Wildguzzi.com
General Category => General Discussion => Topic started by: wirespokes on May 29, 2024, 08:58:54 AM
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I picked up a project bike that had been restored. Well, sort of. It looks pretty good, but some of the work was questionable.
I'm getting close to firing her up and in checking valve lash yesterday I noticed the plugs were pretty black. Carbon. Quite a few of my bikes have required jetting changes - including the LM3 that came from new with the exact correct jetting. A PO had changed the jetting who knows why.
Anyway, I've heard discussions that the larger carbs are totally unnecessary, yet Richardson has the view that these bikes can always benefit from bigger carbs. Some have said there will be poor performance and worse mileage with the larger carbs. I don't believe that and figure they just didn't get it jetted properly.
In my experience, a liter bike should get 45-50 mpg with snappy performance. Many times I've started with bikes that got high 30s to low 40s and were sluggish. Once the jetting was right, mileage went up considerably along with performance. It's a bit of a long drawn out process, so hopefully some of you have already sorted this one out. What worked for you? Give me a baseline to get most of the way there.
I've been thinking of trying the jetting for the LM3 or LM4. But they both have the main jet shroud and behave differently.
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I’m interested in same details as well. I’ve been working on assembling a pair of 36’s for my CX as well.
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My CX has 140 main jets, 60 pilot jets and #50 slide.
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My CX has 140 main jets, 60 pilot jets and #50 slide.
That's with PHF 36s?
What sort of mileage do you get?
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I like 36 PHF carbs. They are great on square fin big blocks. I always seem to run K-3 needles,265AB atomizer, around 50 to 60 idle jets, 65 or 70 choke jets, 603 slides and 135 to 145 main jets. For small blocks ,I have 30 PHF’s on a V65C but don’t remember what I have in there but I bet it’s roughly the same except maybe 503 slides.
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That's with PHF 36s?
What sort of mileage do you get?
That’s with PHF36’s and I never had the heads ported. No idea on the mileage.