Question about 1984 Honda vt 500 ft ascot

2 Answers

Vt500 engine has a loud knock wen engine is running and gets faster with RPM increase drained oil no metal on mag plug or in oil

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.


    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 12 Answers

You may have solved this by now, but need to know a couple of things.
Does the knocking noise increase with rpm or speed?
If just rpm then it could be bent valve or valve timing
If just speed, could be drive train related Make sure carbs are balanced this can produce massive vibes on v-twins (I know from my Firestorm!)
As mentioned by heimlich it may be that one of your cct's are knackered.

Posted on Dec 03, 2010

  • Anonymous Dec 03, 2010

    Hi, You may have solved this by now, but need to know a couple of things. Does the knocking noise increase with rpm or speed? If just rpm then it could be bent valve or valve timing If just speed, could be drive train related Make sure carbs are balanced this can produce massive vibes on v-twins (I know from my Firestorm!)

  • rwillard59 Dec 04, 2010

    Hi problem is not solved yet the knocking is in the engine and does increase with the rpm
    bike in neutral give some gas the knocking gets faster. Just got the motor out of frame
    now riding season is over and the vt750 is put away, I now have time to work on this bike
    Thanks for your reply, any suggestions are appreciated.


  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,978 Answers

You are probably dealing with a bad automatic cam chain tensioner.

Posted on Oct 24, 2010


1 Suggested Answer

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Engine noise

No miracle fluid in a bottle is going to fix a loud engine knock. Get it diagnosed

Mar 05, 2018 | Buick Cars & Trucks

1 Answer

1997 cutlass supreme started making a knocking noise could it be oil pan

constant heavy knock that gets louder and faster with increased rpm
possible big end bearing failure
if it just happened as you drove over the gutter and it knocked could be a suspension part loose

Oct 01, 2016 | 1997 Oldsmobile Cutlass Supreme

1 Answer

Driver side rattling noise disappears as speed up very loud when slow down coming from engine its a mini cooper 56 plate with only 31000 on the clock

It can be a number of issues if the noise is engine related but have the oil pressure checked with an external oil pressure gauge.
Most mechanics will have them.
I would also change the oil and oil filter immediately and ensure you ONLY use the correct oil as specified by the manufacturer for that engine. (Using an incorrect formulation or the wrong grade will cause engine issues).

I suspect the engine is losing oil pressure and oil flow at low RPM and you are getting metal to metal contact on the top end of the engine when this happens as the low pressure is producing a lack lubrication to the upper end of the engine. At higher RPM the oil pressure increases as does the oil flow and the noisy internals are getting sufficient lubrication again or at least enough to eliminate metal to metal contact and stop the rattling.

Dec 19, 2015 | Cars & Trucks

1 Answer

Clanging noise while running

A rhythmic metal on metal noise in an engine usually follows a classic rule: valves tap and pistons knock. If the noise is rhythmic with the speed of the engine and incrementally increases when the engine speeds up, then it is one of these two issues. All you need to answer in this case is whether your noise is a tap or a knock. On the other hand, if the clanging sounds more like an old diesel engine and increases in volume when the engine accelerates, then the problem is pre-ignition. If the problem is simply pre-ignition, then you will need to check your ignition system, including the knock sensor, crank sensor, and all your spark plugs and coils. This is the simplest thing to do first. Unplug each coil one at a time to verify that the engine loses power for each one. Valve tap can be caused by lifters or a broken valve spring. To diagnose this, you need to remove the valve cover and check the lifters. Are any loose when you try to move them up and down by hand? Engine knock signals that your engine needs to be rebuilt with new piston rods and bearings. It is not a good idea to drive very long with either condition or you could end up causing more damage and get stuck on the side of the road.

May 23, 2012 | 1995 Buick Regal

1 Answer

2000 pontiac grand prix gtp supercharged stalling and loud knocking nois on passenger side

You may have damaged the engine. So that being said either a bad rod bearing or other issue may be something needing to pull the engine. How is the oil pressure. A rod knock is east to hear. To faster the rpms the worse the sound. Rebuild or replace.

Feb 11, 2018 | Cars & Trucks

1 Answer

I just turned on my car after being out of town for a few days and it made a loud knocking sound and the service engine light is on. It has never made this sound before. It's not the weather.

alot of times when you let a car sit for a while, the oil will slowly drain down into the oil pan. When you start the engine, the knocking you hear is all the metal parts flying around, waiting for the oil pump to start spraying the oil everywhere. If you start it back up, let it run for a minute and listen for the noise to quieten down, it should eventually go away. You can help prevent the dry start as you are having by using good synthetic oil, and sometimes adding in LUCAS oil treatment.

Dec 30, 2011 | 2007 Mitsubishi Eclipse

1 Answer

Ok. Last night my car started making a knocking noise. Its not loud and only happens when im in idle. Also it seems to come from the bottom of the engine. Help?

if it gets louder and faster as the engine speed increases then a piston is knocking...if it is just at idle like you said then it could be a bad oil pump if oil light is on at idle or it could be the connecting rod knocking on the crankshaft because it is loose.

Oct 23, 2010 | 1999 Pontiac Sunfire

1 Answer

The engine is making a really loud knocking noise and the oil light is on. it also smells like something is burning or running hot

Doesn't sound good. Check oil level. Also check for metal in the oil once you pull the dipstick. A loud knocking noise is a sign of a blown engine may be you spun a rod in which case you would need engine replacement or rebuild

Oct 23, 2009 | 2001 Dodge Stratus

1 Answer

Kx250 gearbox/drianplug leaking

There is pressure in the crankcase when the engine is running and when you rev it up this pressure increases. Oil pressure inceases with RPM and yes the oil will get frothy under pressure.

If you suspect the drain plug is leaking then remove the plug and wrap the threads with teflon tape and reinstall the plug, this should prevent the plug from leaking.

Jun 06, 2009 | kawasaki KX 250 Motorcycles

1 Answer

When you start the engine runs fine at idle but when you increase the RPM to 2000 you will hear a knocking sound from the engine.It sounds like the cams or the crankshaft. The engine was not running for...

Crank and cam make different noises when going bad, however if the crank is bad it will knock all the time even at idle. From what you told me it seems like the lifters are not making pressure, after all the car was sitting for 4 years. What you can do is to drain some of the engine oil about a quart, then fill it with some trans oil yep I said tranny fluid and let it run for about half an hour. This will wash out the lifters and hopefully take care of your problem. Oh, don't forget to drain and fill the oil again after noise goes away.

Mar 18, 2009 | 1987 Toyota Supra

Not finding what you are looking for?
1984 Honda vt 500 ft ascot Logo

521 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

5948 Answers


Level 3 Expert

85206 Answers

richard libby

Level 2 Expert

209 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides