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1987 FZ 750


richard 72
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I own a 87 fz750 with 30k on it the bike is clean and runs like crazy when pushing hard but driving normal it has a bad scary dead spot in the throtle and its had a good mech tune and trouble shoot with no luck the yamaha dealer told me that bike was knowen for this prob. I have a hard time believing this does any one have any ideas. only thing that i have noticed is when its cold out theres almost no problem at all (Jetting ?)

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I own a 87 fz750 with 30k on it the bike is clean and runs like crazy when pushing hard but driving normal it has a bad scary dead spot in the throtle and its had a good mech tune and trouble shoot with no luck the yamaha dealer told me that bike was knowen for this prob. I have a hard time believing this does any one have any ideas. only thing that i have noticed is when its cold out theres almost no problem at all (Jetting ?)

I also cruise the FZX 750 and am experiencing the same especially at take off with less accerelation. But at a good speed the machine realy performs. May be i would like to know the fuel consuption if any one has an idea. thanks

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FZ750 is know for having very good fuelling as standard so maybe your bike has been jetted for a performance air filter &/or exhaust then had the original items refitted or you have performance items fitted with standard fuelling ? aftermarket exhausts are known to mess with the power curve on the FZ giving flat spots as you have described. Would seem that your air/fuel mixture is at fault if the problem is less evident in cold weather ? Dyno jet kit might help to smooth out your power delivery ?

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FZ750 is know for having very good fuelling as standard so maybe your bike has been jetted for a performance air filter &/or exhaust then had the original items refitted or you have performance items fitted with standard fuelling ? aftermarket exhausts are known to mess with the power curve on the FZ giving flat spots as you have described. Would seem that your air/fuel mixture is at fault if the problem is less evident in cold weather ? Dyno jet kit might help to smooth out your power delivery ?

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Thanks for the reply,

One of my exhoust pipe is getting heated up its actually changing color what could be the cause????

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