20 Most Recent 2008 Yamaha Yamaha G5 Questions & Answers

Have you checked the carb boots for cracks?
the fuel screw under the block off plug? Remove the plug and set the fuel screw to 2 to 2.5 turns and hopefully you'll see a difference on starting,warming up and idling in the cold.

2008 Yamaha... | Answered on Jan 21, 2018

Did you accidentally cross the spark plug wires?
Other wise its going to be hard to diagnose,
Do you have plenty of compression,
Are you getting gas to the spark plugs?
Is the air filter clean/new?
You will need a factory service manual to diagnose further if all the above is ok

2008 Yamaha... | Answered on Jun 06, 2017

Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

2008 Yamaha... | Answered on Jul 18, 2014

say you have a small man inside your motor with a hammer banging away ???

2008 Yamaha... | Answered on Dec 29, 2013

have your carb cleaned and balanced, replace the piston rings and decarbonize the block that should do it, and also you can change your spark plug just incase

2008 Yamaha... | Answered on Dec 23, 2013

try climbing in 2nd and 3 rd gear. remember lower the speed lower the gear

2008 Yamaha... | Answered on Aug 26, 2011

Have you check the choke position?
When you got it going does it rev up high immediately, if yes then you choke is stuck wide open.
Good enough?

2008 Yamaha... | Answered on Mar 06, 2011

Sorry but your question is listed as a computer problem? If you have a motorcycle question please ask it again with a proper heading! Thanks

2008 Yamaha... | Answered on Feb 19, 2011

It will be less than 500 ml per leg.
Fork oil is sold in 1l bottles

Drain each for leg in turn and measure qty coming out in jug.
Alternatively make sure front end is raised.
Take off the fork caps, take out the springs and use a dipstick to find how far down the oil is.
Empty each fork and refill to same mark.

2008 Yamaha... | Answered on Feb 05, 2011

you might try tradebits.com you may have to pay 5-6 dollars for it but it is an instant download and you will have it then.

2008 Yamaha... | Answered on Nov 05, 2010

Its best to stick with standard sizes as Yamaha put a lot of research into finding the best tyre sizes for each model

Ride Safe

2008 Yamaha... | Answered on Sep 29, 2010


If the engine dies completely when you put in gear, check the kickstand switch. This can be tested jumping its contacts, the problem should disappear.

If instead the bike is running only with choke on, that is a carburetor problem. Check mixture regulation, eventually check fuel filter, air filter and fuel lines and clean the carburetor body.
This bike is known for having very lean settings from factory (carburetor mixing little fuel and more air). Read this article on the G5 carb problem.

2008 Yamaha... | Answered on Sep 02, 2010

Hi this site is to solve problems with your bike, but my advise is dont use one card to pay another, it will cost you more and puts your balance further behind

2008 Yamaha... | Answered on Aug 24, 2010

make sure enough petrol is getting to your carb, check the fuel line going from your tank to the carb make sure it is completely free nothing bloacking it t all, nd if that does not work buy some carb cleaner :)

2008 Yamaha... | Answered on Aug 01, 2010

sounds like a wiring problem to me.

2008 Yamaha... | Answered on Jul 28, 2010

Is there oil in the gearbox? Is it really dirty? Lack of oil and dirty oil could account for the clutch problem. If you have put synthetic lubricant in the gearbox that could also account for the clutch. Synthetics can swell the cork on the clutch plates. New fiber plates would be needed.

The shifting problem could be tied to the lack of oil or dirty oil but usually the problem is bent shift forks. If fresh oil doesn't fix the clutch the clutch will need to be inspected/repaired. If that doesn't also fix the shifting, ( and I don't think it will ), the engine will need to be torn down and the shift mechanism inspected. Forks will likely need to be replaced.

2008 Yamaha... | Answered on Jul 15, 2010

Check magneto plate

2008 Yamaha... | Answered on Jul 06, 2010

Remove the allen plugs and turn the holes downward (6 o'clock position) to drain the old oil. Fill with Polaris Direct Drive Hub fluid and turn the hole to the 8 or 4 o'clock position to remove excess oil.

2008 Yamaha... | Answered on Jun 21, 2010

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