SOHC.co.uk Forums > CB350/400
CB400F Frustrations - Not firing, low compression (Cyl Block now off)
mike the bike:
The LH points (blue) power plugs 1 and 4. RH points (yellow) power 2 and 3.
Considering 1,4 for a moment...
When the points open, the coil for 1 and 4 should make a spark. This should occur when F1,4 shows through the timing hole in the points plate.
Once 1, 4 is timed, then do 2,3 as it's on a sub plate.
If and when you get it going, beg or borrow a strobe light to get it spot on.
ManicGTI:
Thanks, intended to have another look this weekend but haven't had the time I need!
Float heights- I did set these, and redid after changing the float valves. I'll recheck, hopefully the leaking one was just a mess up on my part.
Choke- Yes, used the choke, tried in all sorts of state of throttle and choke.
Emulsion tubes- Yes, pulled and cleaned it all. Having said that, I'm inclined to pull the carbs and go over them again to be sure. A colleague at work has suggested I use the full rebuild kit, despite they're rep for not being great quality it should get it running and can always swap back in the OEM parts afterwards.
ManicGTI:
Adaptor for compression tester has just arrived, so I'll get on that and check the points timing.
Nurse Julie:
--- Quote from: ManicGTI on May 03, 2015, 09:41:20 AM ---Thanks, intended to have another look this weekend but haven't had the time I need!
Float heights- I did set these, and redid after changing the float valves. I'll recheck, hopefully the leaking one was just a mess up on my part.
Choke- Yes, used the choke, tried in all sorts of state of throttle and choke.
Emulsion tubes- Yes, pulled and cleaned it all. Having said that, I'm inclined to pull the carbs and go over them again to be sure. A colleague at work has suggested I use the full rebuild kit, despite they're rep for not being great quality it should get it running and can always swap back in the OEM parts afterwards.
--- End quote ---
I wouldn't dismiss using the Cruzinimage carb kits due to low price. I replaced all the bits in my 400 carbs a few weeks ago with the Cruzinimage ones and the carbs are working beautifully
Bryanj:
Before you do a total strip spray a small amount of ether or "Easy Start" into the airbox and see if it coughs, if yes its carbs or settings if not its electrical. NOTE THE EMPHASIS IS ON SMALL
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