Have you tried to bump start your TR650?

The other day I tried to roll start the TR and it would not fire. It turned over but seemed like it wasn't getting fuel.

Is this so on all TR's?

It depends on why you needed to bump start it. If you had a dead battery then yes it won't fire because the fuel pump needs juice to work and squirt fuel. It's not like carburetors where vacuum does the fuel pumping for you.

But, if you had juice then why did you need to bump start it?

Sort of a catch 22.

That all said--I do know that if you're at road speed with a charged battery, pull in the clutch (I was curious), turn off the ignition, turn it back on, and let out the clutch...it sort of hesitates a bit but then eventually fires. It doesn't seem to act quite the same way as a carbureted bike in my experience.

I just wanted to see if it would bump start. Tried it twice rolling down hill at low speed, just didn't seem to be getting fuel. Reason was to see if I was out and had a low battery if I had a back up plan or if starter failed.

I have had the bike stall coming to a light and let off the clutch fired right up for me. I did have the ignition on and the kill switch off as you would if it was running.

I had a low battery (10v) and would not start with electric start. So I rolled the bike forward in 1st, kick-stand up, and pushed the starter and it fired. Not a true bump start because I had the clutch pulled in but some how rolling the bike forward assisted in the start-up.

OK, it's just me then. I had everything in a run setting it just would not fire. Hit starter button and it fired right back up. I will have to try again and see.

I am very curious about this, specifically what is the threshold of low voltage in your battery where the immobilizer circuitry could not be overcome? I know on an EFI bike you need enough poop to operate the fuel pump and the injectors. I think on many bikes, a turning alternator can produce some charging amperage, but you might need some activating current for that to work unless it has permanent magnets. If you can't get the bike enough juice to allow it to recognize your key, all the bumping in the world may not work.

I have no idea what will happen in the event of a totally flat battery. I have thought about making a tiny battery pack out of D-Cell batteries with a connector that plugs into my Battery Tender plug solely for the purpose of providing enough power to make the ignition come alive. I have made a jumper wire for this though, so I can hook it up to a buddy bike and let his battery charge mine until I get enough juice to be able to overcome the immobilizer, run the fuel pump, and then bump start as a last resort.

BTW, this is the prime scenario for why I should add a switch to turn the headlamp off when needed.

If you only need the switch for situations like that, isn't it easier just to pull the headlight fuse while you start it ?

Great idea. I ignored the obvious. Kudos to you.

I bump started mine in 3rd gear just fine, the other day.....just to see if I could. Downhill roll on a long concrete driveway. Piece of cake! But, that's with a good battery too.

HF

Choose a higher gear and bounce the suspension with all your bodyweight and drop the clutch as the suspension is reaching max compression. Be ready to pull the clutch in right away if it does fire to stop it stalling.

I bump start mine all the time. Mostly because I kill it all the time off road stopping at the crest of a hill. Forget about first. Second or third is cake. Works is dirt, sand whatever. No starter button needed.