Wanted cdi igniter 1200 ltd


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roar
Posts: 38
Joined: Wed May 23, 2018 11:57 pm
Location: Norway kristiansand
Motorcycle: 1200ltd

Wanted cdi igniter 1200 ltd

Post by roar » Fri Jun 29, 2018 1:17 am



4 wire cdi ignitor oki mps 200
roar aarud
Norway



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Rednaxs60
Posts: 1863
Joined: Wed Nov 18, 2015 12:44 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1985 GL1200 LTD
1995 GL1500 SE CDN Edition
2008 GL1800 (sold)
Ontario 1985 GL1200 LTD (sold)

Re: Wanted cdi igniter 1200 ltd

Post by Rednaxs60 » Fri Jun 29, 2018 11:51 am

Roar - have gone back and read some of your other threads.

The spark igniters are fairly robust so failure is not probable. Have found replacement spark igniters out of the US that are for the 1000/1100 GWs and are a five wire unit. Read on the CX 500-650 Turbo forum that these have been used successfully on the FI turbo bikes. You have to use only four of the five wires. I have reviewed the circuit diagrams and think it is the "blue" wire that is not used. Can't confirm. Asked the question on that forum but never received an answer. Also sent a query to the company and they would not commit either - understandable. The spark igniters are from Procom, here is the eBay site: https://www.ebay.ca/itm/162015515482?rmvSB=true

You have a misfire. At what RPM does this occur - is it in the lower RPMs or in the higher above 3000 RPM? Is it a hard misfire in that the engine is actually "jarred" in that the engine wants to stop? There are a lot of sensors involved in the ignition timing on this engine.

The Ns sensor (crankshaft sensor) in by the timing belts are for engine timing, the Gr/Gl sensors on the back of the right cylinder head are for injector timing, the TPS is for timing as well as are the PB sensors (manifold intake vacuum). The ECU takes all these inputs and advances/retards the ignition timing to make the engine operate correctly.

The engine ignition timing up to 3000 RPM (approximately) used the TPS signal, RPM and PB sensor information to adjust the timing in concert with the Ns and Gr/Gl sensors. Above 3000 RPM it is the TPS and engine RPM, the PB sensors are maxed out and no longer used.

A TPS that is failing, but not failed will still allow the engine to be started and operated, and there will be no error code - been there. If the TPS is failing there are tutorials on the forums that give instructions regarding an alternative replacement part.

If you have a faulty PB sensor, the engine will operate with only one PB sensor, the same with the Gr/Gl sensors. The PB sensors do not fail very often either.

The Ns sensor can be replaced with a 1500 Ns sensor but you have to modify the engine mounting bosses to fit the 1500 sensor. A better solution is to fit a set of PG sensors from an '85 Aspencade - can be an '85, ''86, or '87 - these fit in the same place as the Ns sensor but since there are two sensors, there will be one above and below the trigger wheel. You only need one to operate the '85 LTD engine, pick one and use the wires from it. The other sensor will be a spare.

There are no new PB sensors available. Some have found replacements that are fitted to the early FI Honda cars. I have replaced mine with a pair that are found on a Suzuki. The Suzuki sensor is: Brand: Denso. Type number: 100798-5630. Suzuki ordering number: 15620-35F00. Suzuki description: Sensor Boost, IAP (Inlet Air Pressure) sensor. Have to modify the mounting arrangement to fit.

Hope this clarifies your issue a bit.

Good luck.
"When you write the story of your life, don't let anyone else hold the pen"

Ernest

roar
Posts: 38
Joined: Wed May 23, 2018 11:57 pm
Location: Norway kristiansand
Motorcycle: 1200ltd

Re: Wanted cdi igniter 1200 ltd

Post by roar » Fri Jun 29, 2018 12:25 pm

trs is ok
Engine runs great in acceleration
Stedy low rpm 2000/2500 rpm does not go well

User avatar
Rednaxs60
Posts: 1863
Joined: Wed Nov 18, 2015 12:44 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1985 GL1200 LTD
1995 GL1500 SE CDN Edition
2008 GL1800 (sold)
Ontario 1985 GL1200 LTD (sold)

Re: Wanted cdi igniter 1200 ltd

Post by Rednaxs60 » Fri Jun 29, 2018 6:59 pm

Is the miss fire a "hard" miss fire that jars the motor and the engine almost seems to stop. The issues I had were generally in the lower RPM range as well, and got progressively worse as I rode the bike. My bike also accelerated very well, but this is when the throttle is being used in the near to wide open position, near the upper range of the TPS where there generally is no issue.

The throttle position sensor can spec out IAW OEM specs; however, if there is a breakdown in the rheostat it will probably show up in the lower RPM ranges. Another issue is that the "hard" miss fire got worse as the engine temperature increased.

I initially rejected the TPS as the issue. It was recommended to change the TPS long before I did, but I was focused on the fuel system and would not relent.

Knew the electrics were goods, but questioned the fuel system. Fuel system checked out, so the last issue to address was a possible faulty TPS. Had no error codes, and had just installed it. The TPS checked out to be good, but unless you check with an oscilloscope, you won't be able to see the chatter that affects the ignition system. Changed it out with another new one and the miss fire issue went away. Used some new ones from China. It can be said that these are not good quality, but rheostats for this purpose are probably all made in the same place. As I've heard before, Russian, American, all made in Taiwan.

Here is an article that not only recommends checking the TPS voltage, but the resistance between the leads of the TPS. It also recommends an analogue voltmeter instead of a digital. http://autoditex.com/page/throttle-posi ... -22-1.html

To use a quote from Star Trek and the 1890 version of Sherlock Holmes: "when you have eliminated the impossible, whatever remains, however improbable, must be the truth?” These '85 LTD FI models fall into this category all too often.

The unfortunate part is that you would have to fit an aftermarket TPS unless you can find an OEM original for sale and it will generally be used.

I'm looking for a used oscilloscope so I can check the TPS before it is used. Not a lot available, going to check some pawn/recycle shops.

Good luck. Look forward to a successful resolution.

Cheers


"When you write the story of your life, don't let anyone else hold the pen"

Ernest

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