kawasakirider

Hi everyone, I've found the source of my lean syndrome in my losi XXL over half throttle. I noticed that the nipple on the HSN was extremely loose and the housing itself was, also. I took it out and I see that there are holes for the fuel to go through and realise that if these aren't aligned properly, I'll have issues.

How do I align them when I can't see them? I've been into nitro for a long time, but I've never had a drama like this, lol...

Cheers!

Mark _australia

iTrader: (2)

I am not familiar with that model / engine, but every motor I have seen has the ability to rotate the fuel nipple as you see fit.
It is a banjo fitting - designed to be screwed up tight in any orientation and it will work. That is why the "loop" part that slides on the HSN assembly has a big bowl kinda shape to it.

Post pics maybe?

Deckman

I don't think those holes have to line up.
I never worried about it. I always just set
Where I want the inlet nipple to be and tighten
Down the housing. Never had an issue.

kawasakirider

If they don't have to line up, how does the fuel make it to the carb? I've tightened them down and I'm 90% sure they're close to lining up anyway, so I'll get some permatex copper tomorrow and reseal everything and hopefully cure the problems I've been having. It's extremely frustrating.

houston

iTrader: (96)

Like posted earlier , it is what you call a banjo fitting which will pass the fluid (fuel) through the orifices when rotated/tightened down in any position as there is a gap internally that the fluid flows around and then into the hsn housing which has orifices that are metered by the hsn


Hope this helps

nitroexpress

I wouldn't use permatex or any sealer. It only takes a very small bit of foreign matter to clog the HSN. The washers provide all the seal you'll need.

kawasakirider

This carb doesn't have washers. It's a Losi 454 not a nova, haha. I've been running nitro for years and I haven't had a drama with an engine like this. Anything over half throttle, it quits. There must be an airleak somewhere.

BrakeTurnAccelerate

iTrader: (40)

EDIT:

Here is a better picture. There definitely should be washer between the HSN housing, the fuel inlet, and the carb body.

kawasakirider

There's no washer man, that is just a higher edge on each side of the banjo fitting.

Rsickles

iTrader: (21)

454 doesn't have shims on the banjo...

Angle the banjo however you want and snug it up. If the openings are clear/clean on the HSN, problem is likely elsewhere.

kawasakirider

Thank you.

What are the ACCURATE settings for the LOSI carb on the 454? The manual I have says 2.5 out on each needle, maybe it is way too lean, as some people are saying 3 turns or more?

I had it set to break in settings, 2.5 turns on the HSN and I added an extra 1/4 turn on the LSN for 2.75 turns out. It ran pretty hot like this, keen to get up to 300F according to the telemetry, but it never hesitated and died like it's doing now.

I have taken the needles back to where I started TONS of times and after half throttle it leans out way too much and dies.

I've just taken the engine apart and it all looks fine, there's nothing wrong with it. I sealed it up with permatex copper and also sealed the fuel tank primer up with this stuff (hope it's resistant to fuel!), I've followed some other word of mouth guides saying that 2.5 turns on the needles is too lean, and I've gone 3 out on each needle (even though I know 2.75 was plenty rich for the LSN, it' just a starting point to eliminate problems).

I don't know what else I can check for air leaks. I've changed the exhaust gasket, the fuel filter to an alloy one, the fuel line is new. If this doesn't work, I'll be stumped.

FLDan

The 454 tends to want to be run on the richer side...once mine got above 250ish, it started acting ultra lean. Non-insulated carb.

Rsickles

iTrader: (21)

Front bearing?

kawasakirider

I don't feel like taking the flywheel off, lol. If it is the front bearing, I'll just go and buy a picco. Not going to be bothered with it.

kawasakirider

Yeah it could be the carb issue, I guess. I've never had all metal carbs, so I can't really say for sure.