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  #11  
Old 28th August 2017
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Ferrous Head Ferrous Head is offline
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Quote:
Think that I will get the whole setup clean and into spec and get the motorcycle on a Dyno.
That is the only serious way to sort out carburation. Every thing else is just guess work. And after nearly 50 years of working on engine I suspect that my "guesses|" are better than a lot of others with less experience.
But for my bikes, I don't guess.
I have a torque wrench.It measure she amount of torque that I apply to my bolts. (well, actually I have 3 of them but that's another story)
I can pretty well feel 65 Ft Lbs. I've been torquing them down for a long rime now.
But I still don't guess. I use the torque wrench.
Because if I don;t, I'm really just "guessing".
And down that path lies madness.
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  #12  
Old 28th August 2017
Mad Max Mad Max is offline
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So if the pistons look okay, I can let the cylinders honed put new rings in and not replace the pistons?
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  #13  
Old 28th August 2017
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Good mechanics do two things really well.
They clean and they measure.
As long as your bores are within limits and the pistons aren't showing major wear then yes, just hone, new rings and go.

Bear in mind I once made a Vespa run using a cardboard head gasket I made myself. That was to win a bet. Not my normal ride.
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  #14  
Old 28th August 2017
Indian Joe Indian Joe is offline
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Your spark plugs will tell the story. My Mikuni 38 VM cost me a $ 100.00 off E Bay minus the throttle cable and air cleaner. How are you " reading " the " overall " mixture " ?
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  #15  
Old 28th August 2017
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The same way. By reading the spark plugs.
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  #16  
Old 28th August 2017
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Oh, now you got to buy four spark plugs at a time! Maybe you could post a picture(s) of the four spark plugs. I am very interested in seeing the " colors" , if they burn ( heat ) the same color or maybe the front ( on the same head ) requires a differ heat range. Being the front plug sits right next to the exhaust valve, I wonder if a colder spark plug is required?
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  #17  
Old 28th August 2017
MXHD55U MXHD55U is offline
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Yea, you can keep buying plugs or fix the problem. plenty of bikes running Mikuni's with out dual plugs that run correctly. no reason your can't either.

it's kinda like considering doing a heart transplant when the patient came in with a cold. don't do more then you need and correct the problem don't add to your confusion.

a review of the jetting you are running in the carb (it' a VM 38 Mikuni I'm assuming) what air cleaner along with the plugs photos would surly get you a long ways towards correct info from this group. couple of pretty sharp cookies here ( ok and plenty of hear transplanters too)
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  #18  
Old 28th August 2017
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I would be loathe to ever give an opinion on carburation based on someone's picture of plugs.
9% of people do not do a correct plug chop to start with so no reading will ever be correct.

I am absolutely sure more than a few people here run VM Mic's and will know what the baseline jetting should be. If the engine is basically stock the jetting from another basically stock bike will be very close.
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Old 28th August 2017
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I don't mind at all. I want to see if it actually fuel or is it oil that is fouling the plugs. and if fuel just how sooty are they? I went thru this with someone else recently and he was operating the enricher (some mislabel as a choke) backwards. It's all about trying to eliminate possibilities isn't it?
Since none of us have the luxury of wandering over to his abode to glance over his shoulder this will have to suffice for this edition of why does my bike run like it do?
mean while if he has installed the correct jetting, right slide cut away and doesn't have something hideously restrictive device purporting to be an air cleaner we can get closer to determining why something this simple is vexing this individual . It really isn't rocket science, you simple follow the proven formula. It's all over the internet including this forum's stickies. It's like following a map. stick to the route and arrive at the destination like everyone else.
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  #20  
Old 28th August 2017
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Generally speaking, too rich gives a black sooty appearance. A flat black. Excess oil has a shiny look.
But I believe the man is very correct in wanting to put his bike on the dyno to get actual real world measurements on what his particular engine is doing.
The dyno can point out problems that really can't be seen any other way.
The reason virtually all carburetors have adjustable jets is that no two engines are ever exactly the same. Otherwise they could have fixed jets for stock bikes.
And once you start doing ANY modifications to an engine everything changes.

It's just good that some people are willing to find out as much as they can and are willing to try to optomise their engine.
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