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Guest Message by DevFuse
 

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My 78 BRAT project....


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91 replies to this topic

#76 Kevint143

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Posted 16 March 2014 - 11:50 PM

Good work!

#77 jonpaul03

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Posted 17 April 2014 - 09:08 PM

Does anyone have any experience with a Weber offroad carb on the BRATs? Do they typically dump fuel into the primary? Is there an exact way to route the vacuum lines considering the stock carb required more vacuum connections?



#78 spicypeanut

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Posted 17 April 2014 - 10:47 PM

Does anyone have any experience with a Weber offroad carb on the BRATs? Do they typically dump fuel into the primary? Is there an exact way to route the vacuum lines considering the stock carb required more vacuum connections?

I'm having trouble with my vacuum lines. I have no idea which one goes where and it is running like garbage. Wants to die as soon as I try to let the clutch out. Under heavy acceleration its happy, but anything less than that and it bogs and wants to die.



#79 jonpaul03

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Posted 05 July 2014 - 10:10 AM

It has been a while since I have posted on here. I was having issues with the electric choke on the Weber Carb since I last posted. I ended up replacing the electric choke with a manual choke and now I have control!!! The Weber seems to be operating properly now with the new choke and the placement of the vacuum hoses.

 

 

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#80 jonpaul03

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Posted 05 July 2014 - 04:06 PM

Once the choke was figured out I decided to put the BRAT on ramped and block up the back... I pressure washed the hell outta it and scraped the stuff with edges. I rust-reformed it all and still in the process of undercoating it. I am gonna leave it on the ramps so we can fab an exhaust. Any recommendations on a muffler to replace the pre-muffler under the driveshaft? I think I am gonna run one new age muffler rather than a pre-muffler and a muffler. Ideas?

 

 

 

 

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#81 jonpaul03

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Posted 05 July 2014 - 04:20 PM

And.........I also replaced the gauges. I went with the BRAT gauges with a tachometer. I had to run a new wire to the coil, but it works flawlessly! Plus, they are way more sexy.

 

 

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#82 jonpaul03

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Posted 09 August 2014 - 08:56 AM

I finished the exhaust this weekend! I decided to go with the FlowMaster HP-2 Series muffler. I also decided to take the tailpipe out of the driver side instead of running it under the CV and out the back.

 

 

 

 

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Edited by jonpaul03, 09 August 2014 - 08:57 AM.


#83 Mykeys Toy

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Posted 09 August 2014 - 07:48 PM

Glad you got it worked out.. Nice build.  The electric choke on mine would do the same thingmy problem was I tapped power from the wrong thing so it never worked. Once I figured that out it ran like a champ. 

  I am not sure about the 78s but the pre muffler on the newer cars is a resonator which helps knock down some of the drone at higher rpm.  So how does it sould the flowmaster? got a clip?

 

Mike



#84 jonpaul03

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Posted 11 August 2014 - 08:32 AM

Thank you! I like having the control with the manual choke more than the electric choke. The Flowmaster definitely sounds more aggressive and a bit louder than stock, but overall it sounds pretty good.  The clip I have is with the BRAT sitting in the garage, so it echoes more. The sound in the clip isn't completely accurate.



#85 jonpaul03

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Posted 20 May 2015 - 12:33 PM

I have been away for a while due to relocating to NM. There was a little progress with my 78'.

 

 

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#86 jonpaul03

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Posted 06 April 2017 - 03:42 PM

I had to fabricate an EGR tube and it cracked at the lower 90 degree angle going to the head. I either need to fab another one or delete the EGR all together....



#87 jonpaul03

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Posted 08 April 2017 - 01:25 PM

Has anyone seen 1st gen Brats sell recently? If so, how much were they going for?  I don't necessarily want to sell mine, but I am curious of what the market is like now.



#88 jonpaul03

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Posted 05 December 2017 - 08:38 PM

Hey guys! I have been away for a while and now that I am back I have something to ponder with yall. I have an issue with my BRAT and if yall have any advice or have experienced the issue I would love to hear it.

 

It all started shortly after my EGR tube failed and the accelerator pump on my Weber carb failed. I could not get the brat to start unless fuel was poured into the ccarb and it was ran with the choke fully engaged. So.....I will break it down by series of events to follow:

 

1. Replaced the EGR tube and accelerator pump on the Weber. (problem still persisted)

2. Replaced the original fuel pump with a new one from rockauto. (problem still persisted)

3. Rebuilt the Carb (problem still persisted)

4. Checked/cleaned the sparkplugs which were covered in carbon tar (problem still persisted)

5. Drained the gas tank and replaced fuel with fresh fuel +some stabil for removing moisture (problem still persisted)

6. Replaced all of the fuel hose under the hood with new hose and fuel filter (Problem still persisted)

 

I think I have pretty much eliminated a fuel issue. Any more thoughts on what might be the issue with my BRAT? Before the initial problems the BRAT was running great. It idled around 900 rpm and had very nice throttle response. It didnt smoke or run rich. I am looking for assistance trapping the gremlin! Any words of wisdom are greatly appreciated!!!!



#89 Naked Buell

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Posted 05 December 2017 - 09:28 PM

It sounds like the carb to me. I have the weber also and she idles high, even with the idle screw backed all the way out. I think that is has
has to be the carb. My Brat ran like a swiss watch. Then I had problems found out the diaphram in the dist. went bad. Replace it and upgraded to the
Weber and she has never ran like she did. Still runs awesome when your foot is set, but even with a fresh built ea81, she still doesn't
run as smooth as she has before.
Just my 2 cents.
I would think it was the carb but you said you rebuilt the carb. I did the same with mine but I keep thinking it is a carb problem for me
or I have a vacuum leak.

#90 jonpaul03

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Posted 05 December 2017 - 09:53 PM

The weber looked great when I tore her apart. I checked the vacuum hoses and they look good. My weber didnt idle great until the valves, timing, and fuel/air/idle screw were adjusted good, but after I replaced the accelerator pump and EGR tube it hasnt ran good. I am almost thinking its a timing issue or distributor issue...... not sure though



#91 Naked Buell

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Posted 07 December 2017 - 11:19 AM

Mine drives me mad. It isn't like there is all these vacuum lines or something. It is pretty basically. My ea81 has maybe 7000 miles on her
and she drives great other than she idles high and lacks the real power that all want in an Ea.

#92 jonpaul03

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Posted 07 December 2017 - 07:52 PM

Mine just wont idle without the choke fully engaged. It ran perfect before I replaced the EGR tube and accelerator pump.... doesnt make sense. 






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