dellorto phbh28 problems..?

DangerousDave · 26-08-2008, 22:30

hi,

I am trying to set up a dellorto phbh28 on a gilera runner 172cc, but when i turn the engine over petrol comes out of both 'overflow' nipples on the carb? why would this be happening? the float is fine also?

any info greatly appreciated!

**$aint** · 27-08-2008, 12:48

With "turn the engine over" you mean starting it?

DangerousDave · 27-08-2008, 16:24

yes, when i try to start the engine.

**$aint** · 28-08-2008, 00:02

Well, that either means the float isn't really closing the fuel-inlet or the fuel is being pumped into the carb under pressure.

DangerousDave · 28-08-2008, 00:15

hmm... ok. i will check float again tomorrow and let you know?

thanks

DangerousDave · 01-09-2008, 07:56

i checked the float again and it seems the bowl would not stop filling? fixed now! but now it is running again it seems to have a sort of missfire (splutters) when you pull away from standstill? from about 20mph it is fine, only when you pull of from standstill? what could cause this? mabie lighter rollers needed?

**$aint** · 01-09-2008, 10:43

Missfire/stuttering is usually a carburettor or iginition problem.

Does it sound like it runs to lean?

JRMN · 01-09-2008, 13:15

I have also the Dell orto 26 phbh

But the carb gives me only headache and problems

So i have buyed a new one

DangerousDave · 01-09-2008, 19:08

Quote:

Originally Posted by ;2740127

Missfire/stuttering is usually a carburettor or iginition problem.

Does it sound like it runs to lean?

Im not sure what you mean, but the spark plug is a dry grey sort of colour? also my carb settings are main jet 110, idle mix 3 1/2 turns out, needle one below top 'notch'. you think i could be running too lean/rich?

**$aint** · 02-09-2008, 23:26

If the spark plug is grey-ish you're probably running too lean.
Does it happen when you only give a little throttle (say 1/4 to 1/2 max).

It should look something like the one in the middle of this picture:
http://cpibase.atspace.com/afbeeldingen/bougie.jpg

DangerousDave · 03-09-2008, 07:43

It is fine when you give it 1/4 or 1/2 throttle, only splutters when its full?
also i cannot see pic?

**$aint** · 05-09-2008, 22:57

With splutter you mean it sounds like it four-stroking?

The picture is here:
http://cpibase.atspace.com/page/sproeier.htm

26-08-2008, 22:30	#1 (permalink)
DangerousDave gilerarunner.net	dellorto phbh28 problems..? hi, I am trying to set up a dellorto phbh28 on a gilera runner 172cc, but when i turn the engine over petrol comes out of both 'overflow' nipples on the carb? why would this be happening? the float is fine also? any info greatly appreciated! __________________ TPH172SPRINTER ------------------------------------ dangerousdave@gilerarunner.net

27-08-2008, 12:48	#2 (permalink)
$aint holy scootertuning	With "turn the engine over" you mean starting it? __________________ Goed hardrijden is een dure hobby...

27-08-2008, 16:24	#3 (permalink)
DangerousDave gilerarunner.net	yes, when i try to start the engine. __________________ TPH172SPRINTER ------------------------------------ dangerousdave@gilerarunner.net

28-08-2008, 00:02	#4 (permalink)
$aint holy scootertuning	Well, that either means the float isn't really closing the fuel-inlet or the fuel is being pumped into the carb under pressure. __________________ Goed hardrijden is een dure hobby...

28-08-2008, 00:15	#5 (permalink)
DangerousDave gilerarunner.net	hmm... ok. i will check float again tomorrow and let you know? thanks __________________ TPH172SPRINTER ------------------------------------ dangerousdave@gilerarunner.net

01-09-2008, 07:56	#6 (permalink)
DangerousDave gilerarunner.net	i checked the float again and it seems the bowl would not stop filling? fixed now! but now it is running again it seems to have a sort of missfire (splutters) when you pull away from standstill? from about 20mph it is fine, only when you pull of from standstill? what could cause this? mabie lighter rollers needed? __________________ TPH172SPRINTER ------------------------------------ dangerousdave@gilerarunner.net

01-09-2008, 10:43	#7 (permalink)
$aint holy scootertuning	Missfire/stuttering is usually a carburettor or iginition problem. Does it sound like it runs to lean? __________________ Goed hardrijden is een dure hobby...

01-09-2008, 13:15	#8 (permalink)
JRMN JRMN	I have also the Dell orto 26 phbh But the carb gives me only headache and problems So i have buyed a new one

02-09-2008, 23:26	#10 (permalink)
$aint holy scootertuning	If the spark plug is grey-ish you're probably running too lean. Does it happen when you only give a little throttle (say 1/4 to 1/2 max). It should look something like the one in the middle of this picture: http://cpibase.atspace.com/afbeeldingen/bougie.jpg __________________ Goed hardrijden is een dure hobby...

03-09-2008, 07:43	#11 (permalink)
DangerousDave gilerarunner.net	It is fine when you give it 1/4 or 1/2 throttle, only splutters when its full? also i cannot see pic? __________________ TPH172SPRINTER ------------------------------------ dangerousdave@gilerarunner.net Last edited by DangerousDave; 04-09-2008 at 07:47.

05-09-2008, 22:57	#12 (permalink)
$aint holy scootertuning	With splutter you mean it sounds like it four-stroking? The picture is here: http://cpibase.atspace.com/page/sproeier.htm __________________ Goed hardrijden is een dure hobby...