Restrictive fuel lines?

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Personally I think they are fine. Are you racing others? If not leave them alone. You'll need to replace the fuel lines probably next spring. So you've got time. The damn ethanol attacks the fuel lines and hardens them over time. With that all said I have installed the Full Force/snappy kit on my baja. Still have to replace the fuel lines yearly. Good Luck
 
I use 91 octane that is guaranteed ethanol free.

I was just curious really. I wouldn't mind different colored ones for just a new look ??‍♂️

You know a good carb upgrade from the factory g320 one?
 
For your truck no. What carb is on it now? If it's an 1107 I would stick with it. You can upgrade to a 990 but it doesn't have a choke. If you goo to The OBR RACING website they have some good videos about carbs and what not. I learned a lot from watching them.
 
1Coopgt said:
For your truck no. What carb is on it now? If it's an 1107 I would stick with it. You can upgrade to a 990 but it doesn't have a choke. If you goo to The OBR RACING website they have some good videos about carbs and what not. I learned a lot from watching them.
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I have no idea, I know it has the choke. It's whatever they come with from the factory. I'll go check it out
 
So the recent spat of high flow fuel lines and higher flow carbs thread we've had has me wondering if I understand the whole carn situation. Now my understanding, is if you want more fuel, you fatten up the jets delivering said fuel. I don't know about you guys, but even the lowly 668 has always had more than enough adjustment to deliver all the fuel I need, with lots more adjustments to go. So why wojld anyone need a bigger carb, when these engines don't max out the smaller ones.
 
21bangbang said:
Well that didn't answer my question. Perhaps I wasn't clear. Do these engines, barring crazy rcmax stuff, actually have need of larger carbs? To me it seems no, but perhaps im not understanding why they would.
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When it comes to performance yes. More air and more fuel equals more power. No matter the size of the engine, if you add more air and fuel you will get more power out of it, to a limit of course. So if there's a bigger opening for the air to make it in and bigger jets to supply more gas then you will get a bigger bang.
 
crucialRC said:
When it comes to performance yes. More air and more fuel equals more power. No matter the size of the engine, if you add more air and fuel you will get more power out of it. So if there's a bigger opening for the air to make it in and bigger jets to supply more gas then you will get a bigger bang.
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Fair nuff
 
The smaller engines unless modded no. The 668 will work just fine. It's supposed to be ranked at 30cc as per walbro spec. The 1107 comes stock on the g320 engine. You may see marginal power increase in upgrading to a 990 or 1107 over the 668. It still allows more air in then the 668, and isnt over bored enough to hamper idle characteristics in the smaller displacement class. So really needed 30cc and under, no. Will the 668 support mods, yes. Will upgrading hurt anything, shouldn't. Is there any benefit to swapping a perfect working carb that came stock? Ie 668 to 990/1107 not imo. And I'd never swap a 1107 out for a 990. 98% of us bash, so the extra tiny amd I mean tiny bit more flow you may gain out of a 990 is moot.
 
I saw a noticeable gain in power and throttle response on the stock 26cc going from a 668 to a 990. Granted I also had an exhaust that matched the motor and could adjust my clutch engagement to match the power band. Individual results will vary, but you might be surprised at the difference it can make even on a modest engine.

As for fuel lines, I'm still running 3/16"OD x 1/8"ID lines on the stock grommet. Sure, over a long span of time the outer portion will stretch, making it look like the fuel line has been constricted, but the inner diameter still hasn't changed. The wall thickness has simply reduced. I experienced this very phenomenon this season.

Even running my 34cc with old lines I was always rich as hell, so I am in no way concerned that my engine is starved. If anything, it could stand a bit more leaning.

My primary reason to choose a 990 over an 1107 is the sand factor. If you're going to run in sand you don't want the added risk of infiltration via the choke shaft and you sure as hell want to avoid a v-stack with a built in choke. For you guys sticking to dirt and grass, it's a non issue. I like to hit the coast, and am building out my car to go bonkers on the dunes nearby, so it's a major consideration for me. Sand is no joke.
 
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