Carb sealing (the overlooked step)

[Purenitro]

This info has to do with any composite carb. The area where the aluminum cap is pressed into the composite body can be a problem and can affect carbs from hpi through to Picco's. I'm sure that the front bearing has been blamed for fuel leakage at the front of the engine when it is actualy the carb, it happend to me with my K4.6. I thought that the front bearing was shot but in fact it was the carb leaking between the coposite and the aluminum, so I took it out cleaned it right up and sealed the carb in that spot. After half a gallon there is no signs of leakage. This could be the problem with some of these engines running hot or hard to find the tune, I could crank it in or out an entire turn and see minimal performance changes. Now that it is sealed it runs like a champ.

#1 is the seal that most are familiar with.
#2 is the seal that is probably never realy been looked at and is the one that was leaking very badly.
#3 is just a good idea.

 

[scrogathon]

MY axial 32's carb has at least a 1mm gap there after a hard crash, it never ran right since.

 

[Jeremy]

What are you using to seal with ?

 

[Purenitro]

Threebond 1211, the ultra copper sealant works as well. 1211 is alot harder to clean off if you ever have to but the copper sealant seals ok too, it's not "as" reliable as the 1211 though.

 

[dvinesquirrel]

this was actually on my to do list today. glad i checked the forum first. is threebond 1211 something i can find in a hardware or automotive shop?

 

[Purenitro]

Your best bet is a atv/bike/boat/sled shop. It may be called yamabond/hondabond/kawabond etc. It is all the same stuff (threebond 1211) the high temp ultra copper sealant can be found in most hardware stores for half the price. 1211 is about $20 tube, you can get the copper for under $10.

 

[xll-SavageX-llx]

I have to seen my mid range every time i bash the vibration make the screw back out..
One questions is ok to apply some blue lock-tight to the thread ??

 

[BIGDAN89]

set it the seal teh needle up with what robin reccomends

 

[xtremsavage]

Robin, got a question for ya. I noticed this awhile ago, but haven't had a chance to ask the question. I'm gettin ready to do a full teardown andrebuild of the truck and the last few times I ran the truck I noticed it was leaking around the carb area but couldn't see exactly where. I'm gonna do an air leak test and reseal the motor up. Now, my question is, do I just seal around the outside or slide the comp. and alum. apart a little bit and then seal it up? Let me know, still gonna be a few days before I can get to it.

 

[Purenitro]

They don't come apart, the seal is topical, the area has to be perfectly clean so the sealant can bond to both surfaces well.

 

[xtremsavage]

They don't come apart, the seal is topical, the area has to be perfectly clean so the sealant can bond to both surfaces well.

Thanks Robin. It's on my to do list once I can actually get started with the truck.

 

[MikeK1981]

I just sealed over my MSN cause it just started leaking but I'm going to do the other two spots shown as well. Thanks for the write-up. BTW I'm using the copper stuff for now.