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| Pie-Roe |
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Pie-Roe
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Joined: 05 Feb 2007
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 Posted: 18:04 - 12 Jul 2009  Post subject: Fuelling |
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I just bought the CCM 644 advertised by Jenks.
Basically the fuelling is shot. I'm just going to put it out there that I don't know much about how a carb works, I'm more of a brakes, wiring and suspension home mechanic, anything inside a carb or an engine is unknown to me.
Right. With the standard can on, the bike backfires a lot and splutters, crack open the throttle in first gear, should in theory throw the front up in the air, but it kind of hits a brick wall.
Jenks said to me when he sold it that it had been jetted for an aftermarket, but he had no idea to what or for what. So I stuck the aftermarket slipon can on, and the performance is better, but still horribly out. The interesting thing about the slip on can, is that it backfires on every stroke on the overrun. I noticed it does it less with half choke, and only the occasional bang with full choke.
I'm giving it to my friend who is an apprentice mechanic to take the carb apart and have a look, but I just wondered if anyone could explain how I could (firstly understand what they are) fettle with the main jets, pilot jet and mixture screw.
Cheers
Pyro
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| Vincent |
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Vincent
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| Vincent |
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Vincent
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| Posted: 18:25 - 12 Jul 2009 Post subject: Re: Fuelling |
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| pyroforlife wrote: | I just wondered if anyone could explain how I could (firstly understand what they are) fettle with the main jets, pilot jet and mixture screw.
Cheers
Pyro |
It's fairly simple - the engine needs the correct mixture of fuel and air to run at it's optimum. As you open the throttle, the main jet needle starts to lift up from the main jet tube, before it reaches the brim of the emulsion tube, into which the man jet is screwed, the engine will be sucking in a fuel/air mixture through the pilot jet, once the throttle is opened a bit more, the main jet comes into play and larger amounts of fuel and air get sucked into the engine. The more fuel/air, the bigger the bang and the more the engine will want to rev. if you can imagine a bigger bang in the cylinder, it's going to make the piston slide down the barrel quicker - thus more revs. as you shut the throttle, the man jet needle slides back into the emulsion tube and the bike will run off the pilot jet again.
fuel/air ratio is very important to how the mixture burns, if you have too much of either, the bike will run less proficianltly,(worser). A dyno will tell the operator how well the fuel/air mix is burning and he can then adjust the jets or the carb to suit.
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| Pie-Roe |
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Pie-Roe
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| Posted: 21:03 - 12 Jul 2009 Post subject: |
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| CHR15 wrote: | why not just buy a new, standard pilot and main jet, fit them, set the pilot screw to standard and go from there. |
This is the overall plan, however I've only had the bike since thursday, and only ridden it about 100 miles, mostly commuting.
Pyro
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Previous: GSF600, FZR600 x2, ZXR750, XT600 Tenere, CB125, CZ125, ETZ 250, ER5, CCM R30, DRZ400, RF600x4, RF900x2, GS500, VTR1000F, 640 SMC, CB250 NIGHTHAWK, GT550x3, GPX750 TE610, CB500, X11x2, SV650, ZING 125, TL1000R,CB250 Superdream, CBR1100XX |
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| Ariel Badger |
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Ariel Badger
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Old Thread Alert!
The last post was made 14 years, 292 days ago. Instead of replying here, would creating a new thread be more useful? |
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