Question about 2004 Honda VFR 800

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Exhaust port clean

Honda VFR 800 1998 fitting a new exhaust system and noticed that number 3 exhaust port is very clean but the other 3 cylinders had some carbon build up is this normal or what could it be at fault?

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Check your valve clearances as soon as you can to eliminate problem from those.

Posted on May 28, 2009

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start with a new spark plug and clean air filter, then if no better, remove exhaust and look into engine through exhaust port, if there is black carbon build up in the exhaust port remove it with a scraper, don't touch piston, don't let people tell you to cut open the exhaust muffler

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Homelite mighty life

The hottest part of the cylinder is around the exhaust port, so if it has partly seized you will see some damage/ piston scuffing by removing the muffler and taking a look through the open exhaust port, any sign of damage and you need to decide if its worth taking apart and fitting new parts, you may get away with cleaning any alluminium stuck the the cylinder wall and fitting a new piston, if there is no sign of damage you may have been lucky.

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You could fit any exhaust, But exhausts are designed for specific engines for a reason. They work best when they are used on the correct engine. Lots of things are taken into account when designing an exhaust, such as capacity, rev range and number of cylinders. An exhaust from a Honda SS50 wouldn't work on a Fireblade, so buy the correct one for your bike, it will be worth it.

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I turned my 2003 Honda VFR on this morning and i heard a rattling in engine. I turned it off and turned it back on and it went away. should i be worrying?

It could have just been a small piece of carbon flaked off inside the cylinder and was in between a narrow space between the piston and head or between the exhaust valve and seat but broke loose and blew out the exhaust

Aug 19, 2010 | 2002 Honda VFR 800

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Ive got a 1998 Honda vfr 800. In 6th gear there seems to be a hissing noiose coming from the motor. Its only under acceleration and doesnt happen in any other gear. Its not the typical V4 sound - like a...

It could very well be a leaky exhaust system. Today's exhaust systems are made up of various pieces that interconnect to each other. Some of the connections have gaskets, others don't. Most of the time when you've got a leaky exhaust system, you'll also start getting a popping noise out the pipe when you back off the throttle at high speed. Go around and tighten everything up and check for leaks for passing your hand around each connection with the engine running. Don't burn yourself. Keep in mind that the exhaust system expands when it gets hot and it might not leak cold but start when it gets hot.

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2003 Honda CR 250 R oil leaking front of the exhaust pipe

Hi, Anonymous and the usual suspects are:
1. Engine oil over filled.
2. Piston rings worn past service specs.
3. Broken piston rings.
4. Piston pin retaining clip failure.
5. Cracked piston.
6. Broken piston ring lands.
7. Hole in the piston.
8. Valve/guide clearance worn past service specs.
9. Worn out valve seals.
10. Crushed or loose valve seal.
11. Gouges in cylinder walls.
12. Cracked cylinder or head.
13. Blown head gasket.
14. Crankcase breather blocked or hose pinched.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
2003 cr250r exhaust leak at exhaust port
Need help trying to reduce excess spoge 2002 CR250R
CR250 2002 2003 pdf
Honda CR250R Owner Manual Competition Handbook

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Try a compression test of your cylinders ,and check your valve clearances .

Apr 26, 2010 | 1988 Honda VFR 400 R NC24

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Firing order

These things operate on what is known as a wasted spark system. There are two coils each one has two spark plug leads coming from it. One of the coils fires cylinders number 2 and 3 the other one fires cylinders number 1 and 4 . Each coil fires both leads at the same time. Hence one of the sparks is wasted each time. If you could see the pistons going up and down in the bores you would notice that numbers 1 and 4 go up and down together and that numbers 2 and 3 go up and down together. When 1 and 4 are at the top. 2 and 3 are at the bottom. and vicea versa . If number 1 is on the firing stroke number 4 will be on the exhaust stroke. Also the same for number 3 (firing) number 4 (exhaust) Thats not exactly what you asked i know. But i think it will help you to understand how the plugs fire on most Japanese across the frame 4 cylinder motors.

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87 Aspencade 1200 backfires between shifts and backfires deceleration and acceleration. Have had carbs cleaned and replacement kits installed. new spark plugs. synchronization of carbs also. Checked...

check for leaks around the exhaust headers,mine did what yours is doing,i replaced the copper exhaust seals in the head(exhaust ports),air is getting into your exhaust system and it mixes with the unburnt fuel and ignites causing the backfire,i replaced copper seals(about $2nz each) and problem went away

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1 Answer

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need to replace the carb rack or get them completely rebuilt. If cleaning doesnt help, and a few of your pilots are actually damaged to a point where removal is impossible without some manner of special tool you need.

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