SOHC.co.uk Forums > CB750
CR750 Running (or not running!) issues
philward:
Just got an hour in the garage away from grandkids. I think it's sorted (hopefully!). Tried messing with gradually weakening the mixture on the air screws - no change. Plugs still all wet.
Put the D7 plugs in and started 2nd kick - tinkered with slight adjustment of air screws and seems to be running fine. Will re-time and road test over the next week whenever the roads are dry.
Tried white spirit on NGK plugs that were in and the NGK lettering not coming off so whether they are fakes, just duff or the D7's are just better suited to the setup and change in weather, who knows!
Thanks for all your input guys
Bryanj:
I always found that once wetted/fouled plugs may spark when laid on the head but fail under compression, only cure was the old Champion plug sandblaster.
CR750:
--- Quote from: philward on November 29, 2018, 10:35:40 PM ---I've only been putting half a gallon in at a time as I have been waiting to get the CR replica fuel tap back from the guy who makes them (as it was leaking) and knew I would need to drain the tank. I have a cr250 motocross tap on at the moment (its not a tap issue as I've had that fitted since start up).
--- End quote ---
The only problem with putting small amounts of petrol in the bike & leaving it stood for a while is that it will quickly attract moisture which will sit at the bottom of the tank & the watery fuel will be the 1st thing to fill the float bowls..
but I do understand, you will be emptying the tank to fit the new fuel tap so getting half a gallon out is much quicker than emptying a full tank..
PS.. I use Esso Synergy Supreme + 97 [ No ethanol in this, exceptions for certain areas of the UK ]
https://www.esso.co.uk/fuels-faqs
philward:
I use super unleaded in all my bikes to avoid the thernol related problems - until it gets put in that too!
Seemed to have sorted problem (see previous post) - duff plugs.
CR750:
--- Quote from: philward on December 02, 2018, 12:10:06 PM ---I use super unleaded in all my bikes to avoid the thernol related problems - until it gets put in that too!
Seemed to have sorted problem (see previous post) - duff plugs.
--- End quote ---
Glad to hear you have sorted it !
The only super unleaded that has no ethanol added is Esso Synergy Supreme, all the other brands "Shell" "BP" etc all have ethanol added, usually 10% & this is going to increase... >:(
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