G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile

Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » Archive through October 09, 2014 » Batery and push start « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Pontlee77
Posted on Monday, September 15, 2014 - 02:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

By mistake i turned of the bike on the parking position? Where the short beam stays on, so after 3-4hours the battery was with hardly any charge, i tried a push 2nd gear start the bike started i pulley the clutch to engage 1st but engine stalled.
So i'm questioning why did it stall?

The bike is back home and i charged the battery and all is back to normal?

Thanks.
Top of pagePrevious messageNext messageBottom of page Link to this message

Reepicheep
Posted on Monday, September 15, 2014 - 03:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dunno. Maybe the engine speed (meaning low stator output) combined with the low battery meant there wasn't enough power to run some critical component very well, and the result was the odd symptom you observed.

I can't tell you what low voltage will do to a particular bike, but I can tell you it will probably be really weird whatever it is.
Top of pagePrevious messageNext messageBottom of page Link to this message

Callawegian
Posted on Monday, September 15, 2014 - 09:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I bumped started my 06 twice in the same day and I had no problems. Battery was going bad and hold a charge for long periods of time
Top of pagePrevious messageNext messageBottom of page Link to this message

Tempest766
Posted on Tuesday, September 16, 2014 - 11:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I didn't think it was possible to bump start an EFI engine at all with a totally dead battery. I thought you needed some charge for the injectors to work properly and the ecu to have power...thus the apropos statement that modern engines are nothing but boat anchors without an ecu.
Top of pagePrevious messageNext messageBottom of page Link to this message

Arcticktm
Posted on Tuesday, September 16, 2014 - 01:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You can start an EFI this way, if it is designed appropriately. You don't even need a battery in some cases.
You need to get enough RPM into the system so there is enough juice being generated to power the ECU.
That can vary a lot based on ECU and the electrical system.
Arctic Cat used to make a lot of 2-stroke snowmobiles that were EFI and had no battery at all in them. Pull start only, which isn't any different to the engine than making RPM by pushing it in gear.
Their key (vs competition that needed a battery) was getting enough electricity to wake up the ECU. They did this by making an appropriate ratio of the recoil starter to the engine RPM. IIRC they needed something like 300 RPM to make the computer function on those sleds. It worked very well.
Top of pagePrevious messageNext messageBottom of page Link to this message

Froggy
Posted on Tuesday, September 16, 2014 - 02:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


quote:

So i'm questioning why did it stall?




My theory:
Squeezing the clutch lever dropped the engine RPMs, lowering the amount of power being generated by the stator. You dropped voltage to the point that something in the EFI (likely the fuel pump) cut out again, resulting in a stall. If you just rode it out or downshifted without letting the RPMs drop it likely would have kept running


quote:

I didn't think it was possible to bump start an EFI engine at all with a totally dead battery.




This basically is the case. There is a difference between too dead to start and totally dead. In the OPs case, it was too dead to start, but had enough juice to at least get the fuel pump primed.

If it is totally dead, it still is possible to push start it, it just will take more effort as you need to be going a bit before there will be enough power for it to take over.
Top of pagePrevious messageNext messageBottom of page Link to this message

Pontlee77
Posted on Tuesday, September 16, 2014 - 02:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for all the replies.
Top of pagePrevious messageNext messageBottom of page Link to this message

Ratbuell
Posted on Wednesday, September 17, 2014 - 08:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Turns out your friend here is only...MOSTLY dead."

Sorry.

Had to do it, since all the "real" answers are already posted : )
Top of pagePrevious messageNext messageBottom of page Link to this message

Tempest766
Posted on Wednesday, September 17, 2014 - 01:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Bye,bye boys! Have fun storming the castle!
Top of pagePrevious messageNext messageBottom of page Link to this message

Natexlh1000
Posted on Wednesday, September 17, 2014 - 01:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Think they'll make it?"
Top of pagePrevious messageNext messageBottom of page Link to this message

Reepicheep
Posted on Wednesday, September 17, 2014 - 01:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"I have a surprise. I am not left handed!"

(My daughter is turning into a really good Lacrosse player. We use that line all the time when she is playing a group of girls that she can score on at will, we make her do everything off-hand).


airaudrey


Um, what was the topic again?
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a private posting area. Only registered users and custodians may post messages here.
Password:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration