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Discussion Starter · #1 ·
well i have done all i know to do i bought V&H classic2 pipes and jet kit to match installed both it runs great but on deceleration it is backfireing and when i got home after the ride (20 miles) i noticed it running rich out of the exhaust i am thinking that i need to put the stock jets back in to it. i also called dynojet and talk to them and set it up to what their carb specialist said to do. im lost for now but if any one can help or tell me what to do. i am not a new mechanic but this one has me stumped thanks for the help

vn1500a 1995
My bike's modifications:
vance and hines classic 2 v&h stage 1 jet kit
 

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Birmingham AL
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17 Posts
Did you change your air intake any or only the exhaust? If you only changed the exhaust than the stock jets will probably work just fine, but if you change your air intake than you will need to change the jets.
 

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just cruzin by!
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Did you change your air intake any or only the exhaust? If you only changed the exhaust than the stock jets will probably work just fine, but if you change your air intake than you will need to change the jets.
+ 1000, pipes alone arent going to change enough to make a difference in fuel and air.I would put the old jets back in and see what happens.Chances are your still going to get a little popping on decel especially if it is cold out but it will not run rich.Make sure your air filter is clean also.
 

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Discussion Starter · #5 ·
thanks im going to change the exhaust gaskets and put the stock jets back in and resync the carbs when i do it ill post on here but everyone sounds right to me it is funny how the simple things get you with the carbs thanks for the help and all with this
 

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Nobody Home
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Personally I like the DynoJet jet kits. Before you pu the carbs back to stock, replace the exhaust gaskets. Sometimes you have to add an extra washer under the acorn nuts on the header flanges because the acorns bottom rather than tighten. Adjust the idle mixture screws for best idle, rich side of best idle. Sync the carbs. See how it runs. I assume when you called DynoJet you told them your intake was stock, pipes only. Makes a big jetting difference.
 

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USE BATH SALTS
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ur gonna have to open that baby up. get some more air in there. the jet kit is runnin a richer mixture.
 

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Discussion Starter · #10 ·
same ole same ole

well thanks for all the input i have done everything all of you have said to do rather than opening the intake. i ended up putting 112 jets in it and it cured the rich problem dyno jet told me to put 114 in it. (called local Dealer and they actualy helped) but i still have the annoying popping and a few back fires no exhaust leaks (new gaskets) even closed the reed valves off with a piece of 1/2in stock runs great sounds perfect till you let off the throttle it doesnt seem to do it everytime but it does it enough i also noticed this before i put the new pipes on but then it wasnt loud and annoying well now what???? I really dont know what else to do. thanks for all the help ed
 

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Nobody Home
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i still have the annoying popping and a few back fires no exhaust leaks (new gaskets) even closed the reed valves off with a piece of 1/2in stock runs great sounds perfect till you let off the throttle
How many turns out on the idle mixture screw did you end up with for best idle? Usually richening the idle/pilot jet fixes the popping if it's not from exhaust leaks.
 

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just cruzin by!
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mine pops a lot more in the cold air than the warm air.Also noticed that gas from QT. makes it pop more.I get gas at conoco and it does seem to do better.
 

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Discussion Starter · #14 ·
i set them at 4and a half turs out ill play with that today and see what t does i just filled it up so i got to go 100 miles or so for new gas i got mine from marithon i thought about setting it richer but it seems anything past 3 turns out sounded the same but im gonna try it
 

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Nobody Home
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i thought about setting it richer but it seems anything past 3 turns out sounded the same but im gonna try it
That means you need a bigger pilot jet. You want a pilot jet that gives best idle 3 - 3 1/2 turns out on the mixture screw. You need a pilot jet big enough that past 3 1/2 turns the idle gets worse.
 

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just cruzin by!
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i set them at 4and a half turs out ill play with that today and see what t does i just filled it up so i got to go 100 miles or so for new gas i got mine from marithon i thought about setting it richer but it seems anything past 3 turns out sounded the same but im gonna try it
when you rev it up does your rpm's hang or drop immediately? It should come down quickly right to idle speed. I would start at 2 1/2 turns out.each carb will be a different setting .
 

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Discussion Starter · #17 ·
well today i started over and tried the idle mix screw at 1.5 turns out and it sucked so went to 3. still same result i also put it at 4 then i started taking the whole bike apart and working on getting rid of the whole air system from the reed valve back i also called dyno jet and talk to them they told me that it might have somting to do with a vacume leak but i couldnt find any with wd 40

this is what i plan to do run the reed valves out and under the bike for vent and close off the lines going to the carbs and getting rid of the T if that dont fix it im done i guess i ll just have to hear the poping.

with the idle screw at 1.5-3 turns it hung up and then went to idle at 4-5 it falls right down it just kills me that it can run perfect on all but decel ................... well if any one has any more input let me know cause i havent killed the air inj system yet. i guess what i do is up to yall. 90 heads are always better than 1 thanks again for all the help and suggestions I still havnt tried the fuel ive been running 92-93 in it well thanks again ED
 

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Discussion Starter · #18 ·
That means you need a bigger pilot jet. You want a pilot jet that gives best idle 3 - 3 1/2 turns out on the mixture screw. You need a pilot jet big enough that past 3 1/2 turns the idle gets worse.
it actual was perfect when i ran it out 7 times and the screw was moving with the rpm with the engine i dont know but it did help the popping (just minimized it ) the screw only goes out so far then the spring dont contact it any more . it basicaly idles the same at 4.5 -7 it dont smell rich or hang or anything.

i wonder if anyone tried to change the carbs out with ones out of another twin carb bike. i changed my kawasaki bayou 300 out with a 300 trx carb and it is night and day. it is runnning like a scalded dog
 

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Nobody Home
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it actual was perfect when i ran it out 7 times and the screw was moving with the rpm with the engine i dont know but it did help the popping (just minimized it ) the screw only goes out so far then the spring dont contact it any more . it basicaly idles the same at 4.5 -7 it dont smell rich or hang or anything.
You need bigger pilot jets. The idle will improve and the popping will go away. Block off (plug) the air to the reed valves.
 

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just cruzin by!
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You need bigger pilot jets. The idle will improve and the popping will go away. Block off (plug) the air to the reed valves.
billy bob is right.If you can go out that far you need more fuel to control at a lower setting.
 
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