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1 stud build
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2104
Location: MI

PostPosted: Sun May 24, 2020 8:16 am    Post subject: Reply with quote

If you blocked the return line from the fuel pressure regulator then how is it supposed to regulate pressure?
Does it not need to bleed the pressure off to the return line to do its job?
Blocking the FPR return line very well may put you at max fuelpump pressure..

Can you measure your actual pressure? What kind of FPR is it?
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80 Turbo - Slightly Modified
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Sun May 24, 2020 8:35 am    Post subject: Reply with quote

didnt block the fuel return from preassure regulator, i thought the vent tubes were returns on the carburetor so i blocked them off first but took them off once i realize that. fuel preassure should be 2 psi. i blocked preassured fuel and put a t with a regulator and it stayed at 2, screwed the regulator all the way in.
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Mikko  



Joined: 02 Jun 2017
Posts: 24
Location: Finland, Helsinki area

PostPosted: Mon May 25, 2020 6:28 am    Post subject: Reply with quote

Hello,

Based on setting up many similar bike carbs it is vital to keep the breather hoses, usually between the gap of carbs 1/2 and 3/4 open to atmosphere. If you block them, carbs are tight until you press pedal even once, then the flow will not stop/overflooding as the float can't push air out of the upper carb body. Fuel is usually fed through one hose through carbs 2/3. In general, float levels should be adjusted so that the float tang closes the fuel needle when gas level hits the seam between float bowl/carb body. If you don't do so, the carbs will starve on full throttle and resulting lean mixture. This is where you must consider the angle of carbs, but it seems the seam between bodies/float bowl is angled and now quite horizontal to ground so you should be able to get it working.

I would try the setup with an secondary tank hanging somewhere over the carbs and checking that floats work and fuel is cut off. Expect rough running after idle, you need to also sync the carbs. After all is set then connecting it to the normal tank and thinking how the fuel returns, etc works.

Hope this helps.

Br, Mikko
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Tue Jun 09, 2020 4:50 am    Post subject: Reply with quote

new needles fixed the issue
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Wed Jun 10, 2020 5:59 am    Post subject: Reply with quote

https://youtu.be/yJ0SgM3NcaA
Signs of life, i think ignition is bit off and i need to add more fuel on idle
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Thu Jun 11, 2020 8:31 am    Post subject: Reply with quote

https://www.youtube.com/watch?v=P-oNQP_o5pY

Last edited by Juho on Fri Jun 12, 2020 5:28 am; edited 2 times in total
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2104
Location: MI

PostPosted: Fri Jun 12, 2020 5:16 am    Post subject: Reply with quote

Engine sounds solid..
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Fri Jun 12, 2020 5:30 am    Post subject: Reply with quote

got timing light today, i think ill richer the mixture because the lambda isnt installed yet, just to be safe when timing the ignition
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Sun Jun 14, 2020 12:36 am    Post subject: Reply with quote

Smoke coming from exhaust manifold are i think is just extra gasket stuff but could it be something else?
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Sun Jun 14, 2020 3:25 pm    Post subject: Reply with quote



made this for daily driving.
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Sun Jun 14, 2020 3:40 pm    Post subject: Reply with quote

got the engine running better, leads for 2 and 4 were mixed up, but ofc ran into new problems. my two right carburetors leak when running the engine and the most right one started doing this after engine had ran.

https://www.youtube.com/watch?v=4inPrg_GzGI


Also there is this smoke coming from exhaust manifold area, i think it is from the left over copper exhaust manifold gasket but im not sure.


https://www.youtube.com/watch?v=zmVrhYpQSss
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safe  



Joined: 18 Mar 2017
Posts: 188
Location: Sweden

PostPosted: Mon Jun 15, 2020 3:58 am    Post subject: Reply with quote

Dont mind the smoke, it will burn off, unless you have an oil leak on the exhaust side...
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Wed Jun 17, 2020 5:38 am    Post subject: Reply with quote

Things not looking good......

Getting this smoke after running from intake manifold
https://www.youtube.com/watch?v=mqE8ww-kJ9o


Also found some oil under the exhaust side after jacking it up....
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safe  



Joined: 18 Mar 2017
Posts: 188
Location: Sweden

PostPosted: Wed Jun 17, 2020 5:59 am    Post subject: Reply with quote

Doesnt look like a problem, quite normal.
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Juho  



Joined: 03 Oct 2018
Posts: 133
Location: Finland

PostPosted: Wed Jun 17, 2020 6:53 am    Post subject: Reply with quote

Are you sure about that? smoke looks almost like fog
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