trip report, long, paiute atv trail - nklr

[BCDIRECT@enetis.net]

Took the advise of the responses and tore into my A-7 today. Took the carb off and disassembled it. Did not find anything that looked real bad but I guess gas varnish can hide. Cleaned it out with two 16 oz cans of gumout. Put it all back together and reinstalled it. ( I also drilled out the pilot screw while I was at it)( it was set to 1 1/2 out) (does that sound right?) I did notice while reassembling the choke/enericher cable that the plastic nut that screws into the card was cracked part way. I got out my trusty super glue and did the best patch job I could. DOes anyone know if I can order one of these? And where? Also does anyone have any good suggestions as to how to tighten/loosen this darn thing? Could they find a worse place to put it? So it's all back together and I crank it up. Runs for a few seconds and dies and gas spills out the overflow tube. From past experiences with dirt bikes that tells be the float or needle valve may be stuck. Tried tapping on the bowl but no luck. Took it all apart again and concentrated on the float area. Back together and fires up! Whew! Took it for a test run. The fast idle and sputtering/dieing is gone. I'm back to where I was Saturday before it died (which is good, I can ride) but I still have the backfiring on deceleration. Especially on downhills. It's quite annoying! Again there does not appear to be any exhaust leaks at the cylinder head. Any more thoughts on how to stop the backfiring? Yea I also disconnected the side stand "safety" switch and neutral safety start wiring. Getting to know my new A7 very well. Barry A-7 (did I mention I'm 18 miles from Sturgis)2 weeks till the rally! Concerts during the rally: Styx Kansas Blue Oster Cult Cheap Trick and many more!

[Gary Ott]

Attachments :The carb has a Coasting Enricher System that is supposed to prevent backfiring on deceleration. Perhaps you should be looking in this area. I know nothing about this system, and the manual only has an exploded view of it, no information that I can find. I'll send the page as an attachment. Maybe it will help you, maybe not. Won't hurt. Hope it helps. Gary Ott 69 XLH 73 T140 74 FXE 82 GS1100EZ A6 Gary Ott 69 XLH 73 T140 74 FXE 82 GS1100EZ A6 _______________________________________________________________________ $1 million in prizes! 20 daily instant winners. AltaVista Rewards: Click here to win! http://shopping.altavista.com/e.sdc?e=3 _______________________________________________________________________

[bmgecko]

Mr. Fred...

 

What with all the talk of the high level of commitment you have to the KLR and the dual-SPORT, as well as being somewhat of a magician with getting what people need shortly after they need it, I can only say that if I find myself in need of something, I will be calling you.  I guess you are quite literally a wizard of sorts!

 

Chris "Ya'll folks notice how many "wizards" there are on this list?" Astier

[Jim Hyman]

Barry, Glad to hear that you made major progress with the carb problems. If you haven't already read & downloaded Ron's excellent tutorial on the carb, go to: http://www.geocities.com/~klrdsn/cvcarb/index.html Page 3 deals with the coasting enrichener. The coasting enrichener is spring loaded & may be stuck in the normal position, contributing to your backfiring. Removal of this unit is from the outside (left) of the carb body. Be careful with the carb cleaner, some cleaners are fatal to rubber and/or plastic parts. You might want to experiment with a richer pilot screw setting. When the throttle is closed (& the carb slide lowered) the slow speed (pilot) circuit is feeding some fuel. A somewhat richer pilot setting may reduce the backfiring. Try several different settings (at 2, 2 - 1/2, & 3 turns out) and see if it helps. For on-the-bike adjustments, I made my own pilot screw adjusting tool out of a 6 mm bolt, about 3/4" long. My bench grinder make quick work of 'machining' a flat screw driver bit that fit the pilot screw. I also installed a nut, bottomed out against the bolt head & colored every other face on the nut. This allows me to more easily count (in 1/6th turns) how far in or out I've gone. Don't overlook checking the float level setting. It must be spot on. I prefer to measure & set the float level with the carb positioned so that the float assembly hangs down, like a swing set. This way the float's weight can't depress the spring loaded float valve needle rod (say that real quick 10 times). Be sure to measure both floats for proper level, sometimes they are not set at the same height. The cracked plastic nut that secures the starting enrichener cable should be sealed with silicone seal until your replacement arrives from Fred. The crack may be allowing excess air in the carb. Several carb specs that may relate to your backfiring. main jet #: 148 (for A3->) pilot jet #: 40 pilot screw: 1 - 7/8 turns out (A3 ->) float height: 17.5 mm (as measured from the float bottom to the float bowl mating surface at the bottom of the carb body. Professor A9 Federal Way, WA. [USA] ------------------------------------- Barry wrote: Took the advise of the responses and tore into my A-7 today. Took the carb off and disassembled it. Did not find anything that looked real bad but I guess gas varnish can hide. Cleaned it out with two 16 oz cans of gumout. Put it all back together and reinstalled it. ( I also drilled out the pilot screw while I was at it)( it was set to 1 1/2 out) (does that sound right?) I did notice while reassembling the choke/enericher cable that the plastic nut that screws into the card was cracked part way. I got out my trusty super glue and did the best patch job I could. [snip] So it's all back together and I crank it up. Runs for a few seconds and dies and gas spills out the overflow tube. From past experiences with dirt bikes that tells be the float or needle valve may be stuck. Tried tapping on the bowl but no luck. [snip] I'm back to where I was Saturday before it died (which is good, I can ride) but I still have the backfiring on deceleration. Especially on downhills. It's quite annoying! Again there does not appear to be any exhaust leaks at the cylinder head. Any more thoughts on how to stop the backfiring? [snip]

[mrob1515@aol.com]

Richard, nice trip report. Well written. Mike Roberts Vancouver, USA