Sporadic Start Failure ( NOT "hard-start" issue....)

Tenman

Well-Known Member
Joined
Dec 7, 2013
Messages
1,549
Location
Natchez Ms USA
I had a warm hard start on my gen1 on a hot rainy day about 2 years ago. I pulled in front of a hotel entrance to put on a rain suit. I got ready to go and had an embarrassing hard start. I let it sit for about 10 minutes and held it wide open and it cough a time or 2 and redlined. I took it home and cycled the key at least 10 times and it fired right up. I killed it and cycled it about 20 times and it farted a couple of times. Then fired up and ran perfect.
 

sandro1973

Member
Joined
Jan 26, 2018
Messages
59
Location
Portugal
Here's some feedback from my mechanic....he thinks this "on / off" of the engine when cold, can be related with not enough pressure on the fuel pump on some random cold starts.

So, as a fail-safe on cold mornings, he suggested cycling the key twice, in order to create additional pressure on the fuel pump. I tested it today and will do it in every cold start morning in the winter, if the issue disappears, all good, "mistery" solved. Anyway, he'll test the pressure next time i take my bike to the shop.

 

StefanOnHisS10

Converting fuel into heat, noise and a bit motion
Staff member
Global Moderator
Joined
Apr 8, 2020
Messages
1,002
Location
The Netherlands, Friesland.
I did find out that when the tank is full there is no problem for me. That would suggest lack of fuel too. Just waiting to see if it re-apears when the tank gets more empty.
 

Rare1

New Member
Joined
Sep 28, 2021
Messages
6
Location
Ontario, Canada
I have been using SeaFoam injector cleaner for the last 3 fill-ups. Silly bike, it has been starting and staying running now for the last 2 weeks. The garage temperature has dropped substantially in the last 2 weeks since Fall is officially here. The garage is insulated and has a Garaga insulated door so keeps the temps around 13-15 C.
I will put it on my list to have my mechanic check the valves and decompressors in the Spring since the riding season is almost finished for me. I do not have a heated suit or vest and at my age I do not have any reason to expose myself to too much hardship. I have a 3 Season suit and did 300 km 1 day last week. The factory heated grips are awesome and make for a much more enjoyable ride. With 53 yrs of 2 wheeled freedom and about 1.25 million km under my belt I feel very fortunate to be able to throw a leg over and enjoy my passion.
 

sandro1973

Member
Joined
Jan 26, 2018
Messages
59
Location
Portugal
For all it's worth, i've been doing the 2x cycle on the ignition before cold starts to increase fuel pressure on the pump ( today 13ºC or 55 Fº ), bike was parked in the garage for 5 days.....so far, no issues. I'm running a SkyRich Lithium battery.

 
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