General Category > General Discussion
700 miles on rebuilt lemans engine and possible oil issue
amamet:
rebuilt the engine on my 77 lemans approx 700 miles ago. gilardoni cylinders and heads redone. been noticing the plug on the right has been a bit darker and rich. im using individual choke levers as opposed to the singular cable and lever style. runs good, hard to start occasionally from what I assumed is the rich plug, left is a nice brown color.
what's really concerning me is when I look through the spark plug hole and the left is dry and still appears dull grey metal but the right one has a bunch of dark build up on it and appears slightly oily and shiny. rubbed a tip on it and came out a little oily.
just wondering what I need to do at this point? take heads off and examine pistons unobstuctred? I have an auto zone compression tester I can use incase of bad ring run in
thanks and all help is appreciated
Allen
Old Jock:
I would run a leak down test to see what results I got from both sides.
If that's not possible perhaps a compression test "might" show something
Got one of these remote visual inspection testers to get a better look at the piston?
I wouldn't tear into it just yet.
Have the carbs and fuel enrichers (choke) been overhauled?
Could be on of them is stuck or running rich and that's the problem
I'm not mechanic but had something similar on a Sport that was ring gap stupidity (2 ring gaps lined up perfectly) coupled with a cylinder bore outta spec.
In that case I was getting oil leaks on the bottom end due to presurization and small amounts of oil the throttle bodies.
I've also seen stuck "chokes" I think the carbs enrich the fuel rather than choke the airflow
Wiser heads should be along soon
amamet:
carbs are rebuilt, chokes are fully seated. plug threads have a slight sheen to them, a little oil maybe. its the top of the pistons that are bothering me. hard to see anything through plug hole but what I do see is a little build up and a possibly shiny, wet surface whereas the left is dry and dull grey metal
czakky82:
Accelerator pumps?
Have the carbs been balanced?
Does it have an airbox? Oil in airbox could show worn/issues with rings.
Do you engine brake hard?
dxhall:
How did you balance the carbs?
I start by measuring the gap at the bottom of the slide with the butt end of drill bits.
After setting the slides equally with the drill bits, I check balance with a gauge - I use a Harmonizer, but there are lots of others out there. If the gauge shows imbalance, with the slides set equally, something is wrong. Most common causes of imbalance are air leaks in the rubber manifold (I once bought a bike with one of the manifolds installed backwards) or poor seating of the valves. There are obviously other (and more serious) causes of imbalance.
Good luck. I wouldn’t take it apart without further testing.
Navigation
[0] Message Index
[#] Next page
Go to full version