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Started Bike on Large Throttle Opening by Mistake
#781114 08/10/19 6:11 pm
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In my other thread I said how I checked my needle position. Well somehow the throttle was jammed a way open. I forgot to check that it was shutting ok like normal. Anyway I was going to strobe it but went to high revs so I turned the ignition off after frantically trying to close the throttle. It was only a few seconds but I am hoping it will be ok. I tried the twist grip when all was quiet and found that it seemed to be opening and snapping shut but only had half its normal travel. After checking the needle I had done this a couple of times but didn't notice. It started again normally once I had fixed the carb

I spend most of my life kicking myself after doing a series of daft things. This whole episode was pointless and all because I couldn't remember the needle position I had it in!

Dave (still in tears)

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Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781119 08/10/19 7:02 pm
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Most of the damage was likely to your BVD's, just sayin.....If it doesn't knock or smoke afterward, you're probably good to go after a change in underwear.
You might have taken some miles off the lifespan of your rings, perhaps?
Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781125 08/10/19 7:46 pm
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Have to agree with Bill. I think we've all been there. You most likely got more stressed than the bike did.

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781126 08/10/19 8:19 pm
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Will strobe it (low revs points version!) tomorrow and try it out.

Dave

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781130 08/10/19 9:49 pm
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I did the same thing but I was riding at the time. I missed a shift with full throttle on and I broke 5 out of 6 rings into dozens of pieces. It was on my Norton, but same same.
It's likely to do damage to a bike with some miles on it rather than a new motor. The taper of the bore is hard on rings which get compressed then un-compressed repeatedly thousands of times per minute.
The over-rev was all it took to destroy my rings.
Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781139 08/10/19 10:42 pm
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Cobblers, I very much doubt that you've done any significant damage whatsoever.

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781162 08/11/19 6:01 am
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Pretty much SOP on anything with Mk2 Amals or Mikunis. If it doesn't fire in two tries with the cold-start on you must open the throttle.
Not a problem as far as I know.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
Re: Started Bike on Large Throttle Opening by Mistake
DavidP #781168 08/11/19 7:07 am
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Originally Posted by DavidP
Pretty much SOP on anything with Mk2 Amals or Mikunis. If it doesn't fire in two tries with the cold-start on you must open the throttle.
Not a problem as far as I know.



On anything with a flooded engine, although in those cases by the time it starts your able to close the throttle down again.


beerchug

(Display name changed for cyber security reasons)

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781173 08/11/19 9:37 am
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Well....that takes care of the running in phase..... laughing laughing

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781178 08/11/19 11:08 am
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Yes I think the rings should be well bedded in now. Joking aside it is a good job it isn't a new engine. Mind you, do people rev a new engine up to strobe the timing with ei or do they wait until it is run in a bit?

Dave

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781183 08/11/19 12:07 pm
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It was not under load so very unlikely to have caused damage.

Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781190 08/11/19 3:46 pm
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Pazon instruction says to time at a few degrees retarded at 3K rpm if you do not want to take a new rebuild to 5K.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2018 Kawasaki Z900RS


Everything will be alright in the end. If its not alright, its not the end.
Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781191 08/11/19 4:00 pm
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Strobed it up to 38 degrees at about 2500 rpm, took it out for a run and it bombed along as normal, thank goodness.

Last edited by dave jones; 08/11/19 4:00 pm.
Re: Started Bike on Large Throttle Opening by Mistake
dave jones #781214 08/11/19 9:28 pm
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They're tough old things, T140 engines!


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