Fred wrote:Herb wrote:The whump is pretty much normal, for the 1400. When you shut it down the last few revolutions spit some gas into the exhaust, and with the really hot exhaust, from steady high speed running, it ignites in the mufflers.
whats your idle speed 2000 RPM last few revolutions !!!!.
Spits gas into the exhaust??? you got carbs or buckets. Where do you get this shit from.
Fuel will not ignite without a hot spark try it-- No part of the engine is hot enough to ignite fuel in the exhaust or other wise. Ignition of fuel in the exhaust can only be ignited by ignition from the next ignition but you have just turned that off.
Thats why you pricks go off and buy irridiums for a hotter spark. Go ahead and throw petrol on a hot exhaust --- nothing.
Go down hill and turn off the ign any back firing ? no ??--- now turn on the ign Fucking BOOOM.
Do you just like make this shit up when you smell coffee or fish. FFS
This explanation of the issue is for the others reading this thread. Since freddie already knows everything, about everything, I know that nothing I say will ever make a difference in his attitude, or lack of knowledge.
I have been riding 1400 intruders since 1989, over 350,000 miles on 2 bikes, and I have had this same issue with both of them. When I bought my 87 new (in 89. It was a leftover 87 model with 9 miles on it from rolling it around the shop), I had it happen a few times. When I took it in for the 500 mile service I ask about it.
According to the dealer it has to do with the transient enrichment system, which is meant to enrich the system when the throttle is quickly shut down at high rpms. Shutting off the engine creates the same vacuum as shutting down the throttle and allows extra fuel into the engine. Remember that it only happens after a quite a long ride, and, I'll bet, very little of it at slow speed. When this extra fuel hits the hot exhaust, it will sometimes ignite, causing a muffled backfire in the muffler. If the system is set a little rich on the idle circuit, or the air filters are getting dirty, it will do it more often.
If you want a little more understanding, download the manual for the 1400, that is pinned at the top of the 1400 forum, and look up the transient system on the 1400 carbs.
Oh, yeah, to cover another of freddies ignorant comments, after the ignition is turned off, the engine turns over a number of times, when the rpms are adjusted to 1000 rpm, which is the recommended idle speed for the 1400.
Oh, yeah, a backfire does NOT turn the engine backwards.
freddie, you go ahead and throw gas on a really hot exhaust, I'm not that stupid. There have been a lot of engine fires from fuel leaks on hot engines. I always knew that your mother raised, at least, one fool.
freddie, of course you would not have had it happen. A long ride for you is to the bar 10 blocks away instead of the one 5 blocks away.
freddie, your ignorance is once again showing. Basic know nothing asshole.
I can't seem to win the lottery. I think I have used up all of my good luck riding motorcycles.