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Post by Dog on Mar 6, 2008 20:09:51 GMT 1
Evening all.
I need to rack a few brains...
Right, tried to start my fresh 1380 tonight, to which was running-ish, ona HIF38.
Obv the mixture was fair to weak for it to actually do anything, but it started and ran.
So, with the knowledge of knowing it ran, I swaped the carb and inet to a HIF44 with a BBW needle and a Minispares inlet.
Fitted it all, nice and tight, all plumbed in... start to turn it over...
Coughs and splutters, all the time, no cosistant running, will only seem to fire if u keep turning it over, and opening the throtlle.
So checked all the timing, took the plugs out, making sure I had a spark, dryed the plugs, as they were wet... with the plug out, I turned the engine over to push out any excess fuel that might be in there. Replaced the plugs after giving them a small dose under a blow touch, and brush with a wire bursh. Replaced etc.
Sat there for about 5 mins making sure I knew the timing, even got the timing marks together, and looked at the rota arm, seeing where number one was....
Replaced it all back, in the correct order 1, 3, 4, 2.
Turned it over, had some shoot back out the carb, and a few pops down the exhaust, but still nothing. I know I am not 180* out, as I had it running before on the smaller carb...
Any ideas to what maybe the problem? Is there a way of telling if the carb is actually delivering fuel? (I do have oil in the carb btw)
HELP!!
Ta
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Post by dai9fxey on Mar 6, 2008 20:19:08 GMT 1
 Is the Vacuum pipe connection on the carb blocked off. 
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Post by Dog on Mar 6, 2008 20:25:40 GMT 1
It connected up  |
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Post by jc1380s on Mar 6, 2008 20:37:06 GMT 1
Hi Dog
You could try turning the mixture screw right down and then trying to start the engine.
When it doesn't start turn the mixture screw up 1/4 turn and try again.
Keep going until the engine trys to start then fine tune the mixture till correct.
jc
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Post by biker on Mar 6, 2008 20:38:07 GMT 1
have you tried adjusting the mixture. also what i,ve done in the past is put a little bit of fuel down the back of the carb (air Filter hole)
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Post by Dog on Mar 6, 2008 20:43:46 GMT 1
Yeh played with the screw...
Had it right in, and brought it back, till it was almost out... and back in again....
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Post by dai9fxey on Mar 6, 2008 20:56:31 GMT 1
Have you got the air filter on, otherwise the mixture will be too rich.
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Post by Dog on Mar 6, 2008 21:06:34 GMT 1
Nope, no air filter...
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Mar 6, 2008 21:13:58 GMT 1
could it just be a case of the engine being flooded ?
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Post by Dog on Mar 6, 2008 21:24:52 GMT 1
Well speaking to a friend of mine, the chap I acutally got the carb off, and he said swap the bodies over, and see what happens, as he had trouble a while back too... So going to swap it for another carb... Fingers crossed guys  |
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Post by dai9fxey on Mar 7, 2008 22:34:51 GMT 1
Any luck with the carb Dog.  |
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Post by Dog on Mar 7, 2008 23:51:45 GMT 1
Well took the carb off tonight, it seems theres no problem with fuel getting to the carb, as I had a pool of fuel IN the manifold! So its obvioues its over-fueling, so striped the carb down once again, checked everything, resealed, and fitted to inlet once again. I've also adjusted the ideal screw and mixture screws to Minimum (Lean and slow), will tweak each by a 1/4 turn each till its going, and adjust accordingly? Does the above sound like a game plan? Also, modified the inlet to actually let me fit it properly...   |
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Post by dai9fxey on Mar 8, 2008 9:20:14 GMT 1
Did you put the Fuel King on as well. Maybe the regulator is set too high. IE, Too much fuel being fed to the carb..  |
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Post by Dog on Mar 8, 2008 15:11:13 GMT 1
Aye its got the filter king on. Good news, and some bad news... It started! but just screamed!!! and had OVER 100psi oil pressure... (think I might take the oil cooler off...) while it ran, it just screamed then died... so I suspect it is the carb no doubt now. Also, my timing was a few degrees out, like 90 out lol AND, my timing cover is still fecking leaking Can't be arsed to suffer in the rain now more, so will do it tomorrow! |
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Post by Dog on Mar 8, 2008 15:11:44 GMT 1
Also... its on a mechanical pump, so I can't see how it would feed to much fuel...
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Post by jc1380s on Mar 8, 2008 15:26:24 GMT 1
It started! but just screamed!!! and had OVER 100psi oil pressure... (think I might take the oil cooler off...) while it ran, it just screamed then died... so I suspect it is the carb no doubt now. Also, my timing was a few degrees out, like 90 out lol You've got to sort the timing 1st Dog, maybe take the Oil cooler off for the time being. If you still have 100psi + with the cooler off it may be a blocked oil filter. How did it run with the other carb if the timing was out? Once you have the timing right, then screw down the mixture and tick over screws on the 1.3/4 and start again. One full turn from all the way down should be plenty on the tickover screw - you do not want that up too high. If all that fails go back to the earlier carb and get it running sweet with that one before trying the 1.3/4 again. jc |
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Post by dai9fxey on Mar 8, 2008 15:51:45 GMT 1
I still Don't understand why the engine would be screaming it's head off. The butterfly must be wide open for that to occur. Is the throttle return spring strong enough. |
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Post by jc1380s on Mar 8, 2008 16:06:12 GMT 1
OK. Stupid question time!!! You do have the fuel pipe going into the float chamber inlet pipe on the carb and not the overflow outlet, don't you? jc |
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Post by Dog on Mar 8, 2008 19:23:18 GMT 1
I certainly hope so...
Its in the lower most pipe, with a slight olive on the end?
Anyways, today - I braved the rain, mum as tea lady, and I managed to skin more knuckles...
Sorted - kinda the leak from the timing cover, removed oil cooler, and fitted another carb. Timing is set...
Now, it doesn't scream off, but yet a bit relutant to start... its turn over a few times, then shoot though the carb... and die... So I am guessing tappets might of settled a bit now... so going to check all the gap clearances tomorrow, and see what happens, but it does "sound" happier now... and oil pressure on crank over is now sitting just about 90psi.
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Post by dai9fxey on Mar 8, 2008 20:08:51 GMT 1
Well that's a step forward.  RE the timing, when the engine is at TDC is the No1 rocker closed.?? What I'm trying to say is, is No 1 valve closed ready for the FIRING stroke, rather than the Compression stroke. |
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Is the Vacuum pipe connection on the carb blocked off.
