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Blaxland Twin Problems

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kyle
Visitor
Posted on Sunday, October 07, 2012 - 03:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi All

Just bought my self a Blaxland Twin but it is having problems. it is easy to start an idels well but when i put it in foward it some time stalls or it will go in to foward and run for awile and then it slows down and stops
dose any one have any ides on how to fix it
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David Myers
Senior Member
Username: dave_myers

Post Number: 121
Registered: 11-2006


Posted on Sunday, October 07, 2012 - 04:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Kyle, Make sure that the breather hole in the Fuel Tank Cap is clear. Second, take off the fuel line and blow it through and make sure it is clear as well. Also the fuel tank outlet has to be approximately 8 inches (200 mm) above the Carby fuel inlet. That is a rule of thumb. Basicaly it appears that you are not getting enough fuel feed when under power. I have my fuel line dropping down from the fuel tank to the floor and run under the floor then up to the carby fitting. I also have changed the line to a 5/16 internal size and I do not have any feed problems at all. Hope this gives you an idea to sort it out.
Where are you located?.

Cheers, Dave
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kyle
Visitor
Posted on Sunday, October 07, 2012 - 04:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Dave, the fuel line in it comes from the fuel tank sright down to a fuel filter and from that it gose in to a brass pipe in to the carby. the carby i set up on a vertical. it seem to run fine the first time i run it but the second time i used it it started to do this and when it stalls the motor serms to get flooded
i am located near brooklyn
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Andrew Munns
Senior Member
Username: johnoxley

Post Number: 71
Registered: 04-2010
Posted on Sunday, October 07, 2012 - 05:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Look for fuel starvation as mentioned above. Seems the most likely cause, but I have the Alpha D carby booklet if you need it scanned. It provided detail on adjusting the air valve for speeds above 1/4 throttle. Do you need a pdf?
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neil r jones
Senior Member
Username: senojn

Post Number: 100
Registered: 08-2006
Posted on Sunday, October 07, 2012 - 05:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Kyle ,
You have not addressed the the height question of David's , as you need sufficient gravity feed .
Also you mention filter . If it is not an original copper gauze type but a modern fuel filter it will take out your oil and change the 32:1 ratio.
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kyle
Visitor
Posted on Sunday, October 07, 2012 - 06:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Neil the fuel tank is above the carby as it is at the front of the boat and the fuel filter is plastic
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David Myers
Senior Member
Username: dave_myers

Post Number: 122
Registered: 11-2006


Posted on Sunday, October 07, 2012 - 08:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Kyle, Have you drained the tank & Carby? If the boat has been standing for a while there is likely rust build-up in the tank and can restrict flow. By saying that the carby is flooding, check the Float and make sure it is not sinking. It may need replacing. DO NOT USE E10 fuel... If left standing the ethanol evaporates and leaves a residue like Talcum powder which goes straight thru the filters, will destroy any rubber fuel line etc and blocks the main jet. The motor will idle but will not power on. If you have to have the Carby serviced (New float etc) I can give you a contact at Davistown who rebuilds Blaxlands and Carbies etc.

Cheers, Dave
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kyle
Visitor
Posted on Sunday, October 07, 2012 - 08:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Andrew it would be great if you could email me a pdf of the alpha d carby booklet to kyle.bt@gmail.com
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kyle
Visitor
Posted on Sunday, October 07, 2012 - 08:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi dave i will give it a go by cleaning the carb and tank as i belive that it is old fuel as the old owner haddent used it for a long time and it smells realy bad and the oil that comes out the exuast is realy thick black oil that even turns the water black in the river the fuel line is mostly brass its only at the front is ruber from the fuel tank to fuel filter and to the brass fuel line wich gos ale the way to the carby. The flowt has been replaced with the moden one. I think it maybe somthing to to with the fuel as when going a long it sosent seem to have much push that could be me tho it is a 5hp twin pushing a 16 foot fiberglass boat

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