Cant Get Upgraded Walbro Carb to Start? Suggestions Pls. Tks.

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Thread starter #1
So…I’m frustratingly installing my 3rd 1107 carb now on my V3 MT and I am starting to believe it’s not the carbs, but something I am doing incorrectly and I could use a few suggestions from the group vets here.



Getting good spark and fuel so that’s ruled out.



Also, if I swap back to the factory 668 ….couple of pulls with the choke = pop, couple more pulls and turns over like a champ.



I’m choking the 1107 the same as the 668, but not getting a “pop”, which I find odd?



I can pull the 1107 until the cows come home and nothing…except the eventual good old flooded engine.



Set the 1107 H needle to 1 7/8 per DDM guidance, +/- ¼ turn…and the L needle to 1 5/8 +/1 ¼ turn.


Nothing, I mean nothing! It’s like the 1107’s are DOA.



I read on another forum a member said to try starting w/o priming the bulb. Not sure what that will really do, but I will try that and report back.



Yet another thread suggesting setting the H / L to 3 full turns to clean out any residue. Tried that as well, nothing.



I also tried blipping the throttle a little while starting and not the faintest sound of wanting to start with the 1107.



Surely there is a trick that I am missing here???



Thanks for the assistance everyone.
 

Phill2

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#2
Are you leaving the choke on hoping for a pop?
Use the choke for 2 pulls only then turn it off regardless or it will flood.
I find the 1107s run very rich so you may have to lean it off a bit.
 

MARLEY76

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#4
westsiderkg i agree with phill2. everytime you pull the starter its adding more fuel to engine in return makes it flood . wich that alones a pain in the $%rse... why are you swapping carbs over if the old one works fine ?...
 

Phill2

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#6
So…I’m frustratingly installing my 3rd 1107 carb now on my V3 MT and I am starting to believe it’s not the carbs, but something I am doing incorrectly and I could use a few suggestions from the group vets here.



Getting good spark and fuel so that’s ruled out.



Also, if I swap back to the factory 668 ….couple of pulls with the choke = pop, couple more pulls and turns over like a champ.



I’m choking the 1107 the same as the 668, but not getting a “pop”, which I find odd?



I can pull the 1107 until the cows come home and nothing…except the eventual good old flooded engine.



Set the 1107 H needle to 1 7/8 per DDM guidance, +/- ¼ turn…and the L needle to 1 5/8 +/1 ¼ turn.


Nothing, I mean nothing! It’s like the 1107’s are DOA.



I read on another forum a member said to try starting w/o priming the bulb. Not sure what that will really do, but I will try that and report back.



Yet another thread suggesting setting the H / L to 3 full turns to clean out any residue. Tried that as well, nothing.



I also tried blipping the throttle a little while starting and not the faintest sound of wanting to start with the 1107.



Surely there is a trick that I am missing here???



Thanks for the assistance everyone.
If it's a 32cc it should have an 1107 stock.
 

MARLEY76

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#10
oh see!! ive learnt something new here didnt know the bigger the cc the engines are. the carbs are diffrent spec.. im ok then phill2 as ive recently rebuilt my engine to a 29cc 4bolt bigbore kit with brandnew 997 walbro carb seems to run fine tho....
 

Phill2

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Yeppoon QLD Aus
#11
oh see!! ive learnt something new here didnt know the bigger the cc the engines are. the carbs are diffrent spec.. im ok then phill2 as ive recently rebuilt my engine to a 29cc 4bolt bigbore kit with brandnew 997 walbro carb seems to run fine tho....
Yep 997 and 668 are the same carb.
I run a 668 on my 29 too.
I tried an 1107 on it but it just bogged all the time.
 
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