I know you've since thumped the firewall down but I hope the Weber isn't still hitting it when you accelerate. (bloody rodchange boxes...)
I like how Minispares said that manifold will let it clear...
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| Weber experts... https://www.ausmini.com/forums/viewtopic.php?f=2&t=78065 |
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| Author: | sam_1100 [ Wed Aug 15, 2012 8:47 pm ] |
| Post subject: | Weber experts... |
The dcoe 40 is causing the engine to stall when trying to take off, we have hopefully narrowed it down to the idle circuit having some issues. I have jetted it to Vizard specs for a 1098 mildly worked engine, however the book also states that this set up is for 2.5 turns out on mixture idle screws, whereas weber suggest you should be between 3/4-1.5 turns. I have a 50F2 idle...also tried a 50F12 with no luck...GR suggested maybe a 40F9. Can anyone give any insight into even just cleaning out the circuit any similar problems they might have come across? |
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| Author: | low n blown [ Thu Aug 16, 2012 2:07 pm ] |
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Sounds like is leaning out. What are your other jets? Pump jets are important too. They add fuel on depression of the throttle but stream at higher revs. Changing pumps often affects your main circuit. Check the manifold is seated properly too, and check your timing. |
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| Author: | drmini in aust [ Thu Aug 16, 2012 3:57 pm ] |
| Post subject: | |
I know you've since thumped the firewall down but I hope the Weber isn't still hitting it when you accelerate. (bloody rodchange boxes...)
I like how Minispares said that manifold will let it clear...
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| Author: | sam_1100 [ Thu Aug 16, 2012 5:49 pm ] |
| Post subject: | |
I really hope it's not still hitting! I've made a decent gap under the rams and it will take off if I get it above 4000 rpm which is when I would presume the thing would hit the most. Not the ideal clutch releasing rpm though! Good old minispares... The weber hit even without the rams on! I've got a 40F9 and 60F9 idle arriving tomorrow so we will see... Start with the cheap fixes and move on...I tried a 50F12 after the 50F2 and it did slightly improve. Slight timing changes have also helped. For some reason I can get reverse at slightly lower revs than going forward?? Bring the strobe tomorrow Kevin 
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| Author: | sam_1100 [ Thu Aug 16, 2012 6:13 pm ] |
| Post subject: | |
Vizard jetting for 1098 with modified head, semi race cam and extractors: 34mm chokes 4.5 aux 145 mains 180 air corrector F16 em tubes 45 pumps 50F2 idles So Ive put this set up with a worked 202 head and an RE83 cam as suggested! Idles so well but nothing under load! |
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| Author: | Rob M [ Thu Aug 16, 2012 6:33 pm ] |
| Post subject: | |
check your fuel lines, filter, and fuel pump |
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| Author: | sam_1100 [ Thu Aug 16, 2012 6:37 pm ] |
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I checked the filter had no effect, how could I check the fuel pump? It's a brand new facet. Fuel is definitely being delivered.. |
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| Author: | Mike_Byron [ Thu Aug 16, 2012 7:22 pm ] |
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What pressure is the facet designed to deliver ????? Although if the fuel holding device is full the weber pump should push enough fuel into the engine to get moving. Do you have a blocked jet ??? Mike |
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| Author: | sam_1100 [ Fri Aug 17, 2012 11:43 am ] |
| Post subject: | |
Problem solved!! The float needle had unwound itself so there was no travel and only about 10% fuel in the bowl!! No wonder it was a bit lean! |
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| Author: | TheMiniMan [ Fri Aug 17, 2012 12:22 pm ] |
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i`d check your float level first
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| Author: | drmini in aust [ Fri Aug 17, 2012 3:40 pm ] |
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TheMiniMan wrote: i`d check your float level first
He did that when he fitted it. It's all good, the Dr made a house call today. One spark plug was no worky so we changed that, then took it for a run and it's going well. Is a bit rich at idle, I'm sure Sam can sort that out now. |
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| Author: | woodwormm [ Fri Aug 17, 2012 3:44 pm ] |
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I wish I was in the good Dr's house call range 
does Kev have a little black medicine bag full of tricks? |
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| Author: | sam_1100 [ Sun Aug 19, 2012 7:54 pm ] |
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Minis going great now...power increase has been phenomenal! Increased the idle jets for a better idle and easier take offs...however I still have one issue! It's happened twice now..if I coast down hill in 3rd gear or so, when I pull up (there's a stop sign as the bottom) it sticks on about 3500 RPM, until I take off. Anyone had any similar issues? Possibly flooding as I go down hill? Not a big deal just feel a bit strange sitting at a stop sign making a racket! |
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| Author: | drmini in aust [ Sun Aug 19, 2012 8:10 pm ] |
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sam_1100 wrote: Minis going great now...power increase has been phenomenal!
Increased the idle jets for a better idle and easier take offs...however I still have one issue! It's happened twice now..if I coast down hill in 3rd gear or so, when I pull up (there's a stop sign as the bottom) it sticks on about 3500 RPM, until I take off. Anyone had any similar issues? Possibly flooding as I go down hill? Not a big deal just feel a bit strange sitting at a stop sign making a racket! Maybe the Weber `cold starting enrichment device' is letting fuel through. This is a known issue with old Webers, so some people plug the circuit off (read that Weber book you have). Dunno history of your carb, just sayin'. |
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| Author: | 1310/71 [ Mon Aug 20, 2012 11:29 am ] |
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Could it be the throttle linkage sticking? Is the return spring strong enough or catching somewhere? Does it happen at any other time - ie on level ground? |
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