laxman
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Posts
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Carb bypass/idle mixture circuit
laxman replied to laxman's topic in Venture and Venture Royale Tech Talk ('83 - '93)
Thanks for the tip Jeremy. Bike is back to normal. Wish we had Sea-foam over here. Took 2 cans of 3M carb cleaner to clear that junk out. -
Hi, My bike been running perfect for a long time until #4 cyl suddenly became a bit rough. A check of the exhaust temps confirmed the weak cylinder (not hot compared to other cyls). Problem seems to be from the idle mixture circuit, which was not responding to any adjustment. Avoiding to pull down the carbs, I sprayed carb cleaner on both the pilot jet and idle mixture orifice hoping to get lucky. It improved and the cylinder started firing again. Just to be sure, I used colortune and confirmed the correct mixture was there. Unfortunately that was good for about 15 miles only and the problem came back . Note that the basics checked out : compression, ignition, fuel, vac leaks. Would appreciate any input on this. Thanks.
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TCI - testing info
laxman replied to DonB's topic in Venture and Venture Royale Tech Talk ('83 - '93)
Thanks for the tip DonB. I rechecked the harness again. Followed your tip and likewise the owners manual instruction. A definite 220 ohm. Perhaps a short in the wirings? I"ll have to trace the wires from the terminal all the way to the pickup coils to confirm this. -
TCI - testing info
laxman replied to DonB's topic in Venture and Venture Royale Tech Talk ('83 - '93)
Great info DonB. I've got intermittent spark on #3 cyl. Checked out all the basic stuff in the ignition system. Everything seems to be within specs except the pickup coil terminals. I get 110 ohms on 1 and 230 ohms on the 3 others. I'm wondering if this is the problem. The TCI of course is my last resort. -
Thanks Mbrood. Interesting the transistors and most of the internal parts are the same as a Yamaha Vision TCI. http://www.jetav8r.com/Vision/TCIRebuild/TCI_Rebuild.html
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Currently working on the TCI, wondering what the transistor specs are since the markings are gone. Appreciate any help.
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Talking about a twist on the causes of my engine noise. Found 2 concerns I never expected : 1) #3 spark plug was loose 2) #3 cyl ignition pulses were inconsistent, in short it misfired. The combination of the above contributed / amplified the noise which probably is the clutch basket. Anyway, any problem not involving a engine teardown is good enough for me. Even if it means a new TCI on problem #2.
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Thanks for the feedback guys. The knock is not too audible. You have to listen carefully to distinguish it. What threw me off was the noise totally goes away when you short out the cylinder. Also a sort of "pounding" - like fine vibration can be felt on the right peg. I use Castrol active 10-40 oil, will try 20-50 and see if it helps as a last ditch effort. If the engine has a real problem, I'm sure it will manifest itself in time and the noise will be more pronounced. I'd hate to tear this engine apart now only to discover normal wear.
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Got about 60k miles on the bike, a vague knock started developing. Wishful thinking it could be exhaust gaskets, sucked a little atf & confirmed the leak. After replacing the gaskets on the # 1 & 3 cyl, engine became quieter but the dreaded knock remained. The knock initially seemed to be coming from either the #3 cyl or clutch basket area. Also noticed the idle became a little rough and a fine vibration can be felt on the right footpeg. Checked carb synch and they were. Pulling the clutch in didnt change the noise. Ultimately I shorted out the cylinders and confirmed the knock came from the #3 cylinder. Rod knock. I'm wondering if it is possible to replace the bearing without the pulling the engine out of the bike? How much incidental parts are involved asidede from the gaskets and bearings? Or are we talking about a complete A-Z rebuild Any input would be appreciated.