Faulty Carb?

[MonsterAir]

Anyone ever have a bad Walbro carb outta the box?

I've got a 990 on my g320 and it won't hold a tune for chit. I can get it tuned but it just won't hold it. Every weekend I run it I get it close to where I want it and then the following week it'll run lean and I gotta do it all over again. At this point I've got to be over 1 1/2 turns out on the low end. It typically starts and idles the way I left it but after a few laps it just gets super lean and I have to richen, this is every time I go to run it. Yesterday I flipped the truck during a turn, go and flip it back over and the engine just went super lean (not normal) richened the low end 1/8 and back to the way it was. 2 laps in and I had to turn it in 1/8. Damn thing just won't hold a setting.

In the process now of changing some possible causes, ordered billet insulator to replace plastic one and all new heavy duty gaskets. Cleaned carb and air filter already, that didn't help. No scoring on the piston when I peaked in.

Could a failing ignition cause an issue like this?

 

[RcJunkie13]

paging @Seandonato73

Is ur tank vented good??

 

[Rep732]

I have monster, it came with my g340 red arrow engine. Mine was holding the engine back from revving out and tuning was very narrow on the carb meaning a adjusting the needles a hair would make it worse.

don't bother with the aluminum insulator I just had to take mine off because the heat in the summer made me have issues with vapor locking my carb and boiling the fuel in the primer bulb

paging @Seandonato73

Is ur tank vented good??

Oi when you piss off batman then batman no longer shows up for you din lou

 

[RcJunkie13]

don't bother with the aluminum insulator I just had to take mine off because the heat in the summer made me have issues with vapor locking my carb and boiling the fuel in the primer bulb

plus ive heard of them being warped

 

[Rep732]

Ok

 

[RcJunkie13]

yes
what is that supossed to mean?

 

[Rep732]

You push to far and i have nothing else to say to you anymore

 

[RcJunkie13]

how so, just bc ive heard of aluminum isolator blocks being warped?

 

[MonsterAir]

paging @Seandonato73

Is ur tank vented good??

Yes it's vented and the vent it working.

I have monster, it came with my g340 red arrow engine. Mine was holding the engine back from revving out and tuning was very narrow on the carb meaning a adjusting the needles a hair would make it worse.

don't bother with the aluminum insulator I just had to take mine off because the heat in the summer made me have issues with vapor locking my carb and boiling the fuel in the primer bulb

Ok noted, I'll have to contact DDM if the new parts don't fix the issue. Just that it's over a month old now.

I'm going to swap the insulator for billet so I don't have worries of melting the plastic one or are you saying I should just have extra plastic ones on hand? Guy at the track last weekend lost a race due to melted/warped insulator, I don't want that to happen to me. I push my rig as hard as it will go.

 

[Rep732]

If the insulator is from ddm its a waste. Get it from OBR...I just took my ddm insulator off because I couldn't use their delrin gaskets because the whole intake with the carb would get loose quickly. Obr has a better solution

 

[MonsterAir]

If the insulator is from ddm its a waste. Get it from OBR...I just took my ddm insulator off because I couldn't use their delrin gaskets because the whole intake with the carb would get loose quickly. Obr has a better solution

I can't find one on OBR's page and yes I'm not excited about those delrin gaskets either. I've used in past and they leak air.

 

[Rep732]

Here ya go https://oneillbrothers.com/products/6335-obr-g320-billet-intake-manifold-fits-32cc-34cc

 

[RcJunkie13]

ive also heard of the rb innovations one... looks pretty neat, it has a filter and heat sync and its shorter for better low end response (not sure if that last parts a gimmick or not tho)

 

[MonsterAir]

Thanks Rep


Screw RB Innovations I don't trust their goods and it comes with that stupid delrin gasket. Now I'm torn, go with OBR or just a new plastic one.

 

[RcJunkie13]

i say go for the obr, it isnt expensive, has a better insulator and who doesn't like billet, I was talking about the cheap ones warping btw

 

[MonsterAir]

Traveling for a race this coming Sunday and don't know if OBR will get me this in time. I'm gonna need a day to retune the truck before I go.

 

[RcJunkie13]

then grab a stock one to keep u going for the time being

 

[Rep732]

The aluminum insulator will show itself in less than 15 minutes... I just had this issue last weekend. I just placed an order for an obr one

 

[RcJunkie13]

The aluminum insulator will show itself in less than 15 minutes

wdym?

 

[MonsterAir]

I'm going to order the OBR version. Seems like a good deal with all those heavy duty gaskets.