28, 2014 6:17:48 GMT -5
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