Russ Henry
Husqvarna
AA Class
Coolant is the first thing we checked. Was fine.
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Hi everyone,
As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.
When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.
Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.
Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.
Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.
Thanks for your patience and support!
Need help! 449 started to run crappy today.
- Thread starter Russ Henry
- Start date
Husqvarna
Tinken
Husqvarna
Pro Class
Interesting, I had thought about the sensor, but I did not think it would cause the leaning symptoms.
Russ Henry
Husqvarna
AA Class
Could having the air screw turned out more than 2 1/2 times do it ?
Sounds like these guys are right on. Could be a dirty injector but seems odd it would idle and run wide open but not int he mid. Temp sensor might be it but usually they don't like to start and idle with a bad temp sensor. Do you have a JD tuner on this? Yes? Maybe try bypassing it back to stock to eliminate that from the equation? I have seen VERY little failure rate but when you chasing a ghost you need to eliminate the EZ things first. I take it it has ran fine for several rides since riding it with no coolant at the gathering? And yes, i run some Berryman fuel injection cleaner in mine. also a splash of seafoam once in a while.
Russ Henry
Husqvarna
AA Class
The bike has ran great except for Bend. That was just a coolant issue. I rode Saturday and it ran great all day. Sunday to about 10 miles then it crapped out. I just remembered that I did turn the air screw out another turn on Sunday. Is to much air the reason ?
I would not think so.
Tinken
Husqvarna
Pro Class
The reason I thought it was a dirty injector is because it only runs at higher throttle %'s (at the lower %'s it is leaning out). As you increase your throttle, pump psi climbs. If the injector was dirty then the fuel would be slowly diminished. At the same time, this could be caused by a fuel pump going out. When racing, we change out the fuel pumps at certain time intervals because they do wear or clog over time.
KTMs are having all sorts of pump issue with clogging due to tank manufacturing slag.
OlderHuskyRider
Husqvarna
Pro Class
With a mechanical, 45 lb pressure regulator (45 on mine at least, tested) how can increased revs increase the pump pressure?
Excellent. That was the first thing I thought of because you seemed to have similar symptoms at Bend last fall.
Personally I would take somewhere and connect an iBeat (or whatever diagnostic tool works for your bike).
Tinken
Husqvarna
Pro Class
Yamaha's too.
Tinken
Husqvarna
Pro Class
That is a good question, looking at the schematics, the 449 show's a pressure regulator, but I have been told that the ecu can vary voltage to the fuel pump to increase/decrease pressure as needed.
OlderHuskyRider
Husqvarna
Pro Class
I haven't looked at the parts diagram, but IF the pressure regulator is downstream from the pump, and IF the regulator is a mechanical spring valve that opens at 45 lbs (like a radiator cap), then no amount of increased voltage could push anything more than 45 lbs past the regulator, it would only increase the amount of gas being shunted out the overflow tube.
Tinken
Husqvarna
Pro Class
True, but on the 449's if the high limit was 48 and pressure was low, the ecu could bring pressure back up to the regulated maximum. It's speculation to me because I haven't torn one down to play with, but I am curious now and will ask Ty when I get to the shop tomorrow.
under the max that the regulator regulates i would guess.
OlderHuskyRider
Husqvarna
Pro Class
Did you turn the air screw to increase a declining idle speed? What happened with the coolant? Did you overheat? Do you run a higher PSI rad cap?
Russ Henry
Husqvarna
AA Class
1. I turned the idle screw out to increase the idle. 2. In Bend the coolant was low so when we stopped it would not start because it was to hot. It ran good other wise. On Sunday the bike would start but would not run unless I revved it hard. Plenty of coolant on Sunday
Since Bill piped in the other night....I dont doubt that he is waiting for you to bring it in so he can take a crack at it.
Russ Henry
Husqvarna
AA Class
I dropped it off first thing yesterday. won't get to it until tomorrowSince Bill piped in the other night....I dont doubt that he is waiting for you to bring it in so he can take a crack at it.