Hard to start - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

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post #11 of 17 (permalink) Old 02-15-2020, 01:08 PM
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If it has an evap system, it will NEVER start properly. Get rid of the COMPLETE evap system and PAIR system if your bike has one. Put new plugs in it. Take the gas cap apart and remove EVERTHING inside. The gas tank MUST be vented to the atmosphere.

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1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
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post #12 of 17 (permalink) Old 02-15-2020, 04:28 PM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
If it has an evap system, it will NEVER start properly. Get rid of the COMPLETE evap system and PAIR system if your bike has one. Put new plugs in it. Take the gas cap apart and remove EVERTHING inside. The gas tank MUST be vented to the atmosphere.
Not one bike sold could ever start hot? Amazing!

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post #13 of 17 (permalink) Old 02-15-2020, 07:21 PM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
If it has an evap system, it will NEVER start properly. Get rid of the COMPLETE evap system and PAIR system if your bike has one. Put new plugs in it. Take the gas cap apart and remove EVERTHING inside. The gas tank MUST be vented to the atmosphere.
Sounds like a lot of extra work just to save a few seconds on restarts. I’m ok with just opening the throttle a bit.
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post #14 of 17 (permalink) Old 02-15-2020, 07:45 PM
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Evap is only on Calif. models, but I was happy to get rid of the air injection. Combined with the earshave, it cleans up a lot of clutter and allows better airflow over the heads.

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post #15 of 17 (permalink) Old 02-15-2020, 09:04 PM Thread Starter
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So I've gone threw the bike n checked the vacuum line from under tank n it was bent.i fixed that.seems to do a lil better.but I've tested the pick up coils n they are good.but the starter looks burned on about 2-3 coils.thos is the replacement due to installing a radio n I havent been using it.but for $100 from amazon,I thought it would work.new battery.so I believe that's what I need to replace now.was hoping to go to bike week in Daytona next wken.lol
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post #16 of 17 (permalink) Old 02-16-2020, 10:22 AM
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If itís a new AGM battery, and you have problems, do the pick coil mod.

I never used the choke either unless the bike was completely cold. The ďchokeĒ is really just an enrichment circuit that just squirts extra fuel into the intake.

What always worked for me on a hot start (didnít do the pick up mod) was to just crack the throttle open AS I hit the starter. This pretty much could be similar to using some choke. I just found it easier.

Do you have iridium plugs? They do help.

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post #17 of 17 (permalink) Old 02-21-2020, 07:14 AM
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The EVAP system will seriously interfere with starting if you ever fill the tank over 3/4 full. Gas gets sucked into the charcoal canister and causes a rich starting system. When I bought my first new VN750, and had starting problems, the dealer told me not to fill the tank over 3/4 full. Total BS. The next day I removed the EVAP system, filled the tank all the way up, and never had any more problems. The PAIR system is another piece of EPA GARBAGE. It will cause backfiring and exhaust overheating, plus it seriously clutters up the bike. When I finished removing the EVAP and PAIR systems, I literally had a 5 gallon bucket full of EPA GARBAGE. I also had a much better running and much cleaner looking bike. And I kept my stock intake system, with the airbox and air filters.

Aside from all that EPA CRAP, you need clean properly gapped spark plugs and a nice strong battery. The VN750 has a weak ignition system, and it needs all the help it can get. I wish it were possible to install hotter coils to get a stronger spark.

If you have a carbureted bike, it is ALWAYS better to get rid of any emissions garbage it may have on it. That's my opinion, but I'm sticking to it.
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I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike

Last edited by VN750Rider/Jerry; 02-21-2020 at 07:17 AM.
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