SOHC.co.uk Forums > CB350/400
Bike over heating after 40 mile ride
Ken4004:
https://youtube.com/shorts/fo1BwZChoxk?si=zYPBbhgGbNOJM228
Bike carbs sync these don’t look bad to me they were well out but not surprising as I had the carbs apart
Ken4004:
Everything set up again today so just to recap :-
The fuel cap breather is working correctly
The oil filter and oil strainer are clean
The spark plugs look gaps are correct
The timing has been reset and checked with a timing light
The advance mechanism is moving freely and advancing the timing when revel up.
Carbs have been balanced with pro tune
The fuel is flowing freely from tank, removed fuel Tap a cleaned filter just a few bits on the filter.
Bike starts straight away and idles nicely at 1200 rpm
Bike revs up to 6000 freely ( haven’t gone past that as still running in) when not in gear
Wife has been very patient with me so need to get reading for our holiday so that’s it till I get back in a couple of weeks.
Jobs to do
Remove spark plugs and clean with a blow torch to clean up then go out for a run and see how she feels, thanks everyone for your input.
One last thing I think I need some new leads for my coils they are too short on number two cylinder and the spark plugs caps need changing, there is a possibility that I might be getting an occasional misfire on number two cylinder because of the ht leads I think.
Can anyone recommend a new set of coils for my 400 4 that are decent , original coils are ok but leads are moulded in so cannot be changed so ideally I would like some coils that I can change the leads on when they get ropy.
Ken4004:
Alternatively if someone has a set of coils they are not using I could fit them to my bike and modify the originals in slow time
TrickyMicky:
No disrespect, but even when running in, if you do not go above 6000RPM, then you are not doing it any favours, they don't even start breathing properly till about 7000 or 7500, so if you were going uphill in top gear at 6000 or less then, yes, you could overheat as you are virtually labouring it. You mentioned your other bike which is no comparison whatsoever with the 400, which has very small pistons, very oversquare dimensions allied to no flywheel. They do need to be kept spinning at a reasonable rate.
Ken4004:
Hi Tricky that’s a very good point , I didn’t really think about this particular road being an issue but from what I have read on this forum this bike needs to be reved hard so really I wasn’t giving it a chance.
I haven’t wasted my time re running through the set up because things had changed and needed to be tweaked while the bike settled down after the rebuild.
Had a lot of issues fitting the exhaust the first time because it was from another bike but once fitted and heated up it was relatively east to remove and refit.
Next time I go out for a ride I’ll give it some more revs just being over cautious I suppose.
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