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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through July 08, 2010 » Interesting hot start - 08 1125r « Previous Next »

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Mikellyjo
Posted on Wednesday, June 30, 2010 - 04:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you could be so kind as to roll this around your noodle a bit.

Problem: Bike won't start when hot and in gear.

Situation: Bike sits for 10 minutes after a minimum 10 minutes in town run. AT registering above 100deg F, in first gear, clutch lever pulled in to the grips, Switch set to run, yellow button pushed.

Outcome: Turns over and over and over but will not start. Stumbles like it's trying but no go.

Solution: put bike in neutral, push yellow button and she fires right up.

Why?

I'm not concerned as of yet, just curious as to what the link between the hot start issue and neutral versus first gear is.



Now in true smart @$$ fashion:

This doesn't make me want to join a class action law suit. And no I don't burn my legs because of this. Oh yeah, and I don't feel the need to buy a Busa to solve this problem either.
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Blk09r
Posted on Wednesday, June 30, 2010 - 05:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You might have enough clutch drag that the engine can't spin fast enough to fire. I don't know about Buell, but my Triumph had to be spinning above a certain rpm or it wouldn't kick over.
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Syonyk
Posted on Wednesday, June 30, 2010 - 05:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah, wet clutches have a non-trivial drag, especially with colder oil.

Also, after it sat, the fuel/air mixture was probably stupidly rich - the fuel in the intake will evaporate and fill the airbox. You may have also just sucked enough air through while trying to start in gear that when you went to neutral, it lit up. The "stumbling but not starting" would tend to support an overly rich mixture.
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1125rcya
Posted on Wednesday, June 30, 2010 - 06:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would try and adjust your clutch lever to #2 or 3 and maybe have your clutch bled out. Check your fluids all of them. Happy hunting
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Mikellyjo
Posted on Wednesday, June 30, 2010 - 11:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the input gents. Tomorrows hot day will be a trial and error day.
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Trafford
Posted on Thursday, July 01, 2010 - 02:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A simple solution might be don't startup in gear!! it also puts extra stress on the starter. More importantly the clutch neutral and first gear are all tied into the ECM. They alter the position of the AIC solenoid. Simple answer if you want to avoid the problem either change your ECM settings or start in neutral as the designers intended.
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Mikellyjo
Posted on Thursday, July 01, 2010 - 11:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

@trafford...90% of the time I start it in neutral so I am totally on board with that being a valid solution.

This is more of a curiosity then a problem...beside when you hood slide like Bo Duke for a fast getaway sometimes I forget ; )

With regards to proper starting per the designers intent...well straight out of the 08 manual you are given two options for stating:

NOTE:

Buell motorcycles feature a starter interlock. Before starting the engine, all the following conditions must be met.

* Engine OFF/RUN switch on right handlebar control group must be in the ON position.
* Clutch lever must be applied (pulled-in) before starting motorcycle in gear. Note that it is not necessary to apply clutch lever before starting the vehicle in neutral.

Apparently according to the manual, the only reason to not start it in gear would be the tendency for it to lurch forward if the safety failed.
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Froggy
Posted on Thursday, July 01, 2010 - 05:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

All my bikes are harder to start in gear, so I do usually start in neutral. But your bike sounds like its a bit harder to start than what mine do.
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Boogiman1981
Posted on Thursday, July 01, 2010 - 05:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

yeah i think it's the drag thing all mine are harder to start in gear with clutch in. they usually will start but are slowly/less happy about it
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Mikellyjo
Posted on Thursday, July 01, 2010 - 07:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well it appears all of our bikes share similar woes...but each one to a different degree. I had the day off today so I did a little investigating with the above suggestions. Plenty warm and every time a hard start. So, here is how my 1125r reacted.

1125rcya: I would try and adjust your clutch lever to #2 or 3 and maybe have your clutch bled out. Check your fluids all of them.

Fluids are good, bled the clutch just to be sure (blinker fluid a tad low), tried position 2

Great place to start but alas no change.

Syonyk: Also, after it sat, the fuel/air mixture was probably stupidly rich - the fuel in the intake will evaporate and fill the airbox

Agreed..the air fuel mixture probably is stupid...just don't know whether rich or lean. I Took the air box/air filter off before trying to start it and she acted the same...great suggestion though, I found a collection of moths on under tho hood.

So far I am leaning toward those who have suggested drag on the clutch when hot. If I could find a way to cool the clutch fluid right after the drive I would test that theory too.

Thank you once again gentlemen for the shade tree advice. With out it I would have to leave my bike at the shop for copious amounts of time to have the techs do this.

Lastly, to Mr. Trafford...the neutral start is definitely the way to go for this particular beast on a hot day.

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Smit3833
Posted on Thursday, July 01, 2010 - 11:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have an 08 1125R and it simply does not like hot starts. Running at the drag strip is terrible when I shut it off for 10 minutes then try to start it again. It will take two or three times cranking before it turns over. Don't give it gas and it will start easier.
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Mikellyjo
Posted on Thursday, July 01, 2010 - 11:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Oh yeah, I made the mistake of giving it gas like it was an old carb'd bike...that with definitely make it stupid rich. Even got a back fire from that time.
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Therealassmikeg
Posted on Friday, July 02, 2010 - 06:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I wait till the cel goes out on the ipack before I attempt start up.
Fires up first time every time that way
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