Steve Saunders Goldwing Forums banner
Status
Not open for further replies.
1 - 8 of 8 Posts

·
Premium Member
Joined
·
11 Posts
Discussion Starter · #1 ·
imported post

Hi all



I have a GL1200 LTD 85 (thats a fuel injection engine) and when cold, the idle is too low and it have a lack of power at low RPM.



Is there anyone who as an idee of the problem?



Thank you
 

·
Administrator
Joined
·
27,777 Posts
imported post

Fuel pressure too low maybe, have you changed the filter lately?
 

·
Premium Member
Joined
·
11 Posts
Discussion Starter · #4 ·
imported post

The fuel filter has been change a mount ago and the idle when cold is betwen 720 to 800 and usualy when hot it is at 920-940 rpm.
 

·
Premium Member
Joined
·
11 Posts
Discussion Starter · #5 ·
imported post

I consider low driving RPM below 2000rpm. the bike will miss and shake below 2000rpm. All this only when the motor temperature is under the middle of the gage.

Also, when i start it cold, i have to hold the handle a few second unless it stall.
 

·
Administrator
1987 GL1200 Interstate
Joined
·
23,273 Posts
imported post

I hate to tell you this but your bike is fine.

You are trying to drive it like a car.

Idle needs to be raised to read 1100 rpm when warm.

It should never be driven below2800 rpm (cruising).

And never try to accelerate below 3500 rpm for moderate acceleration, (just speeding up) or 4500 rpm if you are passing a truck or line of cars.

If you keep using it wrong you will ruin the bike in short order.
 

·
Senior Guru
Joined
·
4,298 Posts
imported post

The idle control (IAC) seems to have a problem. That bike should always idle good, even at 30 degrees. Maybe it's stuck inside, or someone may have plugged the air hose somewhere. It's a little rotary valve that opens when cool or cold. Then, upon starting it gets 12v to start a heater warming up internally, and also, uses water circulation to also aid in a faster heating of the bi-metallic coil inside. That levers said rotary valve, causing it to start closing the air passage off. They do stick, and/or get gummy inside.

Upon starting, the idle typically will go to about 12-2500 rpm, and slowly head towards the idle screw setting as the engine warms up. Works very well, when working right. Better than the 1800, in my opinion.
Get a manual. Then, find the LTD/SEi supplemental. The air valve is inside that part of the manual.


Dennis is right. That 1200 needs revs. They're gut-less at real slow engine speeds. It likes revs. Not like the 1500 or 1800. Those are more like old Deere engines, stump pulling power at low rpm.

I always ran my LTD at 1050 idle, and that kept the alternator charging just fine, also. (Nippondenso) I always started the bike in gear, to prevent ugly noises when shifting into gear with the bike cool or cold. I rarely let it warm up. Just take off like a sane man, and take it easy till a bar or 2 on temp gauge.

This reply is assuming that the tune is ok. There could be other issues, which would compound the problem. Like, throttle body balance, ignition condition, fuel pressure, vacuum hose problems, etc.

How's the power at speed??


I have a couple good iac's, if anyone needs one.
 

·
Premium Member
Joined
·
11 Posts
Discussion Starter · #8 ·
imported post

Thanks all for the Info.

Power at speed is OK but since a while i foud the bike a bit hard on gaz then before.

I will check what Oreronwinger said and i will reverd the motor more.
 
1 - 8 of 8 Posts
Status
Not open for further replies.
Top