Originally Posted by Boondocker
Im about to pull the trigger on the Yamaha ef 2400is with propane conversion from US Carburator. Anyone have this unit? Does anyone know what the change is from the EU to the EI serries? And who has done business with this company? Here is the link: EF2400is
I would steer clear of them! Here is my complaint letter to them
Six Year Saga Finally Resolved
My father, brother and I purchased a tri-fuel Yamaha generator from you in October of 2008 for our partial year cabin use. Upon initial receipt we had a very difficult time getting the device started on propane fuel. During the week of install we spent no less than 25 hours installing and messing with the load lock to get the device to start effectively and run at peak. In the end we settled for running at peak and lived with the hard starting due to lack of fuel and waiting for it to go through the regulator. We also bought a service policy as my father was concerned about the tri fuel set up and how it would work.
My father has been doing most of the communication with you regarding the fact that this thing wasn’t working right from the beginning of ownership. During the 1st year of the service policy he asked to get a spare starter as he felt this could be a point of failure (This was refused). He had numerous calls to your tech support and engineering to try to drive to a fix. To no avail! During my father’s visits to the cabin I would spend several hours a week with him trying to trouble shoot it from a phone call. A year and a half in you guys sent him a replacement regulator with a needle seat priming mechanism on the front and stated that this was designed and developed to fix the hard starting conditions (Experienced 10-15 seconds of cranking the starter in order to get it going). Your paperwork stated that this new regulator set up was put on a machine in your shop and tested and performed perfectly (There is no way for this had been tested on a cold start as you will see by our findings). My father replaced the original regulator with the new regulator and nothing changed. On a cold start it still exhibited 10-15 second of starter cranking to get propane in to the carb. So for the entire six years of ownership we have spent countless hours to try to get this thing running right. Completely ridiculous to get vacation or time off and get to go to the cabin only to experience the headache of having to constantly mess with this generator to get it started. During this time we have ruined two batteries as a result of the excessive cranking in order to start.
This past October 2014 my father was at the cabin with my two sons and experienced the straw that broke the camel’s back. The starter broke! So now after spending $250 dollars in batteries we are forced to buy a starter for $498. So this starter went out in its sixth year with less than 360 hours on the machine. This too is ridiculous and is a direct result of your faulty design! When we ordered the starter from the Yamaha store the tech advised that he has NEVER replaced a starter on this model of generator EF6600.
My father, brother and I had one more trip planned in November. We had no choice but to order the starter and incur this expense. We installed the starter and it performed as designed, but still required excessive cranking.
I arrived at the cabin right after the new starter was installed and now while on site I am trying to understand why your redesigned regulator/primer is not working. I have spent 30 years in manufacturing and as I was investigating your fix it was obvious to me that the front mounted needle and seat could not be providing early fuel for the cold start. Now mind you that my father had called several times talking to your techs and engineers and they ensured him if the needle and seat was turned out 2.5 turns it would work fine (Even though the documentation states 1 turn). Upon my inspection it was apparent there was no early fuel flow happening and tech comments were not true, there was NO change on cold/hot starting with any change on the needle seat adjustment. If you look at the attached picture you will find that the inlet nipple is drilled and tapped into a location on the brass T that when the load lock is set correctly the nipple is blocked by the load/lock bolt inside the T.
I would say the root cause of this happened when the T was drilled/tapped for the nipple it was loaded into the drill press fixture backwards so it was drilled on the load lock/bolt side. I believe you would want the nipple inlet away from the load/lock bolt side for free flow gas (RED Arrow) from the primer system. If oriented 180 degrees opposite in the fixture the nipple would be where the red arrow is. See picture below
After disassembly it was evident that the flow into the nipple/T (BLUE Arrow) through the small hose above was blocked by the load/lock bolt and no gas could enter no matter how many turns on the needle seat. I tried to reverse the T but the threads were different from the 3/8” pipe thread on the left vs. the machine threaded bolt.
In order to permanently fix the unit we will need a T where the nipple is drilled/tapped closer to the pipe thread side so there is no chance of the Load/Lock bolt to block the opening when set properly (RED Arrow).
In order to test our theory we utilized the original T (with no nipple tapped into the top) and had to purchase some extra fittings (YELLOW Arrow) and flow gas through two T’s in order to get unobstructed flow through the primer solenoid and small gas tube.
After completion of our field fix we set the needle seat to 1 turn (As documentation stated) and upon cold start if fired up in 1-2 seconds of cranking the starter. Subsequently we have fine-tuned the load/lock and the generator runs perfectly under load and the primer needle seat is about ˝ turn and generator fires up within 2 seconds.
It amazes me how one wrong machined T on your part completely eliminated your fix from working. I can’t tell you how much frustration, wasted time and effort we experienced over 6 years of ownership, while constantly working on the generator after spending an initial $2812 on Invoice #9649 dated 10/7/2008 with you for product that DID NOT perform. Plus $498 for a replacement starter (that has no history of ever being replaced in the field) and $250 in 2 batteries worn out.
I have to say I am expecting you to send me a new load/lock T where the nipple is drilled/tapped on the proper side and some form of financial help for the extra $750 dollars we had to spend due to the faulty initial design and interim fix that DID NOT work.
In the end after fixing the product with the field fix last week I am happy that our field design worked and now the product works as it should have 6 years ago.
Please advise, on how you will remedy our issues.
Sorry pics wouldn't copy over
After 2 months of following this up they refuse to remedy our losses and issue