My fellow enthusiasts,
it is with a great deal of grief I present to you an issue with one of our products. A client has reported a failure of his crank pulley, citing that the screws used to fasten his trigger wheel have loosened and subsequently backed out. Thus the trigger wheel was free to flail about and do some damage to surrounding components.
It should be noted that we have made dozens of these crank pulleys, with this being an isolated incident. Even an isolated incident though, is unacceptable and thus we are replacing the damaged components free of charge.
The client purchased the part in 2009. I believe, however, we have already remedied this problem. In early 2010, I spent a good deal of time researching and testing fasteners. This research was immediately put to use to improve our products. Since then we have used Loctite 246 when affixing trigger wheels, taking care of any loosening due to vibration. We are also very careful about torquing the fasteners during assembly. For further reassurance, fasteners are marked after they are torqued, that way we know we don’t miss one during assembly.
I take any issue with our products very seriously. They have my name on them and they darn well better be perfect. That being said, mistakes happen and we do what we can to make things perfect again. I want to report this problem and hope that you will help notify anyone who has one of our crank pulleys with trigger wheels. I urge you to check the fasteners, and implement the procedures I have outlined above.
For the full write-up, see: Trigger wheel failure
Trigger wheel failure
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redek
Re: Trigger wheel failure
First off let me say that I am very pleased with the single carb spacer I purchased a while back, it was an obvious indication of your high quality and competitively priced products. You should be commended for being up front about the issue, and I have no qualms about purchasing your products in the future.
I have used loctite on a near daily basis for the past 4 years, and did some loctite tests after we had some failures. The product uses stainless and aluminum parts, which do not react with the loctite to cure, and also have possible oil contamination. A complete cure is necessary to achieve full resistance to loosening. We tried 7471 and 7649 primers to activate the 242 and 271, but still had less than reliable results. Luckily loctite came out with blue 243 and red 263 which do not require a reactive material. I have had zero failures in the past 8-10 months since switching to 243 and 263.
If the issue has already been corrected, then no further action is necessary. But if it is possible that the loctite is not achieving a full cure, I suggest you try a self curing variety.
I have used loctite on a near daily basis for the past 4 years, and did some loctite tests after we had some failures. The product uses stainless and aluminum parts, which do not react with the loctite to cure, and also have possible oil contamination. A complete cure is necessary to achieve full resistance to loosening. We tried 7471 and 7649 primers to activate the 242 and 271, but still had less than reliable results. Luckily loctite came out with blue 243 and red 263 which do not require a reactive material. I have had zero failures in the past 8-10 months since switching to 243 and 263.
If the issue has already been corrected, then no further action is necessary. But if it is possible that the loctite is not achieving a full cure, I suggest you try a self curing variety.