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We put new seals in the exhausts and clamped the crossover tube and the 'thump' is gone and the engine does idle but sounds slightly unhappy and gives the occasional backfire 'pop' I took it for a spin around the block and while it runs it seeems to be straining and vibrating when you try to open the throttle, my thoughts are that the carbs need balancing after standing so long. Any comments as I have never been close to one of these beasts before much less ridden one so don't know what it feels like or sounds like

Someone suggested Diesel injector cleaner instead of seafoam but I am wary of destrying seals etc. will this be OK

Regards Rob
 

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Congratulations mate, about the carbs, the best would be to take them out and clean them. nothing works better than that, if you do not have a gauge to sync them, you could at least do what they call. bench sync.
 

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I'd stick with Sea Foam for a fuel system cleaner, there may well be other kinds that work okay and are safe but so many members here have had good results with Sea Foam without any damage it looks to me like the best way to go. Checking the carb synchronization would be worth doing. These bikes are not pleasant to operate with the carbs much out of sync.
 

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exavid wrote:
I'd stick with Sea Foam for a fuel system cleaner, there may well be other kinds that work okay and are safe but so many members here have had good results with Sea Foam without any damage it looks to me like the best way to go. Checking the carb synchronization would be worth doing. These bikes are not pleasant to operate with the carbs much out of sync.
Hi Paul. I suggested diesel injector cleaner because those poor buggers cant get sea foam there:shock:
 

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I think you have to synch carbs with gauges because i bench synched my carbs after rebuild and then checked with gauges and wow they were off. Bike didnt run very well either although it would run. After synch with gauges it runs a ton better. carbs need to be synched on each side as a couple and then all together because each cylinder has diffirent compression. Thats how i did mine at least.
 

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hatchetman wrote:
Hi Paul. I suggested diesel injector cleaner because those poor buggers cant get sea foam there:shock:
Ah, I forgot about the deprived. I should have noticed miroku800's location. I guess it was his excellent use of English that threw me, one just naturally expects someone with a good grasp of the language would live in North America.:cooldevil::cooldevil::cooldevil::cooldevil::cooldevil::cooldevil:
 

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They "are" in North America Paul :cheeky1:

It's just that there is a tiny river in between them and us :cooldevil: :cooldevil: :cooldevil:
 

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AZgl1500 wrote:
They "are" in North America Paul :cheeky1:
It's just that there is a tiny river in between them and us :cooldevil: :cooldevil: :cooldevil:
NowI am confused John, I was referring to miroku800 who appears to be an Englishman or resident thereof. I was surprised he writes understandable English, that fellow from Croydon often doesn't.:cooldevil:
 

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exavid wrote:
AZgl1500 wrote:
They "are" in North America Paul :cheeky1:
It's just that there is a tiny river in between them and us :cooldevil: :cooldevil: :cooldevil:
NowI am confused John, I was referring to miroku800 who appears to be an Englishman or resident thereof. I was surprised he writes understandable English, that fellow from Croydon often doesn't.:cooldevil:
Cheeky b----r

Ah will hev yee knaa tha wi in the north of england were learnt te speak in the proper way not leik them heathens tha borrow wor language in other parts o the cuntry an world

I am a true Geordie :clapper:( born within sight and SMELL of the Tyne)

But back to the point I have arranged to borrow a carb balancer for the weekend so will see what transpires and will put some more fuel in the tank with a little injector cleaner and then try the 'colortune' to check mixture, and we shall see what happens

If it 'blows up' I shall 'sue the pants off you' that being the American way :D
 

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hatchetman wrote:
exavid wrote:
I'd stick with Sea Foam for a fuel system cleaner, there may well be other kinds that work okay and are safe but so many members here have had good results with Sea Foam without any damage it looks to me like the best way to go. Checking the carb synchronization would be worth doing. These bikes are not pleasant to operate with the carbs much out of sync.
Hi Paul. I suggested diesel injector cleaner because those poor buggers cant get sea foam there:shock:
Just out of curiosity would diesel injector cleaner have the same effect as seafoam?
 

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What about trying Redex this may be similar to seafoam, not sure but may be worth a try.

Terry (Fellow Geordie)
 

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We had a similar problem with our 79 GW and we used Lucas gas treatment. Its kinda expensive but it did the dirty deed. Of course we will take the carbs out in the fall and have them cleaned but this short fixed really worked.
 

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Crikey!. Haven't heard of Redex in 50 years. Used to use it in my '56 Ford Popular.

OG (son of a Geordie)
 

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If you can get your hands on a bottle of the stuff, what you need is "Forte fuel treatment" damn near impossible to buy as it is trade only, but if you can find a local garage that will sell you a bottle ( about £14 +VAT) it is brilliant stuff.

My pet mechanic uses it and I couldn't believe the difference when he ran it through the system on my 1500. She was running pretty good, but an application fo that Forte made a world of difference.



Failing that, pop into your local Yamaha dealer and buy some Yamaha carb cleaner
many people swear by that too.
 

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T.Hambley wrote:
You can get "Forte fuel treatment"on E bay £10 a bottle plus postage.



Terry
Well found Terry, worth the money I reckon!!:clapper:
 

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Silverfox wrote:
Failing that, pop into your local Yamaha dealer and buy some Yamaha carb cleaner
many people swear by that too.
I've heard the Yamaha stuff has changed, I'm told it is now watersoluble and can't be mixed in the gas.

Don't know for sure, I haven't checked, but this is what I was told.
 

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Yes there is the "old" Yamaha carb cleaner. You mixed it 1 part cleaner with 3 parts gas. Then there is the "new" cleaner. Doesn't work the same.

John
 
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