Johnj wrote:Oh ya, the VF500C has that little bitty aux tank under the seat. Do not use a pump designed for fuel injection. Does your pump flow the required volume of fuel?
Yes but I am going to retest today to confirm volume--my last test was done with the engine running fuel line off carbs--today will run test following manuel instructions--jump relay--turn key on--should deliver 0.74qts--test is for 10sec times 6=1min=0.74qts plus or minus 0.10
With engine running I got 4oz x 6=24oz=3/4ths of a quart--right? so it passes--I want to retest using book method to see if I get the same results. This test method is much more difficult cause the relay is hidden in there--hard to get to--my reason for testing by simply removing fuel line and run engine with float bowl fuel.
If the fuel pump passes again--Im back to square one with my problem of crapping out at 6 to 7thou rpm's.
Let me run this next idear by you--one of my coils had a crack in it along its side--I put rtv over it to keep moisture and dirt out--if this coil is weak--could it be causing the crapping??
A bit of history so we don't backtrack too much--carbs off 3 times cleaning and making sure the sliders are working right and diaphrams checked for tears or holes-- set in there grove--new boots--carbs put on engine all the way seated and boots tight and tested for leaks--air cleaner cleaned and oiled with proper oil (K&N clean kit)--new njk plugs--engine oil and filter new--checked tire pressure (joke--ha--ha)--sync carbs with mecury manometer (all four are near perfect after painful messing with butterfly's--hard to reach until my neighbor let me use his 45 degree super screwdriver with a twist tube thingee)--bike will haul butt if I change gears around 5 to 6thou rpm's--cruises fine under 6 and reaches 55 to 60mph at 5thou. With the tac at 5 to 6 thou and speed at 55 or 60 mph and I open the throttle up--thats when the crapping starts. A thought just happened--maybe I need to downshift a couple of gears before opening her up??? Mabee it is simply lugging??? Have to try this.