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  1. 9

    C40TLRX link and sync procedure need clarification

    I just happened to re-look at the procedure in my manual and was confused at the sequence that it stated. After adjusting the throttle timing linkage I thought that you needed to have all the butterflies completely closed and synced them at that point, but the procedure says 1. loosen the...
  2. 9

    Rodbolt,could you give an experts knowlage on prime Start System question?

    Rodbolt, Is the Prime Start System designed to draw just fumes out of the middle carb when in the normal position? Not liquid fuel? My C40TLRX will pump liquid when in open position, but in normal position I get nothing but fumes when I pull a vacuum on the line from the Prime Start cold and...
  3. 9

    Question on Yamaha Prime Start System

    For anyone that has a 3 cylinder Yamaha with the Prime Start System I have got a question or 2 for you. Mine is a C40TLRX but I am sure any others would be the same. Pull the line off the prime start system where it attaches to the intake behind the top carb and see if you can get any fuel out...
  4. 9

    C40TLRX CDI output voltage, Rodbolt how high is too high

    I have finally been able to get my hands on a peak reading voltmeter and measure the CDI output like the manual says to and the readings I get are 205v instead of the 140v at 1,500 RPM's on all three outputs. The manual says to replace the ignition coil if the the reading is beyond...
  5. 9

    C40TLRX tach output signal

    I would like to find out what kind of a signal the tach receives from this Yamaha C40TLRX motor and how it is translated to RPM. I do not have a tach but have a Fluke 87, and would like to read the RPMs for testing and trouble shooting. From what I have found out so far is it is a AC voltage...
  6. 9

    Rodbolt, motor still cutting out at WOT

    This is really getting strange. Yamaha 1999 C40TLRX still has the high speed cutout or miss, like it is dropping a cylinder at high RPMs . but when I take the cowling and silencer off of the front of the carbs it runs fine WOT, no miss or cut out. Reinstall the silencer and it cuts out a lot at...
  7. 9

    Yamaha RPM limiter question for Rodbolt

    Rodbolt or anyone else that may know the answer, How does the CDI unit on carbed Yamahas limit the RPM? ( mine is a C40TLRX) Does it start dropping a certain cylinder's spark or randomly drop spark to all cylinders. Or is there a different way that it does this? Would it feel like a high...
  8. 9

    Yamaha C40TLRX carburetor kit missing o-rings

    Has anyone else found out that the Yamaha carburetor kits do not contain the o-rings that go on the inlet seats? It seems strange that they are not included with the new needle,seats, floats and other o-rings and gaskets . The local Yamaha dealer told me you just have to pull them off the old...
  9. 9

    What should a C40TLRX fuel pump pressure be?

    I was going to buy a Vac/ Pressure gauge to test the fuel system today but did not know what the pressure is suppose to be. I found something that said the Vac should be 0-5 "Hg I tried to find it in the manual and did a search in the forum but did not see any pressures listed. Will a gauge that...
  10. 9

    Has anyone used the Mallory carberator kit MAL9-37503

    I just found a site that sells the Mallory kits and was wondering if they are just as good as others?
  11. 9

    ESI325 Cordless Inductive Tachometer

    Has anyone used one of these tachs on 2 stroke outboard motors for troubleshooting? It looks like a good deal for just $40 plus shipping. Says it can be used on any spark plug motor.
  12. 9

    Rodbolt, I could use your advice on a C40TLRX timing problem

    I have had a post out there for a few days C40TLRX yamaha timing problem but have not had any luck getting any help, could you look at it and give me a reply. 2/12/2010 Just to let others know what I did to fix my problems that you will read about in this thread, I am editing this on the first...
  13. 9

    C40TLRX yamaha timing problem

    I set the throttle link like the manual said to and the pointer is pointing at 7 degrees ATDC in neutral low idle and 25 BTDC opened up but the actual timing is over 10 degrees ATDC at idle( maybe as much as 14 ATDC, no marks past 10) when checked with a timing light. Does this make any since...
  14. 9

    C40TLRX stumbling or cutting out

    I have had this 1999 C40TLRX start giving me some problems the last 2 times I took it out on the water. It started and idled fine but when I got up on plane it sounded like it was dropping a cylinder and losing some RPMs and them coming back up to normal. The bulb stayed hard and it did not help...
  15. 9

    Oil from speedometer holes on Yamaha lower unit

    How does oil/gas residue seem to be getting into the pickup for the speedometer on the lower unit of my 1999 Yamaha 40HP model #C40TLRX. It does not always seem to be there but I have noticed it several times oozing out of the holes on both sides and running down the skeg of the lower unit...
  16. 9

    yamaha 3 cyl prime start enrichment system

    Can someone explain how or if the Yamaha prime start/ enrichment system sends fuel to all tree cylinders when the system looks like it is only attached to the center carburetor? Does this system only send extra fuel to the middle cylinder allowing the top and bottom cylinders to run lean during...
  17. 9

    Water flow from exaust ports on 99 40hp yam

    I am looking to buy a used 1999 Yamaha 40 model #C40TLRX. While test running I did not see any water flowing out of the exhaust ports on the back of the motor like my Johnson always had. When I ask a mechanic at the local shop he said it should have water flow out of the ports after the...
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