Hi guys, motor ran great over last few weeks but now can be difficult to start after warm up. Also noted at higher rpm it appears to get sudden bursts of power. I thought dirty fuel or carb problem. Cleaned fuel filter and ran sea foam through carbs, no real difference. I don't know the history of the motor but I believe it was rebuilt at some stage, it's too clean not to have been. Compression on all 4 cylinders is within 10psi of each other at around 120psi. What I have noticed is oil/gas seeping from behind one set of carbs... see attached photo. Im not exactly sure where it's coming from but I noticed the bolt securing the gear and throttle linkage arms (probably not the correct term) was loose and the oil/gas seepage is just below that or possibly coming from behind the bolt where it goes into the block which is behind the carbs. My question is .... is it possible I'm losing fuel from that lose bolt ? And is this what's causing he spurts of power at higher rpm ?
The motor also takes a while to build up speed or sometimes it's as if there is a delay once you push throttle forward. I'm hoping it's just this loose bolt as I've found other connections loose (electrical)
It was idling fine but now it's iratic and cuts out, does the same at speed also.
Any help would be appreciated.
I plan on doing a carb rebuild over the winter but would like to get the rest of the summer out of it as it is if possible.
Thanks.
The motor also takes a while to build up speed or sometimes it's as if there is a delay once you push throttle forward. I'm hoping it's just this loose bolt as I've found other connections loose (electrical)
It was idling fine but now it's iratic and cuts out, does the same at speed also.
Any help would be appreciated.
I plan on doing a carb rebuild over the winter but would like to get the rest of the summer out of it as it is if possible.
Thanks.