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Yamaha TT600 R nor starting Yamaha TT600 R nor starting
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 11 Mar 2010
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Yamaha TT600 R nor starting
Hi All, I am desperate....my decompression cable snapped so I have replaced it though the bike now does not want to start. I have tried to adjust the cable but I think that's not the problem, checked the spark plug and that's ok too. A friend of mine suggseted ignition timing or something like that. I do a bit of stuff my self though I am not a mechanic. any ideas?cheers!Frankie
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  #2  
Old 11 Mar 2010
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Hi



Have you had the bike for some time? Did it start OK before the cable snapped?

For how long has the bike been out of service? Do you have old gas in the tank?
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Old 11 Mar 2010
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if it started ok before and the only thing thats changed is the decomp cable then thats where the problem is

my xt starts ok without the decomp kit you just need to practise the technique a bit, so try that first then if it starts ok like that you know the engine is good you can always go back to re-setting up the decomp cable afterwards
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  #4  
Old 12 Mar 2010
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Hi if the bike has ben stood for a few days try draining the carb.
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  #5  
Old 12 Mar 2010
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Quote:
Originally Posted by bolla View Post
Hi if the bike has ben stood for a few days try draining the carb.
ahh that old chestnut stale petrol it's actually a bit misleading
petrol degrades at a slow rate at normal temperatures so it should be fine for a few months if the carbs were full at the last time of stopping so there is less air for it to evaporate into.

i'd still go down the route of sorting/eliminating the decomp cable first
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  #6  
Old 15 Mar 2010
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My TT600RE can be a right sod to start if it's been left for a week or two, when that happens I always find draining the carb solves the problem. Don't know if it's dodgy fuel in the carb or not but it always starts straight up afterwards so it might be worth a try. That said, i would imagine the problem would be your decomp in this circumstance.
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Old 15 Mar 2010
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paul sounds more like a vapour lock than stale fuel my kmx was the same but i fitted an inline fuel filter which allowed the fuel line to fill the carbs as soon as i turned the fuel on as it acted as an expansion chamber
plus its always good to have that extra filter in the fuel line
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Old 15 Mar 2010
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hmm, not too sure about that as it's always been the same whether I've had inline filters installed or not, and draining the carb in that instance always releases plenty of fuel. Should be worth a try either way as it's done in a few seconds. Funny old things carbs but I'll miss them when they all go.
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Old 12 May 2010
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Help with a TT600
I have a 1983 Yamaha TT600 that say for a long time (likely years) with gas in it. Previously, it started and ran very well. However, now after that has sitting that long, I have problems. I took the carburetor to a motorcycle mechanic to rebuild it, but he said that gasoline that sits a long time eats away the aluminum (I think is what it is) in the carburetor. He cleaned the carburetor but indicated that he thinks it is shot. Does that sound correct to you guys? I didn't know the gas would eat away the metal of the carburetor, I thought it would just gum it up.
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Old 12 May 2010
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Get some powerstart spray. Blast a good squirt onto the air filter and try again.

If it's fuel starvation then it will fire up straight away, if it's the decompressor thats the problem , it might not !!

btw, fuel does not go stale in a few days... It takes months and months and then it still burns well.

My DRZ is a pain to start if left for a a while too. It's due to vapour lock and the fuel evaporating out of the float bowl. Draining the bowl gets things moving again and 99% of the time, it fires up again.

It's down to the inline filter and bad angle of the fuel line. I'm going to fit a cheap vacuum pump to sort it.
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Old 12 May 2010
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Quote:
Originally Posted by Smith101010 View Post
I have a 1983 Yamaha TT600 that say for a long time (likely years) with gas in it. Previously, it started and ran very well. However, now after that has sitting that long, I have problems. I took the carburetor to a motorcycle mechanic to rebuild it, but he said that gasoline that sits a long time eats away the aluminum (I think is what it is) in the carburetor. He cleaned the carburetor but indicated that he thinks it is shot. Does that sound correct to you guys? I didn't know the gas would eat away the metal of the carburetor, I thought it would just gum it up.
He's talking out of his rectum !! Fuel gums and then hardens into a tarnish. I've NEVER heard of it eating aluminium.
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Old 13 May 2010
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I,m with ted on this...
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Old 13 May 2010
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Hi
Dont come on very often as i spend more time on the XT500 forum, i have a TT600R and there has been a post on here before about poor starting. If the fuel has been left on they can take 12 kicks to get going, tried it myself so now i make sure i switch of the fuel, correct fuel does go stail as the octane rating drops, also if the bike started OK before the broken cable then the cable could be over tightened leaving the valve open even when the cable should be slack on the compression stroke. Not the clearance the TT needs but my XT600 requires 0.5mm clearance on the cable.

Cheers Tommy10bikes
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Old 15 May 2010
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As a "well practised" (i.e start you basta**!) owner of TTR and TTRE's. I can confirm that if you don't turn off the fuel and leave the bike a few days, sweating and leg ache will ensue. I think it's to do with the fact that the carb sits on top of the very hot oil tank, I am told that this helps to evaporate some of the more volatile elements of fuel via the breather.
Try turning off the fuel as soon as you stop for the day, even if you idle it for a while it will probably not run out, some people swear by turning the tap off whilst riding, just before stopping. No matter the explanation, if she starts, all is well.
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