stalling when rolling on the throttle (carbed 900)?

junior varsity · March 04, 2010, 02:37:49 PM

not yet

ducpainter · March 04, 2010, 02:40:22 PM

Quote from: ato memphis on March 04, 2010, 02:37:49 PM
not yet

humor an old fossil...

I won't live forever you know.

junior varsity · March 04, 2010, 02:45:08 PM

its going to have to wait an hour or so before I can tinker again (i'd like things to cool down a smidge before I cook a hand on the motor), the wife is deadset on a pizza pie for dinner.

ducpainter · March 04, 2010, 03:02:59 PM

Quote from: ato memphis on March 04, 2010, 02:45:08 PM
its going to have to wait an hour or so before I can tinker again (i'd like things to cool down a smidge before I cook a hand on the motor), the wife is deadset on a pizza pie for dinner.

good thing I'm eating steak right now or I'd be jealous.

junior varsity · March 04, 2010, 03:03:40 PM

curses, steak!

junior varsity · March 05, 2010, 05:55:25 AM

Through a bit of seafoam in the tank to see if that could cure some bad gas... Got out there a bit this morning, revs fine for quite a long time, up and down the range, feeling good. Engine temp got to over 80c and things were going good for awhile (I had a fan blowing across it so it wouldn't get much hotter), but then a few minutes later, as I cracked the throttle open it was having trouble running and backfired a lot, all the way up to 5k or so. shortly after that I couldn't get it to rev up any further and it would die as I tried.

64duc · March 05, 2010, 08:22:25 AM

Could also be worn needles causing fouled plugs. Pull a spark plug and look at the color. Brown or tan = good Black = bad

greenmonster · March 05, 2010, 09:14:37 AM

QuoteWhile it was idling, i was checking all my lights and discovered I had forgotten to plug in the front brake switch. no big deal. Plugged it in, went to rev again, and in doing so, it sputtered as I got to about 3k and now it'll die when i try to rev it past there.

Check wiring around steering head.
Isolation often wears through, causing misfire, sudden death etc.

Does the fault occur on sidestand & just revving?

junior varsity · March 05, 2010, 10:10:44 AM

on rearstand, happens after bike has been running for 10min or more... Once its gotten good and warm.

Could be fuel starvation rather than flooding I believe. Cory at the shop asked me to see if I had a leak in the intake tract. Gonna look into that.

Punx Clever · March 05, 2010, 10:20:12 AM

Do you smell gas in the exhaust? Plugs fouled/fouling? If no, then starvation.

junior varsity · March 05, 2010, 05:38:37 PM

Played a little more today. Seems like it is starved for fuel, rather than flooding as I had originally thought - I'm not sure why I smelled gas the first time, perhaps it was my own? (bad joke.)

From my research, it looks like common problems come from heat/age with both the fuel lines and fuel pump. I'm going to try swapping 'em to see if that's the issue.

svr · March 08, 2010, 08:54:04 AM

any updates here? i'm in the middle of changing fuel lines, filter, going to a manual petcock and just rebuild my fuel pump so i wanna keep up with how yours is going.

junior varsity · March 08, 2010, 01:05:03 PM

waitin' on fuel pump to test (it has shipped, should be here any day now)

alibaba · March 08, 2010, 07:43:21 PM

Don't know much about these modern bikes, but on my old Brit Iron, this problem was symptomatic of 2 things. A condenser breaking down under heat - which is obviated on these technological marvels - or - a clogged vent in the gas filler cap. (Too much wax.) Now, I don't know if this makes any sense with a fuel pump but suspect an unvented tank might lead to fuel starvation. Vent hose crimped someplace?

junior varsity · March 09, 2010, 04:07:12 AM

i'll check those vents out for sure.

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stalling when rolling on the throttle (carbed 900)?