2025 rocket 3 prolonged occasional starting.

mo8414 · Saturday at 11:47 AM

sepfj said:
Mine does that every now and then. Not sure if it's the same issue, but sometimes when I hit the starter it cranks over fine but won't start. If I let up on the start button and then press it the second time it always starts instantly. It's almost as if something in the ignition circuitry isn't turning on with the first press of the button but works fine on the second press. I've just gotten used to it and now if it doesn't start immediately on the first press I just let up and hit it again and it always fires right up the second time.

Yup exact same condition. I tried to ride it out a bit longer this time than I did last time and it still took me having to hit the start button twice and sure enough the second time it instantly started. Tobad the plugs arent easier to get to you could clamp the plug wire with a timing light and see if its firing.

mo8414 · Saturday at 11:56 AM

BrewinProf said:
Could it possibly be the fact that you use premium gas? Unless you have a tune these bikes are made to run off of regular unleaded. If I fill up at a discount gas station I use mid grade but have never tried premium and have never had the issue you are reporting.

I have read that in other treads as well I just dont know why hitting the start button a second time would make it fire without fail if it was just having a hard time igniting the fuel. Maybe ill try mid grade for a bit and see if there is a difference. I'll be sure to update in either case.

mo8414 · Saturday at 11:57 AM

Ill giv

atomsplitter said:
One thing you can try (and it's free) is when you click the rocker to ON and hear the fuel pump prime, give it an extra 4 seconds before hitting START. It could be simply the fuel rail isn't suffiecently pressurized before you hit the start switch.

Ill give it a shot

mo8414 · Saturday at 11:59 AM

sandcritter said:
Noticed the same. Always starts, but maybe 1:10 it’s a 2-, almost 3-sec chugga-chugga and a puzzled look. Seems to be on cool mornings (40’s, 50’s), so i chalked it up to running 15w50. Maybe that’s not the cause; don’t know. New bike, 8800mi

Glad to see im not the only one at least.

Journeyman · Saturday at 1:35 PM

BrewinProf said:
Could it possibly be the fact that you use premium gas? Unless you have a tune these bikes are made to run off of regular unleaded. If I fill up at a discount gas station I use mid grade but have never tried premium and have never had the issue you are reporting.

Most of us run premium. Here's a long thread on the subject....

Run premium fuel?

I've always used premium (91 R+M/2 in Arizona) and been happy with the performance over the past 7k miles. Just idly flipping through the manual though and I noticed it only calls for 87 knock index fuel. When I purchased, my service manager was adamant to use premium fuel. Does anybody run...

www.r3owners.net

Einar · Saturday at 2:30 PM

Forgot to mention earlier, that I also got in there and seated the spark plug wires that were all just sitting atop the plugs rather than pushed down onto them. Didn't help.

sandcritter said:
Noticed the same. Always starts, but maybe 1:10 it’s a 2-, almost 3-sec chugga-chugga and a puzzled look. Seems to be on cool mornings (40’s, 50’s), so i chalked it up to running 15w50. Maybe that’s not the cause; don’t know. New bike, 8800mi.

From 10 F through 100 F (-12 to 38 C), it's always the same for me.

atomsplitter said:
One thing you can try (and it's free) is when you click the rocker to ON and hear the fuel pump prime, give it an extra 4 seconds before hitting START. It could be simply the fuel rail isn't suffiecently pressurized before you hit the start switch.

Yeah, I've tried that several times. No effect.

BrewinProf said:
Could it possibly be the fact that you use premium gas? Unless you have a tune these bikes are made to run off of regular unleaded. If I fill up at a discount gas station I use mid grade but have never tried premium and have never had the issue you are reporting.

I normally run 89 and have tried 87, neither of which made a difference.

arnaudth · 2025-08-24T04:37:49-0500

mo8414 said:
Recently I notice if I let my bike sit for a day then try to start it, it won't start right away. I have to hit the start button twice for it to finally catch. I have 1600 miles on the bike. I,ve had the bike about a month now.

I use premium gas and all fluids are where they should be. I have had it happen twice so far. I typically ride it to work everyday and will go for a night ride and never have the problem untill I have to leave it sit due to it raining that day. Anyone ever experience this? Seems like the second time I go to start it after the prolonged first attempt it catches right away.

Hello I have the same problem. Please see this link: 2020 Rocket 3 GT won't start first go when cold

Chuck05 · 2025-08-24T11:37:28-0500

How do I adjust the idle speed on my 2005 Rocket 3

TURBO200R4 · 2025-08-24T12:58:57-0500

Chuck05 said:
⁹How do I adjust the idle speed on my 2005 Rocket 3

First you need to introduce yourself on the introduce forum
Second this is the 2.5L forum not for early bikes
Third that is going to be a long answer.
You will be welcomed when you sign in.

imcool · 2025-08-25T12:41:47-0500

mo8414 said:
Recently I notice if I let my bike sit for a day then try to start it, it won't start right away. I have to hit the start button twice for it to finally catch. I have 1600 miles on the bike. I,ve had the bike about a month now.

I use premium gas and all fluids are where they should be. I have had it happen twice so far. I typically ride it to work everyday and will go for a night ride and never have the problem untill I have to leave it sit due to it raining that day. Anyone ever experience this? Seems like the second time I go to start it after the prolonged first attempt it catches right away.

yes, that is correct, this happens and not sure why, as I have tried priming fuel injector until they stop priming and then give an engine start but it does that sometimes and there is no pattern in regards to temperature or anything else.

2025 rocket 3 prolonged occasional starting.

mo8414

.020 Over

mo8414

.020 Over

mo8414

.020 Over

mo8414

.020 Over

Journeyman

"And this one is just right" ~ Goldilocks

Run premium fuel?

Einar

Supercharged

arnaudth

Standard Bore

Chuck05

Standard Bore

TURBO200R4

stand up straight and grab the world by the a$$

imcool

Turbocharged

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