Question about 2000 Yamaha XJ 900 S Diversion

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Don't know where pipes go

4 vacuum pipe & 2 overflow pipes can anyone tell me where these pipes connect to as the bike is running rich & spark plugs are black

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  • mick_ann_bil Apr 13, 2009

    this engine has been put into a trike



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You should have 2 vac pipes which go to 2 mounts under the petrol tank the other 4 should go down the back of the airbox towards the swingarm.

Posted on May 19, 2009


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Why do i have to blow through the overflow tubes to get fuel into the cylinders to start my bike?

Hi, William and the usual suspects are:
1. Enrichner system plugged, not properly functioning or improperly operated.
2. Fuel overflow.
3. Restricted fuel supply.
4. Plugged slow jet or passages.
5. Inlet system air leak.
For more information about your issue please visit the websites below. Good luck and have a nice day.

Aug 15, 2015 | 1981 Suzuki GS 750 L

1 Answer

What makes my 2000 yamaha silverado die while riding

Look at the 3 main points... Is it getting air? Is it getting fuel? Is it getting spark?

Check the plug gaps and see what colour the spark plugs are (The colour will tell you if it running rich or lean). Also check for spark (and its colour) by check holding the plug against the head (be careful).

Check to see if the filter is blocked up (replace as they are cheap), also check for leaks from the airbox to the carb, run the engine and spray wd40 on the rubbers, if the engine changes speed there is a leak (new rubbers)

As for fuel, change the filter (always good). Then look for fuel flow through the pipes to the carb (unhook pipe from the carb and put it in a jar, open tap.... Then check the fuel pump, see if there are any loose connections, also when you turn the ignition on do you hear the pump?

There is a adjustment knob to change the idle speed, there are also fuel air screws in the carb themselves, if they are not plugged (american market plug them with brass caps) then they should be white plastic knobs behind the airfilter box on the carb... Turn these full in and then 2 turns out!

Also change the oil, old oil in these bikes (especially in winter) tends to effect running and cutting out may be a symptom.

Jul 05, 2014 | Yamaha V Star Classic 650 Motorcycles

1 Answer


Spark plugs are right color- due to 'drag pipes your bike no longer has the 'backpressure' required and this will result in pops and backfires when throttle is 'let go'- put factory pipes back on and it'll probably run like a champ-those hondas run forever-just don't **** around with factory specs-they don't respond well-if your lookin for a Harley sound-buy a Harley-if you want cheap reliable transport-leave your honda stock, good-luck.

Nov 10, 2012 | 1997 Honda VT 600 C Shadow

3 Answers

Coyote crx 50cc kids bike will not start, its a pull cord start and i have never managed to start it from new. It has fuel, it gets a spark, although it doesnt seem to be a very strong spark. Please s

Hi, Assuming the bike has been run before you owned it, pull off the exhaust pipe and try starting it. If it starts and runs, don't let it it run much more than 10 seconds or so. This will tell you that you have a classical clogged exhaust system. The pipes on little two-stroke engines are very small and easily get filled with wet gooey carbon deposits. White kerosene is affordable and works good for cleaning. Plug on end of pipe and fill from the other end untill it is full and let soak for a period. The best approach is to take apart the pipe to clean really thoroughly. Hope this helps. Denis

Feb 11, 2012 | Cars & Trucks

1 Answer

Ihave a 1979 1000cc sporty with a as supper e shorty carb that was revolt last winter it was running fine till last month it's been back fireing from the exhaust pipes and air filter the plugs are good...

Backfiring out of the exhaust pipes usually indicates an ignition problem. What happens is that the fuel air mixture in the cylinder is not burned and is exhausted into the exhaust pipes. The next time the cylinder fires and the exhaust valves open and allows the residual flame to exhaust into the pipe, it ignites the unburned fuel in the pipe from the previous misfire. What kind of igniton system is on the bike. And, spark plugs will foul within minutes in an Ironhead Sporty if the mixture is too rich. Your super "E" is still a quite large carburetor for that engine. It should have a #26.5 slow jet and a #66 main jet. Make sure that your accelerator pump is not adjusted to put too much fuel in the cylinder when you open the throttle. Go to S&S's tech site and download files 51-1012 and 51-1013. This will tell you everything you need to know about your carb. If you are running open drag pipes on your Ironhead, you don't have enough backpressure on the exhaust system and you've probably got a flat spot at about 55-60 mph. If so, look on the backside of the exit end of the pipes. There may be a hole in the pipe for the bolt to hold the baffles in the pipe. If this hole is open, install a 1/4" bolt that is 1 1/4" long in the pipe with three nuts on the bolt on the inside of the pipe. Put one of these bolts in each pipe. This will give you just enough backpressure to almost eliminate the flat spot and the bike will perform much better. Due to the hemispherical design of the heads, the Ironhead must have some backpressure. I hope this helps.

Good Luck and Ride Safe

Sep 11, 2011 | 1979 Harley Davidson XLS 1000

2 Answers

My ironhead sportster's tail pipes are heating up so much that they started to glow after only about 2 minutes of the bike i hurried and shut it down right away but don't know where to...

Hey beast, what part of the pipe is glowing? You running straight pipes, if so how long are they? A rich fuel mixture wil cause the pipe on the rear cylinder to get hot like that, most often on hard acceleration, or high speed riding....Also carbon build-up on the inside of the pipes and creates an inferno.

Aug 31, 2011 | Harley Davidson XLH 1000 Sportster...

1 Answer

I have a 1998 kawasaki 1500 classic that runs rich to the point where the fender is turning black. Riders behind say they smell strong odor of unburnt fuel. Bike idles smoothly and does not fog black out...

The easiest way to tell is have a look at the spark plugs and see what colour they are.
The should be a light brown, if black then you are running rich and will need to adjust your carbs.


Please dont forget to vote this answer was helpful.

Many thanks


Mar 04, 2011 | 2003 kawasaki VN 1500 Vulcan Classic...

1 Answer

Have changed the exhust to a short pipe and i know that the bike will hacve to be retuned witha after market air filter , but have been told that the KAWA'S NEED A POWER COMANDER to remap the fuel...

If you want the bike to run at top condition YES it is the only way with out putting on even more expensive fuel injectors. Power commanders are made for all bikes, anyone that ever changes there pipes from stock to any aftermarket pipe should buy a power commander and retune bike, plusyou will get all the advertised horsepower from the pipes and increase fuel performance from it. Power commanders are fairly cheap compared toooo you burning out fuel system because it runs to rich or clog it by runig to lean....go with power commander and in about 4 hours it will run great ( thats install and retune time)

Jun 22, 2009 | 2005 kawasaki Z 1000

1 Answer

I have a 1996 harley davidsin FLHP with electronic fuel injection. I need to know how to adjust the fuel injection to run different exhaust pipes.

If your stock air cleaner has not been replaced you should be able to install the pipes with no adjustments. Run the bike a few miles and check your spark plugs. They should be a nice tan color. If they are too dark, your bike is running rich, too light means its running lean. Either way the ecm download from harley should fix you up. At that point you should get the screamin eagle ac kit and down load.

Mar 08, 2009 | Harley Davidson FLHRCI Road King Classic...

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