HELP! Fuel/ TPS/ igniter/ stalling issue - Wrist Twisters
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post #1 of 11 Old 04-13-2018, 06:22 AM Thread Starter
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HELP! Fuel/ TPS/ igniter/ stalling issue

Hi all! I’m seeking your help with a dreaded fuel issue. Let me start from the beginning...

This is the second 919 I’ve owned because I love them so much. I picked up this one (2002) with less than 10k miles in great condition for $1800. The kid I bought it from claimed to be a bike mechanic(doubtful) and jimmy rigged a different Throttle position sensor(TPS) on it. It ran fine if you were light on the throttle, but if I really tried to get after it, it would die and throw an F1 light. Well he included a used throttle body assembly and I took the right TPS off the extra throttle body and tuned it to perfection. It ran fine for a couple months prior to winter and I winterized the bike and put her in for the season.

Fast forward to a couple weeks ago. I got the bike out for the first time and it started running really rich. I rode it around for a couple hours and it acted like it did when the wrong TPS was on there. I checked the voltage on the TPS and it was within specs both open and closed. Then I was on the highway a couple days later and it wouldn’t rev higher than 4500rpm and bogged down whenever I tried to go faster. Long story short, I had to get my brother to pick me and the bike up on the side of the highway and now I’m working on a fix.

The bike starts after a few seconds of struttering and will idle like a champ, although it does smell super rich. If I slowly roll on the gas, it goes through the full RPM range. If I try to crank the throttle fast, it instantly dies.

Here’s what I’ve done:
Checked voltage on TPS - good
Replaced fuel pressure regulator - no change
Replaced spark plugs - old plugs looked relatively clean. No change
I’m in the process of getting the pump and filter out of the tank to change the fuel filter. If that doesn’t work, I’m kind of at a loss. Has anyone else experienced this issue and have experience? Could it be faulty igniters? Any other suggestions would be a huge help because I’m at a complete loss

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post #2 of 11 Old 04-13-2018, 11:43 AM
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Check your fuel return line. Make sure it isn't blocked/kinked. Maybe check your vacuum hoses for a leak/crack. When you fitted your pressure regulator did you remove the rubber plug underneath it? Are your coils good? Do all the headers heat up evenly when you start your bike? Seems likely it could be tps related cause of your history. I did find some new/cheap aftermarket tps that work fine. Also seems strange things went bad after sitting.
Good luck.
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post #3 of 11 Old 04-13-2018, 12:02 PM
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Also make sure your tank is venting properly. Maybe try running it with cap just open. I'll keep thinking on it.
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post #4 of 11 Old 04-14-2018, 02:13 AM
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I don’t suppose it also has an apparently wonky speedometer, does it?

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post #5 of 11 Old 04-14-2018, 05:32 AM
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Have you checked the air filter? When buying used I'd start with the simple stuff first. If it's rich fuel doesn't seem to be an issue.

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post #6 of 11 Old 04-16-2018, 09:57 AM Thread Starter
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Quote:
Originally Posted by HondaJim View Post
Have you checked the air filter? When buying used I'd start with the simple stuff first. If it's rich fuel doesn't seem to be an issue.
Checked the air filter, lines and return. I also made sure the pressure regulator was installed properly. I ended up taking the pump/ Filter out. I just bought a new fuel filter ($58 &#x1f621 and I’m about to install it tomorrow. I’ll keep y’all posted on what I find out

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post #7 of 11 Old 04-16-2018, 06:06 PM
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Maybe cut your old filter open and see what crap it has filtered out.
It might be your filter but my bike had a very rusty tank when I got. It ran fine, bit rough down low, but It rev'ed out well. When I replaced both pump and filter I cut the old filter in half. It was practically blocked with a fine rust mud. Absolutely filthy, yet the bike still ran OK with that very dirty filter.
My point is, I doubt it will be the filter. I hope I'm wrong. Also why go bad just sitting?
Maybe it's the fuel pump. You can pick up a non OEM fuel pump very cheap, less than the filter you just brought. Maybe give one of them a go if the filter swap doesn't work.
Perhaps swap out the TPS again.
Definitely keep us posted, sux when people just drift away without giving a end result. Good luck man.

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post #8 of 11 Old 04-25-2018, 09:56 AM Thread Starter
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Replaced the filter (it needed it bad) and it runs better, but not great. Determined that it was the “new” tps faulty as well. Anyone know where I can find one by itself? Finding a new condition tps for a 919 is like finding a needle in a haystack...

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post #9 of 11 Old 04-25-2018, 10:29 AM
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I brought three aftermarket TPS's for about $60 aud. Chinese. Fit and work perfect. I wanted a spare. One has been on my bike for about 6mths and has worked flawlessly. Most of that $60 was freight since the company wants to sell bulk. 5 TPS units was $75 aud. 10 units was $100. The freight was a kilo rate. I only wanted one but had no trouble getting rid of the other two.
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post #10 of 11 Old 04-25-2018, 10:32 AM
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post #11 of 11 Old 05-12-2018, 06:33 AM Thread Starter
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Update: found a used throttle body off eBay for $100 and offered the guy $50. He took the deal! The TPS is the right one and works great. FINALLY have a good running bike. Now it’s time to start repainting the bike 😏

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