Thread: Does this look too lean?
06-29-2009, 09:52 PM #1
Does this look too lean?
Ok, this is after about 7-8 hours on the rebuild. These pics were taken after about 3 consecutive 40ish second WOT runs. I already have the jettings pretty rich (don't remember exactly what they were), to the point where my wash should definitely be on the rich side. As long as I'm not in the danger zone I'm fine with it, but I dont really know.
While running, it seems like the PTO is cool, the center is fairly cool, and the mag is kinda warm.
06-29-2009, 11:04 PM #2
Yes. All of them look lean.
06-30-2009, 03:53 AM #3
I agree. Also, without a super closeup and judging only by those pictures, the center looks as though you may be starting to have some damage. It may be just that picture though.
06-30-2009, 08:57 AM #4
06-30-2009, 10:49 AM #5
i'd start looking at fuel delivery,if i remember what you said you were running for jets it looks more like your just not getting enough fuel with enough pressure to the carbs,time for a pressure guage to check the return pressure.you have to hook it up between the pto carb return and the feed for the center carb to check
06-30-2009, 03:22 PM #6
06-30-2009, 03:30 PM #7
the center carb doesn't have a body mounted pump,its feed by the returns off the mag and pto.you need to install a tee in the line from the pto return to the cen carb v inlet.then connect your gauge to one end of the tee.my virage runs about 4-4.5 psi at wot
06-30-2009, 03:47 PM #8
06-30-2009, 08:18 PM #9
- Join Date
- May 2008
The pistons appear to be awfly loose in the jugs to me. They knock around a lot more than I would expect. And there was slight damage on at least one of the pistons before this rebuild, so you can disregard that.
Someone who is recomended on here bored the cyls with the pistons in hand, so I would expect it to be good... But I know my pistons fit a lot tighter than that, and theyre OEM bore.
Also, these pics are at about 8 to 9/10 throttle. The throttle cable was loose and it wasnt hitting full WOT.
07-01-2009, 11:23 AM #10
Ok, I just picked up a fuel pressure gauge. I hooked it up on the carb fuel line that goes between the pto and the cen cylinders. At idle I have 2 psi. When I throw it to WOT, the pressure spikes up slightly past 4, and then comes back down to 3psi while holding WOT. So, I'm assuming this is probably where my problem lies. I'm going to go out, bypass the waterseparator, and fuel switch and see what I get for pressure.
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