Question about 2002 Honda VT 750 DC Shadow Spirit
I have an 05 750 sprit on the top of the carbs it has 4 rubber lines coming off the top with two lines going to a small breather box on the front and the other two are coupled with a tee with that line open, when idle it runs rough untillyou restrict air to this line but if you stop it up altogether the engine dies. What do I do!!!!!!!!!!!!
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Posted on Jan 02, 2017
SOURCE: re jet carbs? any help?
if you rejet the carbs. i would maybe take a plug reading. it sounds as if you might have gone too rich and the plugs began to foul. but a good plug reading will tell alot. if they appear to have a good tan color i would take a look and make sure no hoses are being pinched causeing a fuel starve problem.
fyi. if you just put on an aftermarket exhaust. sometimes you wont need to jump up in jetting that much. stay around the stock jetting and maybe shim the slide needle up a hair with a tiny washer. that usually puts you close. unless an elaborate aircleaner system and very high flow exhaust.
Posted on Mar 24, 2009
Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.
Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.
Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.
SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.
With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.
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Posted on Mar 30, 2009
SOURCE: Fuel from engine breather pipe
There are just three ways for fuel to get into the top end. As mentioned, bad valve guides (exhaust guides are just as old as the intake guides). Bad rings with raw fuel getting past the rings. Either way, fuel is getting up there. Time for a valve job and fresh bore with new pistons and rings. If able to find the parts, I would also install new cam chain and tensioner. You have a very early CB450. Today's VIN numbers have 17 numbers. That is what didn't seem right.
Go to the site below where you can see a parts diagram for your specific bike. I already checked and a lot of parts are available for your bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
You can also Google 'vintage motorcycle parts honda" and find stuff there.
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Posted on Jun 10, 2009
On most bikes, opening the pilot needle screw actually leans the mixture , as it is an air screw, not a fuel screw. I'm not for sure that this is the case in your bike, but if you can find out exactly what carb it has, I can tell you. Also, a freshly rebuilt engine is going to idle erraticaly until the rings are seated and broken in. Be sure to check your carb boots and vaccum lines for cracks and leaks, as a vaccum leak can cause a lean condition.
Posted on Sep 12, 2009
Sounds like a loose piece of crud in the main jet. Have you had the jet and tube above it out? It could also be a spark problem. See if you have spark when it tries to die ( put a nail in the plug boot and get it sparking 1/4" or so to the plug at idle then rev it up, it should continue jumping. I think that bike will also have mechanical spark advance on the rotor on the end of the cam. If the springs are loose on that the spark timing will be all over the map and can make it run intermittantly.
Posted on Oct 03, 2009
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