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Syncing issues, need advice.
- The Garbone
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Got to break out my toy.. $10 of stuff from Ace, I went all out and put a real valve on it.
Used some of that 15w fork oil I have sitting about, nasty stuff that...
Hooked up my home made sync device to #2 and #1. It worked just as planned..
Moved onto #3 and used #2 as a reference.. Started to have issues. #2 seems to be pulling much harder than 3 to the point I can throttle #3 up and hear the engines rpms increase and still #2 has more pull.
I am wondering if this means #3 has float bowl level issues? Or would the problem be with the actual cylinder and should I try and do a compression check? At the moment I a leaning toward float/carb adjustment since #3 was the carb that was in the #4 spot and running dry for a bit.
Any suggestions?
2007 Royal Enfield Iron
1979 KZ650 & Hack
1949 Ford 8n
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- Patton
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It is not feasible imo to attempt somehow using one carb as a "baseline" carb and pair-syncing the other carbs to it, because the "baseline" carb changes whenever any sync adjustment is made on another carb.
Good Luck!
1973 Z1
KZ900 LTD
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- The Garbone
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kzrider.com/index.php?option=com_kunena&...96302&catid=3#296302
Hmm, a 4 way manifold... could be done but would cost about $20 more...
2007 Royal Enfield Iron
1979 KZ650 & Hack
1949 Ford 8n
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- baldy110
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- The Garbone
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The bike is running rough but not all that bad. I thought it might just be a sync issue. I guess I could check for a hole in the manifold, but I did the WD40 thing a few days ago and that did not seem to affect the idle, guess I will try that again.
Now that I think of it when I pulled the vac caps of #1 and #2 with the bike running it sputtered as those cylinders went lean, but when I pulled the cap off of #3 the engine raced as if it was starved for air in that cylinder.. Hmmm...I wonder... maybe something wrong with the enrich circuit...
2007 Royal Enfield Iron
1979 KZ650 & Hack
1949 Ford 8n
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- Patton
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In other words, carb sync and pilot screw adjustments are the final and very last steps in a complete engine tune-up. Proceeding otherwise is imo a basically futile exercise.
Even perfect carbs can't compensate for deficiences in the other components.
Good Luck!
1973 Z1
KZ900 LTD
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- dangedcoyote
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And if not already done, carb sync should be undertaken only after valve clearances assured to specs, brand new sparkplugs with good healthy visibly observed fat blue spark, and ignition timing assured spot-on (especially if using points, gapped and cleaned before setting timing), floatbowl fuel level assured correct, and an assured ample clean fuel suppy reaching carbs.
In other words, carb sync and pilot screw adjustments are the final and very last steps in a complete engine tune-up. Proceeding otherwise is imo a basically futile exercise.
Even perfect carbs can't compensate for deficiences in the other components.
Good Luck!
I agree
I suggest a bench sync first but that means take 'em off and you might not want to but you can get very close.
1982 kawasaki KZ 440 LTD BELT D4
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- bill_wilcox100
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1) Valve clearance check/adjust
2) Compression test
3) Ignition (spark & Timing) check adjust
4) Float Service Level Check/Adjust
5) Idle Air/Fuel ratio adjust
6) Carb Synchronization
And yes a Shop Manual is a must.
Best of success.
Bill
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
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- nads.com
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- The Garbone
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Pulled the carbs and adjusted #3 float and did a manually sync as well as reset the air screws.
Used the gadget to sync it and all went well, #2 was a problem, so I did that one last. Now she idles and revs nice, none of that stalling clunks.. Will get it on the road in the AM and I am hoping I am done with my tuning chores.
Also checked the ignition, and as per the prev owners description it is a fairly new solid state unit. Sweet..
2007 Royal Enfield Iron
1979 KZ650 & Hack
1949 Ford 8n
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