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Re:Decompression solenoid needed?
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TOPIC: Re:Decompression solenoid needed?
#890779
davej (User)
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Re:Decompression solenoid needed? 2 Years ago  
Keep in mind that if you are trying to push start because of a dead battery due to a non working charging system the thing won't start and run. Without proper voltage to the ignition system the bike will never run. May as well push it home.
 
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Re:Decompression solenoid needed? 2 Years ago  
davej wrote:
Keep in mind that if you are trying to push start because of a dead battery due to a non working charging system the thing won't start and run.

If your charging system is working it will get you home on a bum or drained down battery. (Like if you left the dome light on in your bike...)

I haven't got around to trying it yet and just wondered. My sleds moved me in to the same world of no manual way to start them. Big 4 strokes with no pull start, just like the bikes don't kick start any more.

I have a small set of jumpers that I carry in the sleds now, since I always have two sleds out on a trip. Not sure if I would ever wish I had the jumpers with me on the bike, or if I could just start pushing.
 
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Last Edit: 2015/05/29 09:08 By MidwestMike.
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Re:Decompression solenoid needed? 1 Year, 4 Months ago  
Today (Feb 23,2016) I should get my NEW OEM decompression solenoid and then I will know how far it should stick out when at rest and when energized.

The Clymers' Yamaha workshop manual is very useless on information on this part.
Someone made a back room deal.

Any way I will find out and report back to the forum members.
The solenoid is 10 years old on my 2006 model.

The new decompression solenoid arrived!!!

The solenoid push rod only sticks out about 1/32 of an inch. On the new OEM solenoid.
If you pull lightly on the solenoid it does resist immediately.
The solenoid spoon is right against the solenoid push rod.

Getting the screws loose was a little difficult because they had been installed with red locktite?

I put the new solenoid on and it tried to start on the first attempt with no help.
It was very low on gas and I think I gave it too much throttle it backfired.
I waited a few minutes then it started with the choke off.
It was about 65F today.

So it looks like it it was ridden a little it will be ok.
Brand new battery too with 320 cranking amps.

What I wonder is why the battery gets so low so fast.
I have a new starter too.
I have worked on motorcycles since I was 16 years old.
I am 66 now and this Yamaha Roadstar is very weak on starting.
The only thing I have not done is to change the negative battery cable.
I think I will remove it and test its resistance.

The positive battery cable is brand new 4GA> wire.
The positive battery cable is not any longer than most other motorcycle battery cables.

One more thing.....There are two plastic washers on the solenoid mount and it looks like it would be easy to put slightly thicker washers on and space the solenoid out just a little bit.

When you attempt to start the bike the decompression solenoid is being activated at the same time as the starter. A big drain. So when you pull the spoon /lever thing the battery gets some help.

Brand new decompression solenoid.
 
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Last Edit: 2016/02/24 14:11 By LuckyDon.
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Re:Decompression solenoid needed? 1 Year, 4 Months ago  
If I remember correctly my Honda CB750 SOHC had a battery about the same size as this Yamaha Roaster battery.
 
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Re:Decompression solenoid needed? 1 Year, 4 Months ago  
Why are you messing with the throttle, on a start? Don't touch it.

Pull the enricher
Make sure the fuel is on.
Roll the throttle a couple of times, to prime the carb throat...and then don't touch it.
Push the start button...did I say, "don't touch the throttle"?
The bike should start...don't touch the throttle.
The bike should start, with a high smooth idle, for about 10 secs or so, and then go to a rich rough idle. Then, push the enricher in 1/2 way....don't touch the throttle.


When your ready to ride off, then feather the throttle, and ride appropriately, until the bike warms up, and idles well w/o the enricher.
 
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Shores (User)
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Re:Decompression solenoid needed? 1 Year, 4 Months ago  
I need to check mine.
 
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Re:Decompression solenoid needed? 1 Year, 4 Months ago  
LuckyDon wrote:


One more thing.....There are two plastic washers on the solenoid mount and it looks like it would be easy to put slightly thicker washers on and space the solenoid out just a little bit.



Brand new decompression solenoid.


No harm in taking out any slack in the decompression linkage, but I'd be careful with taking too much out.

The pin (#2) that does the magic and opens the valves and dumps compression resides just below the exhaust tappet(s) and it wouldn't take much constant pressure against the rod (#1) to allow that pin to constantly make contact with the lifter face and do damage down the road..


Just sayin'.


 
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Re:Decompression solenoid needed? 1 Year, 4 Months ago  
Biker Ron,that is exactly how I usually start my Roadstar.

Now with a new battery and new decompression solenoid it all seems to work now.
The new decompression solenoid travels its full length outwards.
The solenoid was 10 years old.
 
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Last Edit: 2016/02/25 13:25 By LuckyDon.
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Jaybo (User)
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Re:Decompression solenoid needed? 1 Week, 1 Day ago  
OK, so I have a leak in the camshaft cover (I believe) so I took the decomp cover off so I could get a better look. It does look like it is leaking at the gasket but not 100% positive. I need to take the cover off (but need a gasket first) and make sure it isn't leaking around the decomp shaft. I don't see any part for that shaft seal though in the manual?

Anyway, I don't see my solenoid doing any sort of movement when I start it. It fires up just fine but that shaft did not move. I can move it by hand however. From reading the decomp threads it seems that it won't start without it working, so I'm mystified here. Can anyone shed some more light on this?
 
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#1014718
MikeyC (User)
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Re:Decompression solenoid needed? 6 Days, 21 Hours ago  
I'm betting it's moving and you just can't see it move, it ain't much.
 
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