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Originally Posted by houston
(Post 15338732)
put some fuel in the tank ...... remove high speed needle keeping it clean ...... blow though pressure line to push fuel though carburetor intake ...... fuel should come out of the high speed needle housing for 2-3 seconds .... install the high speed needle .... run all the way in and back out to 4 turns form all the way in ..... start again ..... i agree that your plug may be toast as well
- New Plug - Fresh Fuel and Fuel line. Still is lean on top at open throttle to the point where can see air bubbles in the fuel line between fuel filter and carb. I don't understand how the engine is running at 100deg perfect for 3 race days to running our of fuel and being super lean? |
Originally Posted by 91junior
(Post 15340681)
Honestly not to sure what to do. I have - sealed around my HSN and replaced the O-rings.
- New Plug - Fresh Fuel and Fuel line. Still is lean on top at open throttle to the point where can see air bubbles in the fuel line between fuel filter and carb. I don't understand how the engine is running at 100deg perfect for 3 race days to running our of fuel and being super lean? |
Originally Posted by J.Whiting
(Post 15340686)
if your getting air bubbles in the fuel line then its NOT the engine its either your tank or fuel filter... check the tank.. submerge under water and blow into the exhaust nipple while having the fuel line plugged where you have it on the carb nipple.. yes check the complete fuel line and filter on the tank as you run it in your vehicle and see where the bubbles are coming from.. also double check that the exhaust is getting into the tank from the muffler.. ive had a pipe go bad from getting hit and it stopped putting pressure into the tank.. jeremy
just tried that and nothing |
hhhmmmmmm.. that's not good as air in the line is generally the tank or clunk in the tank... does it bubble all the time or just around half tank?
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Originally Posted by J.Whiting
(Post 15340739)
hhhmmmmmm.. that's not good as air in the line is generally the tank or clunk in the tank... does it bubble all the time or just around half tank?
I just done what Monty suggested. Marked the carb with a pen and measured with verniers as well as wound the hsn all the way in and counted the turns back out to its original place. removed HSN all together, blew some fuel through and wound HSN back into its original spot. I also pulled all the old fuel line off between tank and motor and replaced it with brand new tubing. Car started straight up and ran. Didn't suck air like before (before would suck air to the point the engine would cut in and out). Just ran for 9 minutes and came in at 102degrees. very very bizarre. At WOT at the moment there is only some small pin head bubbles and only at the HSN where as before they were all along the line from the filter to engine and were the size of small stones. I feel dumb as Ive never seen this happen before or know why as my fuel tubing had no holes that I could see when submerged |
bubbles does not alwys mean an air leak, they can also be caused by vibrations, that is why most fuel tanks are placed on rubbers with a non tightened screw.
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send your engine to amr engines tuned, and you take away the pain of head. they are engineers in engines nitro. not touch nor make more nothing to the engine. is the decision smarter. |
Originally Posted by 91junior
(Post 15340753)
Well this is weird. You can see air bubbles in the line between the Fuel filter and HSN.
I just done what Monty suggested. Marked the carb with a pen and measured with verniers as well as wound the hsn all the way in and counted the turns back out to its original place. removed HSN all together, blew some fuel through and wound HSN back into its original spot. I also pulled all the old fuel line off between tank and motor and replaced it with brand new tubing. Car started straight up and ran. Didn't suck air like before (before would suck air to the point the engine would cut in and out). Just ran for 9 minutes and came in at 102degrees. very very bizarre. At WOT at the moment there is only some small pin head bubbles and only at the HSN where as before they were all along the line from the filter to engine and were the size of small stones. I feel dumb as Ive never seen this happen before or know why as my fuel tubing had no holes that I could see when submerged |
Originally Posted by J.Whiting
(Post 15340850)
probably the fuel filter has a leak then
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it should... but run it without the filter if the engine is running good..
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Ive had tanks that dont show bubbles when submerged but would seep fuel from the seams and leak out. Imo anything extra added to the fueling system is just another point for a leak to happen, the simpler the better.
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Originally Posted by 91junior
(Post 15340753)
Well this is weird. You can see air bubbles in the line between the Fuel filter and HSN.
I just done what Monty suggested. Marked the carb with a pen and measured with verniers as well as wound the hsn all the way in and counted the turns back out to its original place. removed HSN all together, blew some fuel through and wound HSN back into its original spot. I also pulled all the old fuel line off between tank and motor and replaced it with brand new tubing. Car started straight up and ran. Didn't suck air like before (before would suck air to the point the engine would cut in and out). Just ran for 9 minutes and came in at 102degrees. very very bizarre. At WOT at the moment there is only some small pin head bubbles and only at the HSN where as before they were all along the line from the filter to engine and were the size of small stones. I feel dumb as Ive never seen this happen before or know why as my fuel tubing had no holes that I could see when submerged |
Good morning lovers of NOVAROSSI I already have my new MBX8 and I am a beginner pilot (6 years old). I bought a P5xlt 9901-41021. I already finished the break in (2L). Someone may help me adjust the needles. I live in Vigo-Spain. use venturi 6.5 and nitro RUNNER TIME 25/8 and spark plug CTO6 and the track where you drove is fast and with a lot of grip. MANY THANKS |
Originally Posted by Anunnaki
(Post 15341717)
Good morning lovers of NOVAROSSI I already have my new MBX8 and I am a beginner pilot (6 years old). I bought a P5xlt 9901-41021. I already finished the break in (2L). Someone may help me adjust the needles. I live in Vigo-Spain. use venturi 6.5 and nitro RUNNER TIME 25/8 and spark plug CTO6 and the track where you drove is fast and with a lot of grip. MANY THANKS this will be the biggest help |
thank you very much HOUSTON, the video not only helped me adjust my new P5xlt, but taught me why the engines behave a certain way when you adjust a bad needle. MANY THANKS HOUSTON. |
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