SOHC.co.uk Forums > CB750
Pressure gage tripping after 15min ride
philward:
Hi
Some input on the jetting for big bore - I'm running a standard compression 836 kit (Cruz Image kit from Japan) on std airbox/exhausts (on my K2) and plugs a nice sandy colour on 110 main 40 and 1 1/4 air screws. Needles are on middle setting. It runs great throughout range (not revved it hard yet as only done 400 miles). Only thing out of the ordinary is it only needs 3/4 choke when starting from cold and needs backing off almost immediately.
Phil
royhall:
How is the old girl Phil. Not heard about it for quite a while.
Sent from my Nexus 7 using Tapatalk
philward:
Roy
She's Great! Done about 400 miles and no issues at all except those soggy old springs mentioned in other post. Have sent for a set of progressive springs. She's slower than I remember but that's probably because I'm stepping off a ZZR1100! It's very smooth and I enjoy driving it slow or around town as it's a light weight compared to the ZZR. Only other issue is front rim is slightly out of true but I'll get that sorted with the guy who built the wheels this winter.
Considering I built it from scratch I've had no teething problems - so well chuffed!
Phil
Trigger:
Sounds like the K2 is running sweet Phil, plug colour is always a good sign.
mgy66:
Good to know...
@Totty, Definitely within the 90c to 110c, rather lower bound, semi synthetic oil, traffic jam / commute in town with loads of stop and start at red light. So could come from the oil pressure gage or may worth upgrading the oil to higher viscosity. My worry is really that the pressure drop would result in engine failure or bearing failures...
@Philward, I am not so far of in spec, only running 105 main and needles seems fully engage so will double check that again. I have noticed gap at opening the throttle which seems to indicate lean mixture. Yet my plugs are really black. Will take a picture and share the colour. What would be the result of miving the needles up? Richer i suspect which is what i want to avoid
Thanks
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