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« on: 15 January 2020, 12:50:30 pm »
Hope you guys can give me some ideas how to fix my bike Fazer 600, mark 1, 2000 reg
Last year I cleaned my bike with the engine running (due to previous issues with electrics on other bikes) and the fuel was lower that I thought. Two days later I went to take the bike to get a rear tyre and the bike struggled to start and barley ride able. Managed to get back from the tyre shop and clean the carbs up enough to get it working enough to go on my trip to Germany, Ok at motorway speeds but struggled on the lower speeds.
When I got back I gave the carbs to my mate who took them apart. Said the Sliders/needles were a bit loose and could do with new ones. Official replacements from Yamaha are worth half the cost of the bike and unable to find any kits that contain the jets etc but found a decent set of replacement carbs on ebay. My mate has taken bits from both set of carbs and make the best we could into one set this has been sonic cleaned before reassembly.
Fitted the carbs but the pilots were not set to factory setting, balanced the carbs and the bike sounded back to normal. While test driving it showed there was a problem. Around 4.5 to 5000 rpm the bike struggles with acceleration and seems to stutter. When you eventually get over the 5000rpm marker the bike takes off again. This only happens when the bike warms up and you slowly accelerate.
If the bike is cold or you accelerate hard from a standing still there is no issue. Talked to a few people and they advised just to ride the bike for around 500miles for the carb bits to bed in. This made sense to me but I know the pilots were out. Compared to what it was when I first had the problem is was certainly worth putting up with for the time being.
Finally had 5 mins to myself last weekend and the pilots had been playing on my mind, took the carbs off as I have no adjuster tool and reset the pilots to 2 turns out. Put an inline fuel filter on as well as a back up to the original fuel filer and I can see if there is any issues with the fuel. Balanced the carbs, all sounded good rev'd through the ranges etc.
Took it out last night. Again when cold its like it was like before, accelerates through the previous problem of the stutter, fast and slow.... then the bike warms up and the issue is still there, plus a new one.
When stopped at traffic the revs have started sticking at 2000 rpm, I play with the rev adjuster on the carbs and it settles down again but this kept happening a few times.
Lastly when on tick over the rev counter pusles and bobs up and down a little. Idle rev's sett to the manual. This never happened before
Any ideas what to do next?
As the issue seems to be when the engine warms up is it now something with the engine as the carbs seem fine when its cold and when being rev'd in the garage.
A further note, the book says to set the carbs between 230 to 250mm but when I have balanced them and my mate has balanced them they only go to 125mm. I can't see how to get them any where close the service manual's recommendation.
Penny for your thoughts, Ive looked at several forum notes and not sure what to do next.
Cheers
Darren