June 2, 20179 yr Hi! The needle in the throttle seems to loose to me, but maybe it should be like this? The needle play sideways is around 2 mm in the throttle seat, up and down seems ok but the sideway movement looks to much, I never seen such much play on any other needle/throttle combination before. To me it looks like the hole in the throttle is to big, maybe someone previous owner put in wrong needle? Should it be like this or is something wrong here? Any help appreciated:) Edit: It is the original Amal carb. Edit 2: Should the air filter be oil filled or is it a dry filter? Edited June 2, 20179 yr by stefan_s
June 2, 20179 yr Sounds too loose, but they are usually able to rock a bit in AMALs. What markings are on the needle? If it's a foam filter, it should be oiled. If it's a dry paper element, it should be dry. They normally have a foam filter element The needle is normally held in a hole in the throttle slide. I figure that's what you mean by throttle seat. Edited June 2, 20179 yr by feetupfun improved answer
June 2, 20179 yr the needle is tapered so will always have movement, look down at the needle jet, they (due to movement of the needle) can wear, if there is any ovality to it it is worn and needs replacing
June 2, 20179 yr Check your slide, sadly AMAL uses the same material for the carb body and the slide which results and wear so the slide starts rattling around in the carb and if the slide rattles the needle will do it too. In the end or very soon you have a worn slide and needle and needle jet. There are two fixes to that problem: - a chromed slide for the AMAL or - a different carb. As non of the mentioned fixes are cheap I' am using a Dell'Orto PHBH CS in my 242 with great performance increase. Finally I can now adjust the carb and it really has an effect to the engine, also the fuel consumption is lowered.
June 3, 20179 yr 23 hours ago, stefan_s said: Hi! The needle in the throttle seems to loose to me, but maybe it should be like this? The needle play sideways is around 2 mm in the throttle seat, up and down seems ok but the sideway movement looks to much, I never seen such much play on any other needle/throttle combination before. To me it looks like the hole in the throttle is to big, maybe someone previous owner put in wrong needle? Should it be like this or is something wrong here? Any help appreciated:) Edit: It is the original Amal carb. Edit 2: Should the air filter be oil filled or is it a dry filter? Does not seem a problem, the clip holds the needle, not the slide.The centre hole needs to be big enough for the cable, with its nipple, to pass through. If the carb is worn out, that is a different issue.
June 3, 20179 yr Author Thanks for reply's. I will check the markings on needle. I will check the wear on the slide and body. I have just started it once, but it only run on full choke, if I close choke or open throttle it stalled. Its a foam air filter, so oil it is, but the original filter box is gone . pschrauber, Interesting to hear about the Dell'Orto, does it work well tho whole range, from top to bottom.
June 4, 20179 yr Author The marks on needle is 2B2. Both the slide and body has signs of wear but it dosent look to bad to me. Now I have no spark.
June 4, 20179 yr http://amalcarb.co.uk/mk-ii-concentric-series/2600-series/needles.html sounds like the markings for an AMAL needle This link should take you to parts listings for MK2 AMAL concentrics so you can look to see what needle your carby would normally have
June 4, 20179 yr Author 51 minutes ago, feetupfun said: http://amalcarb.co.uk/mk-ii-concentric-series/2600-series/needles.html sounds like the markings for an AMAL needle This link should take you to parts listings for MK2 AMAL concentrics so you can look to see what needle your carby would normally have Thanks for the link Got spark again after changing to new plug. Was able to take it for a small run but carb is flooding so i need to sort that.
June 6, 20179 yr Before you replace all bit's look up the overall costs and compare with other possibilities.
June 7, 20179 yr Author 20 hours ago, pschrauber said: Before you replace all bit's look up the overall costs and compare with other possibilities. If I go the Dell'Orto way like you did, what size nozzles and needle do you use? And is there any guide around how to setup the Dell'Orto PHBH CS? Regards Stefan
June 7, 20179 yr Quote Dell'Orto PHBH CS 26mm: values for adjustment: See Messenger Edited June 7, 20179 yr by pschrauber
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