SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
K2-K6:
If you're comfortable with checking the clutch, then it's not much different to pull (actually easier) the alternator cover off and try to assess crankshaft movement just by turning the rotor with you hands and a rag wrapped round it.
Some oil will drain out but not much, just residual.
Also in the interests of investigative examinations, could be worth removing the float bowls and trying to gently blow, mouth? Not compressor, down the overflow tube to see if any are blocked which would cause the fuel to exit via jets into carb throat. It may illuminate which cylinder the fuel was routed through.
Which area of Hampshire are you located?
rosco:
Have you tried to turn it over in each gear to eliminate the box If all ok and engine won't turn on either kick start or button likely to be engine locked up Agree with Roy best to take engine out to investigate First check cam chain ok
PJM47:
Ok ta, will whip the alternator cover off and have a look tomorrow. All gears seem ok. Haven’t investigated the carb problem yet as this will be minor compared to the damage it’s caused. probably one iof the overflow pipes blocked which in combination with a leaking float needle and leaving the fuel on ended in disaster. I’m in PO8 area of Hampshire. No hurry to get this fixed, probably an over winter job and I don’t mind paying a reasonable amount or supplying as much tea/beer/bacon as needed. It is (or was) a nice bike.
K2-K6:
--- Quote from: rosco on September 01, 2020, 06:52:50 PM ---Have you tried to turn it over in each gear to eliminate the box If all ok and engine won't turn on either kick start or button likely to be engine locked up Agree with Roy best to take engine out to investigate First check cam chain ok
--- End quote ---
The kickstart engages a gear directly on the clutch basket, which in turn is directly connected via spline drive to the primary chain coming from the crankshaft. By removing the clutch plates the gear ratios have no connection at all with the engine / crankshaft assembly.
The OP should be able to turn the centre shaft of the clutch (rotaing the gearbox) and demonstrating it's free, but not the clutch outer basket as it's still directly connect to crankshaft.
PJM47:
Yeah inner of clutch is free outer is stuck. No movement at all at the alternator it’s locked completely solid.
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