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Jun 17, 2013 17:17:43 GMT
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Hi wonder if anyone can help, and tell me where the main jets are on a set of cbr600 carbs. I'm in the process of making the manifold up but I understand these jets need to be made bigger before fitting them up. Cheers in advance
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Jun 17, 2013 17:27:45 GMT
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Sorry if this is obvious but its the main jet in the bottom of the carb when you take the bowl off. You can't just make tham bigger randomly though you've got to know where to start from, new jets used to be about a pound (prices may have changed) but you can solder them up and carefully drill them out by hand with the appropriate sized drill if you are tight.
Needles and emulsion tubes are probably going to be wrong as well, have got no idea what you would do with those - you'de really need a rolling road.
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Jun 17, 2013 20:18:27 GMT
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i take it you are fitting them on a 1.8 m10 engine??
if so i would start at 170 main jet (drill them to 1.7mm) and put the needles down one and a half clips
this is a very basic guess but is where i would start the only way of getting them correct is putting the car on a dyno..
if they are early carbs they may be fixed needles but there is sometimes a white spacer under them that you can remove..
si
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Jun 17, 2013 20:18:41 GMT
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i take it you are fitting them on a 1.8 m10 engine??
if so i would start at 170 main jet (drill them to 1.7mm) and put the needles down one and a half clips
this is a very basic guess but is where i would start the only way of getting them correct is putting the car on a dyno..
if they are early carbs they may be fixed needles but there is sometimes a white spacer under them that you can remove..
si
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Jun 17, 2013 21:26:23 GMT
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On a 1.6 m10 mate they're going on you reckon they'll be ok hand drilled out then? Cheers for the replies!
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Kieran
Posted a lot
Posts: 1,092
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Jun 17, 2013 21:33:36 GMT
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I have run bike carbs a few times.
Drill the main jet to about 4.5x the choke size (ie 36mm carbs, drill to 1.6mm.
Lift the needle as high as you can if it has adjustable circlips. If not use a couple of washers.
Turn needle jets out 1.5 turns from fully seated.
This should be enough to get it running reasonably well.
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Jun 17, 2013 21:47:53 GMT
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On a 1.6 m10 mate they're going on you reckon they'll be ok hand drilled out then? Cheers for the replies! Yes they will be fine hand drilled put drill bit in vice and turn jet n it with your fingers.. ive done this several hundreds of times and it will work fine.. I love setting up bike carbs.. Si |
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Jun 18, 2013 10:39:32 GMT
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Cheers for all the replies! You're not local to me are you si? Ha
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Jun 18, 2013 18:51:34 GMT
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Southwest in wiltshire.. is where I work can sort them on the dyno for you if you are nearby..
Si
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I'm miles away in lancs pAl???
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Carb jet help!!BenzBoy
@benzboy
Club Retro Rides Member 7
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If the jets are about a quid each as dodgerover said, does it not make sense just to buy a few sizes? At least you can go down a size if it's too rich then. Bogg Bros are well known for their bike carb expertise, might be worth contacting them? I'm sure they can provide jets etc with some expert advice. |
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