andyfiggy2002
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| posted on 18/7/14 at 10:46 AM |
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93 Carbed Blade won't start when hot
Runs & started fine hot or cold last 10 years, in April replaced Pipercross open air filter with pipercross air box/ filter combi to get induction
DBs down for spa & the ring. Gave it the beans & Engine behaved flawlessly at spa/ ring where temp got up to sunny 17 degrees.....however ever
since I've been having hot start problems? Have I overcooked something I ask??
Symptons...when engine is hot like after I've filled up with fuel or I've left it standing for 10 mins after a blat it's a real
bitch to get going, sometimes will catch & fire up really reluctantly using plenty of right foot peddling or if battery exhausted I have to get
out & bump start. Starts fine if I let it cool down for a couple of hours or when it's cold then it just needs a little choke in this hot
weather to start 1st time. Fitted new battery, coils, HT leads, plugs....battery charging ok. Honda Fuel pump seems to prime & run ok. Fan kicks
in as normal & gauge indicates nothing abnormal. No hiss when I open up fuel cap indicating breathing ok. Carb bowls drain ok, only thing is it is
a bit lumpy on idle which I suspect carbs need synchro. Oil press seems lower than normal so maybe I have over cooked it but no excessive smoke of any
kind out of exhaust & engine still pulls like a train, oil consumption still frugal, plugs normal tan colour however when cold I pulled all ht
leads & turned engine over I expected to see wet plugs but didn't?? Fitted leads again & started ok???? ... I now dread filling up for
petrol....Plse help anyone
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johnnybizzle1986
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| posted on 18/7/14 at 11:50 AM |
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Hi,
Ive got an 89 cbr1000F engine in my haynes roadster, and I had the same problem, I'm putting it down the the engine been old/tired and having
low compression (about 25k miles on the engine) I put a MotoBatt battery on it with a bit more cranking power and trimmed the ends of the HT lead as
mine were a bit knackered and it seems to work for now.
have you tried going back to your old air filter/airbox setup, might be abit lean at tickover or something?
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teegray19
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| posted on 18/7/14 at 12:15 PM |
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Regulator/rectifier problems? Seems to be a common Honda fault..
Built Formular 27 with 1600cc crossflow, 1700cc 0 miles crossflow, Kawasaki ZZR1100
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andyfiggy2002
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| posted on 18/7/14 at 12:36 PM |
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Dynojetted so carbs have been up jetted, motobatt is fitted & did oil & plug change when got back to UK, would burnt valves make it difficult
to start when hot? But no smoke or noise, oil & fuel & coolant consumption ok
& has PC fan blowing on cbr1000 reg/rec, battery is charging, fuel pump runs ok & starts from cold ok?
andy bates, where are u....lol
[Edited on 18/7/14 by andyfiggy2002]
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teegray19
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| posted on 18/7/14 at 01:00 PM |
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Have you done a compression test?
Haynes manual will tell you the limits, do the test WOT rules out valve cylinder problems then? Halfrauds normally have the kits in for 20/30 quid
Built Formular 27 with 1600cc crossflow, 1700cc 0 miles crossflow, Kawasaki ZZR1100
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40inches
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| posted on 18/7/14 at 01:02 PM |
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Mine does almost exactly the same thing, but switching the ignition off then on, it fires up straight away 
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andyfiggy2002
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| posted on 18/7/14 at 01:10 PM |
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Would low compression make it hard to start from hot but not affect performance or cold starting?
& I assume ignition switching trick is turning fuel pump on/off therefore giving a bit more pressure?
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40inches
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| posted on 18/7/14 at 01:15 PM |
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quote:
Originally posted by andyfiggy2002
Would low compression make it hard to start from hot but not affect performance or cold starting?
& I assume ignition switching trick is turning fuel pump on/off therefore giving a bit more pressure?
If I keep trying to start it, there is a strong smell of petrol, switch ignition on/off it fires with a bang in the exhaust
If it doesn't fire first time, ignition trick and it fires immediately. Weird!
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andyfiggy2002
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| posted on 18/7/14 at 01:57 PM |
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No smell of fuel but sometimes I get a backfire when I've struggled to start it hot, self regulating fuel pump on its last legs maybe?
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teegray19
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| posted on 18/7/14 at 03:49 PM |
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I bet it's the fueling being thrown out by the new induction set up.
Return to old set up, if it's sorted get the carbs set up again.
You could try a pump and igintion switch but nothing's been changed there so seems strange.
Mine was running mega ritch with a differ t air box on, rejetting and correct air correctors sorted all starting running issues.
And more power! Worth a try.... Might be running leaner with differnt airbox. Running hotter, harder to start?
My ten pennies worth.
Built Formular 27 with 1600cc crossflow, 1700cc 0 miles crossflow, Kawasaki ZZR1100
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mark chandler
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| posted on 18/7/14 at 04:49 PM |
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When I removed the original filter on my 893 it ran badly, doing the exhaust just made it worse until I fitted a dynojet kit which resolved things.
They can be very temperamental to start, filling the gap on the plugs helped mine, have a google you file the tang so it only covers half the
electrode which provides a less shrouded spark.
Duff plugs will stop them dead.
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andyfiggy2002
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| posted on 18/7/14 at 06:26 PM |
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That's annoying, I stuck pipercross air filter back on & it has cured the problem I guess a bit like having a winter & summer setting on
your air filter on an ordinary production car, spa/ ring in April was 1 degree at night & 17 degrees during day so not as hot as it is here in UK
this humid summers day. oil press gone up to which is a bonus. So any ideas how I can use this air box in summer to quieten down induction noise
considering I've got 132 jets in already or can I only use it during winter?
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40inches
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| posted on 18/7/14 at 06:55 PM |
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quote:
Originally posted by andyfiggy2002
That's annoying, I stuck pipercross air filter back on & it has cured the problem I guess a bit like having a winter & summer setting on
your air filter on an ordinary production car, spa/ ring in April was 1 degree at night & 17 degrees during day so not as hot as it is here in UK
this humid summers day. oil press gone up to which is a bonus. So any ideas how I can use this air box in summer to quieten down induction noise
considering I've got 132 jets in already or can I only use it during winter?
A rolling road session will sort it out. Bike carbs can be very sensitive to any change, it needs setting up for your new induction.
Mine won't start without a silencer fitted 
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rick1962uk
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| posted on 18/7/14 at 07:04 PM |
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have you checked the valve clearance
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andyfiggy2002
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| posted on 18/7/14 at 09:50 PM |
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Ok comments noted & appreciated guys
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