StevieB
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| posted on 31/1/09 at 09:10 PM |
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R1 Running rough
Evenin' all!
Well, I'm nearing completion of my build and am now in the final snagging stages.
I'm having a bit of an issue with getting my engine to run smoothlyt though:
A few engine facts first:
'00 5JJ enigne on carbs
TTS sausage filter
TTS needles and jets, needlesset at the second groove from the blunt end of the needle (as recommended by TTS - 1 groove in from maximum lean-ness)
It's difficult to start (even allowing for the fact it's cold). If I give it full choke, it starts eventually, the revs go up to about 3k
and then wind down till it dies out.
with a bit pf perserverence I can get the engine to tick over, but at first it's really rough until it all warms up and settle down (I mean
really, really rough!). When cold, snapping the throtlle open results in the engine cutting out completely with a bit of a cough from the carbs.
Does anyone have any thoughts?
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sonic
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| posted on 31/1/09 at 09:18 PM |
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Hello
I have a 2001 5jj in mine and had exactly the same problems.
Your problem is the carbs need cleaning,especially the jets.
Mine had the same problem and it was running on 2 cylinders.when its running for a while touch the exhaust headers one by one and see how hot they
get,i could bare my hand on two of them and the other two were red hot.
Cleaned all the carbs and jets and put a dynojet kit in it and it ran on all cylinders.
The slightest bit of muck will cause it.
Get a good fuel filter after you have cleaned them.
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Coose
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| posted on 31/1/09 at 09:44 PM |
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Yep, that's the first place I would start old bean, and check the float heights at the same time. Also, check the state of the fuel filter.
Spin 'er off Well...
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locoR1
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| posted on 31/1/09 at 09:45 PM |
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As sonic says carbs need to be spotless slightest bit of dirt or corrosion and you will have problems another thing to consider is plugs, bike engines
seem to have a habit of eating plugs if you continually run them without actually taking them out for a proper run.
 
Description
Check out my CB500T Cafe Racer build diary
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StevieB
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| posted on 31/1/09 at 09:53 PM |
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Cheers for the replies
(evenin' Coose - how's things old chap?)
I've recently replaced the plugs as they were gopping.
I've also replaced a throttle valve as on of the plastic needles retainers had snapped off (not a cheap thing it seems!)
I'llpick up som fuel filters next weekend and stick a fresh one on and put one in between the pump and carbs for good measure.
Di you reckon I'll get away with some carb cleaner spray in stuff?
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sonic
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| posted on 31/1/09 at 10:09 PM |
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Nope!!!!!!!!!!!!!!!
Tried that,it wasnt that difficult to take them apart and clean really
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StevieB
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| posted on 31/1/09 at 10:16 PM |
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Always looking for an easier way out...
I have to assume the jets are OK as I fitted new jets from TTS (and blocked off the others, as per TTS instructions).
This is bloody annoying - for all intents and purposes my car is finished, but as I go round it picking up all the little faults and niggles, I keep
having to take more parts off it. 
Still, I'll get it all sorted sooner or later 
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Coose
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| posted on 31/1/09 at 11:02 PM |
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Evening old bean, all is grand ta! How's doo and are you coming on FBB?
You did block off the correct air jets, didn't you? You don't block off the ones that are screwed in, but the ones that are pressed in.
Just a thought.....
Spin 'er off Well...
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StevieB
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| posted on 31/1/09 at 11:15 PM |
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All's well at this end ta!
I'll be on FBB by hook or by crook, and in one car or tother! Are Mr J Jnr and youself going to be forming a small but dangerous outlaw biker
gang for the duration? I reckon I must owe you a fair few pints by now for all the help you've given me to date!
I blocked off the pressed in jets as there wouldn't have been anywhere else to screw in the main jets.
Mr J has suggested the problem I have could also be an air leak and to also check the air/fuel mix too.
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Coose
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| posted on 31/1/09 at 11:45 PM |
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Grand stuff! Yep, Dug and I have signed up.....
Right, I'm a bit concerned now. Where you said "I blocked off the pressed in jets as there wouldn't have been anywhere else to screw
in the main jets", does this mean that you blocked off jets INSIDE of the float bowls? The four air jets that should be blocked are the
pressed-in jets on the inlet side of the carbs, the end nearest the air filter. The main jets replace the existing inside of the float bowl.
The chance of an air leak is pretty slim, so long as your inlet rubbers (carb-to-head) are in good condition, the carbs are properly home into the
rubbers and the clamps are tight. The only other place that there could be a leak is if your carb balancing grubscrews are loose in the head, or if
you have forgotten to block off the vacuum tap takeoff on the head (on the inlet nearest the rear of the car).
The air screws (air/fuel mix) are easy enough to set - screw them in until they're fully home, then screw them out by 3 1/4 turns.
The carbs could be miles out of balance I suppose, which could make it run pretty awfully. The easy way to get it somewhere near is to lift each slide
up in turn (with the engine off of course) and check that each butterfly is sat in a pretty similar position. The chances of the carbs being THAT far
out are pretty slim though...
Hope this helps!
Spin 'er off Well...
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001Ben
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| posted on 1/2/09 at 09:12 AM |
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which hole
I have a similar setup to yourself and found that I had to use 35 jets as it was overfuelling
[Edited on 1/2/09 by 001Ben]
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StevieB
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| posted on 1/2/09 at 09:38 AM |
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Hole number 1.
Don't be too concerned Coose - I did the jets immediately after you'd shown me (the same day I got my lesson in soldering pipes ). I
did them stright away so as not to forget anything
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