weber troubles

Phil · Posted: Mon Apr 29, 2002 4:06 pm Post subject: weber troubles

Still having some trouble with my 32/36 weber. At about 1/4 to 1/2 throttle there is a huge flat spot. When cold it's a bitch to keep the revs up, but it idles fine. When I take off in 1st, its ok until i get to 1/4 and a bit throttle than it jerks around and even sometimes stalls. Driving at higher speeds there is a loss of power at that point but under light loads and full throttle there is no noticeable loss of power. I've also noticed that I am using HEAPS less fuel. Ive got almost 300k to half a tank so far. Ive checked all the jets and none are blocked, and it has recently been rebuilt.
Thanks for any replies
Phil

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

OK,

sound like you are getting closer to the problem,

if full throttle is ok then try this,

swap your Secondary main jet ( bottom of fuel bowl)and aircorrection jet ( top of fuel bowl) to the primary side , then take it for a drive, DONOT use full throttle, if this solves your problem, your primary jets are too small,

Cheers
Eggy

Phil · Posted: Mon Apr 29, 2002 8:56 pm Post subject: Re: weber troubles

OK, I had a look at the jets, I had 132 primary main, 127 secondary main, and 175 primary air correction and 145 secondary air correction jets. Was that the wrong way around? Anyhow I swapped them and it runs a bit better but it still has a bit of hesitation and certain loads. I haven't tried full throttle yet, I'll just wait and see what you reckon about the jet sizes first.

Josh · backyard mechanic Joined: 04 Oct 2001 Posts: 602

I had the same problem man BUT it was my mechanical advance was stuck locked in the dizzy

Benjamin · backyard mechanic Joined: 05 Oct 2001 Posts: 525

I have suffered similar problems and ended up going through a bunch of jets to fix it.

My current setup is:
Jets: 145 primary, 150 secondary
Air correctors: 185 pri, 165 sec

Still runs a tad rich down low, so I will try 140 primary again now that everything else is running fine. The secondary is fine, maybe could go up a step and know she isn't going to lean out. They are a bugger to get just right, but when you do Very Happy

I didn't realise jets came in sizes between increments of 5 units?!? I have been buying individuals and now have a set ranging from 125 through to 150 in increments of 5. I could probably do with a 142 or 143 in that case with my primary.

Phil · Posted: Tue Apr 30, 2002 11:37 am Post subject: Re: weber troubles

Yeah I dunno, where do you buy them from? These jet sizes I have are what came with it when i bought my gem.

NeWaZ · tinkerer Joined: 08 Feb 2002 Posts: 161

yeh where the hell do you get them from???

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

http://www.carburatorsaustralia.com/

never dealt with them thou,

cheers
Eggy

Benjamin · backyard mechanic Joined: 05 Oct 2001 Posts: 525

I get mine through a local Weber specialist, about $6 a pop though Sad

This specialist is as dear as poison, charging $150+ for a carb kit and rebuild. I suppose these things are complicated, but that's a bit pricey in my mind.

I might check out that site eggy.