MOTOBRICK.COM
TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Martin on February 24, 2016, 03:45:22 PM
-
I have a mate with a Brick collection 5-1/2 in total (My fault). Only two registered, the Black 93 RT is the problem, when it's cold extremely hard to start and keep running, he has to really work he throttle. Once it's warm no problems until the fuel level gets just under half, then it starts cutting out and surging. I suspected bad temp sensor, he has already replaced the AFM. I went over to help him we substituted the temp sensor for a variable resistor which we set at 2.94 the same as a good one. It started right up an ran like a dream. One problem down, left the variable resistor connected. Rather than delve into the tank he decided to substitute it with a tank off his Red RT, which he had used on his Gold 75S, when it had developed a leak. On doing this it would not start at all, only fire occasionally when starter button pressed. I had a look in the tank and discovered the float was rusted and seized, so put the Black tank back on. On trying to start it, same result as the red tank it would only fire occasionally when starter button pressed. He tried to supply power direct to the pump by connecting to the brown and white wire to a 12v battery, not a sound out of it. He is a highly qualified electrician now retired, and I am doing the grunt work due to the fact he has five herniated discs in his back, he is awaiting an operation and is pretty depressed that none of his bikes are rideable. The Gold 75S registered in pieces, has semi major fairing damage due to a drop and awaiting him to repair. He can only supervise for a short time, and I am trying to help. I have a couple of questions, what wires do you use to hot wire the pump at the connector, and will the pump work when there is no fuel in it, or is there a low level cutout. I have downloaded Bertrand Vogels troubleshooting guide. I will keep updating as and when I get access to the bike any suggestions appreciated. I tried to get him to let me pull the plugs, but by this time he had had enough.
Regards Martin :musicboohoo:
-
He tried to supply power direct to the pump by connecting to the brown and white wire to a 12v battery, not a sound out of it. I have a couple of questions, what wires do you use to hot wire the pump at the connector, and will the pump work when there is no fuel in it, or is there a low level cutout.
The green/white and the brown wire is the connection to the pump....it should run, tank empty or not....
but do it only in short bursts if it's dry.....
-
Just finished another go at getting this bike going. It would run sometimes with a tweaking of the variable resistor. At other times no noise from the fuel pump, so I reconnected the plug back to the temp sensor, which we had compared to two other sensors. Tried it and it fired right up, turned it off and tried it a couple of more times no problems. Mate came back and I showed him the result, started every time. Decided to look at the low fuel cut out problem, took of the filler cap surround, fuel pump sitting low in the damper no obvious problems, hoses could do with replacing and he hates the filter in the tank. He's going to move the filter to outside the tank and will replace the hoses then. He played around with moving the float up and down it does now need adjusting. Went to start the bike and no start, couldn't hear the pump. Pulled the connector apart, checked the supply to the pump brown and green white tracer while hitting start button, we had power. Supplied power direct to the pump and it started. Reconnected the plug and it started while it was running mate accidently moved the plug and it faltered. An AH HAAA moment, a bad connection pulled it apart no obvious corrosion or any thing noticeable. We substituted a piece of wire the same size as the pins and on trying them in the female side three are very loose. He his going to tin them during the week to increase their diameter. I still can't understand why it surges on low fuel level, I questioned him further on this and he tells me it starts to surge and cut out when he has only used about 10 litres. I will try again next weekend. I will take it for a ride a minus 10 litres and see what happens.
Regards Martin.
-
Forget tinning. That connection is a well documented source of issues. Replace with something better.
-
I suggested that but he wants to tin it, I'll have to wait and see. He has a spare harness but doesn't want to use it.
Thanks Martin.
-
Well, the female pins are obviously week. Tinning the male half will only last so long till the female portion expands again and looses contact.
He can only build up the male to the limit of the hole in the plastic half holding the female part.
I agree with Elipten, suggest replacement with something better. Otherwise it's just a waste of your time as well as his.
-
I whole heartily agree and I will try and talk into replacing the plug. Just thought I would post a picture of part of his collection, there is a gold K75s under the yellow tarp. Another 1-1/2 K75s in pieces in the shed. 2 x 750 Virago's, 2 x Norton Commandos, 1 x Norton 350, various bits of Honda 350 & 500 4 Cyl. 2 x Ford F150 3 x F100, 1 x Ford Cortina, 1 Ford Fairlane , 1 x Ford Falcon, 2 x Holden Commodores, 2 x Austin Kimberly, 1 x Mazda 1300 , 1 x Ford Transit, 1 x Toyota Coaster, 1 x Leyland Mini, 1 x Hino Bus being converted into a camper, and 1 x Toyota Hilux which is registered. I have probably missed a few. Also took a picture of the variable resistor.
Regards Martin.
-
A non-running Norton is a crime.
-
I do believe they run but not registered.
Regards Martin.
-
Slow going with the RT, mate temporarily pushed in the female part of the connector for the fuel pump, it now works. Played around with the temp sensor's, I can get my hand in to disconnect it, on doing so the rubber boot was full of water. He has two spare sensors and by using this with a connector cut of an old harness we have determined that there is nothing wrong with the sensor. The problem is with the connector which he will clean this week, there is no wire clip on this and it does not seem tight when it is connected, will try to tighten it somehow. He got side tracked and wanted to look at the Blue 4V K100, so I will start another post on it. :dunno
Regards Martin
-
Heartening to see the menagerie. It's like a mechanical labyrinth.
Good on you for helping out - need to continue to encourage the goodwill.
Is this dude married? My wife had a go at me for the driveway looking like a hoarders house - and there was bugger all there.
-
Definitely not married, but I have had my wife around there just to prove how neat and tidy my garage really is. :hehehe Shown in the pictures is a very small portion of his collection. I am a firm believer in what goes around comes around. He is a great help when I need parts to try out, or I am waiting for bits to arrive and I can borrow parts.
Regards Martin.