SOHC.co.uk Forums > CB350/400
I think the slides are in the wrong bodies
TrickyMicky:
Re. swapping the plug leads about, No 1 and No 4 share the same coil and points. Likewise, Not. 2 and 3 share the same coil and points. If you put the HT lead from 4 onto 3 it will spark on the wrong stroke. This also applies if you swap 1 and 2 over. Lift your petrol tank and check which leads are going to which plugs, plus to reassure yourself, make sure the low tension leads are connected correctly from the coils to the relevant points. You mention that when you put No. 4 lead onto No. 3 plug the exhaust then got hot. Is there a chance that it was incorrectly fitted in the first place? Have fun, it's a great hobby for keeping the old grey matter active. Mike.
Eldrick:
--- Quote from: TrickyMicky on September 23, 2022, 01:27:30 PM ---You mention that when you put No. 4 lead onto No. 3 plug the exhaust then got hot. Is there a chance that it was incorrectly fitted in the first place? Have fun, it's a great hobby for keeping the old grey matter active. Mike.
--- End quote ---
I don't think so, since the spark is is 'a redundant spark' I expected it to 'work' at the other end of the stroke to at least prove the fuel is getting through. So I think the leads aare all in the correct order. I just swapped them as a logical elimination step.
I will take the tank off again, tomorrow, and follow the leads to make sure they are #1and#4 and #2and#3.. If they aare not, then it needs new cables as they are not reaching anywhere else.
PS, I am having a good time doing this and learning.
kevski:
--- Quote from: Eldrick on September 23, 2022, 02:04:29 PM ---
--- Quote from: TrickyMicky on September 23, 2022, 01:27:30 PM ---You mention that when you put No. 4 lead onto No. 3 plug the exhaust then got hot. Is there a chance that it was incorrectly fitted in the first place? Have fun, it's a great hobby for keeping the old grey matter active. Mike.
--- End quote ---
I don't think so, since the spark is is 'a redundant spark' I expected it to 'work' at the other end of the stroke to at least prove the fuel is getting through. So I think the leads aare all in the correct order. I just swapped them as a logical elimination step.
I will take the tank off again, tomorrow, and follow the leads to make sure they are #1and#4 and #2and#3.. If they aare not, then it needs new cables as they are not reaching anywhere else.
PS, I am having a good time doing this and learning.
--- End quote ---
if 3 out of four are heating up your leads are on correctly, valve time and ignition timing will be correct, I would look at valve clearances on suspect cylinder then do a leak down test, as well as swapping leads 2 and 3.
McCabe-Thiele (Ted):
If you are running on original coils I would certainly check where the lead comes out of the coil they seem to have issues there when the insulation rots separating from the central core. My 500 was very prone to misfire on one cylinder 1. When I fitted some inexpensive aftermarket coils it started immediately not much cranking needed as before.
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