engine speed issues
Moderators: Site Director, FZR Forum Moderators
engine speed issues
87 FZR1000 runs strong and powerful to 7000 rpm, after that its like i hit a rev limiter. any ideas? carbs seem ok.
1988 FZR 1000 (Basketcase)
Re: engine speed issues
Please help
today, i get to 7500 rpm, starts spitting and stuttering like usual, i give it a little more, nothing. all of a sudden i hear and feel a pop, the bike suddenly revs to like 9k, smooth power, nice!!! i can pull clutch and rev it up to 10k sometimes now and sometimes it stutters at 7500 again. mostly under load it will not rev that high but sometimes it will break 9k but roughly. carbs? ignition? ignitor? plugs are in nice shape. wfter i got it revving tonight, the pipes got extremely hot!
today, i get to 7500 rpm, starts spitting and stuttering like usual, i give it a little more, nothing. all of a sudden i hear and feel a pop, the bike suddenly revs to like 9k, smooth power, nice!!! i can pull clutch and rev it up to 10k sometimes now and sometimes it stutters at 7500 again. mostly under load it will not rev that high but sometimes it will break 9k but roughly. carbs? ignition? ignitor? plugs are in nice shape. wfter i got it revving tonight, the pipes got extremely hot!
1988 FZR 1000 (Basketcase)
Re: engine speed issues
I would say carbs. Is it jetted? Adjustable needles installed?
Duane...
Bike:
1994 Yamaha FZR 1000 EXUP
Factory Pro Stage 1 Jetting | K&N Filter | Corbin Seat | ProTek Keyless Gas Cap | GSXR Mirrors
My Thread
Cage:
2005 Saab 9-7x 5.3i Arc AWD
THE WIKI IS YOUR FRIEND
THE SEARCH IS YOUR SIGNIFICANT OTHER
USE THEM!!
Bike:
1994 Yamaha FZR 1000 EXUP
Factory Pro Stage 1 Jetting | K&N Filter | Corbin Seat | ProTek Keyless Gas Cap | GSXR Mirrors
My Thread
Cage:
2005 Saab 9-7x 5.3i Arc AWD
THE WIKI IS YOUR FRIEND
THE SEARCH IS YOUR SIGNIFICANT OTHER
USE THEM!!
Re: engine speed issues
not sure, was told they arent original, has pods though. they are definitely mikunis, i think they might be slightly larger than stock.
1988 FZR 1000 (Basketcase)
Re: engine speed issues
It has pods? Probably jetted. That is usually the case with pods. Stock size is 38mm for the 1K (both the Genesis and the Exup) unless they are flat sides which then they'd be bigger than stock. You should at least clean them and make sure all your jets are clear. Had that issue with my 1K recently and cleaning them did wonders.
Duane...
Bike:
1994 Yamaha FZR 1000 EXUP
Factory Pro Stage 1 Jetting | K&N Filter | Corbin Seat | ProTek Keyless Gas Cap | GSXR Mirrors
My Thread
Cage:
2005 Saab 9-7x 5.3i Arc AWD
THE WIKI IS YOUR FRIEND
THE SEARCH IS YOUR SIGNIFICANT OTHER
USE THEM!!
Bike:
1994 Yamaha FZR 1000 EXUP
Factory Pro Stage 1 Jetting | K&N Filter | Corbin Seat | ProTek Keyless Gas Cap | GSXR Mirrors
My Thread
Cage:
2005 Saab 9-7x 5.3i Arc AWD
THE WIKI IS YOUR FRIEND
THE SEARCH IS YOUR SIGNIFICANT OTHER
USE THEM!!
Re: engine speed issues
ill give it a try when i can park it long enough, 
1988 FZR 1000 (Basketcase)
Re: engine speed issues
UPDATE!!! turns out that im low compression on cyl 4! Ughhh, I dont have time for this. Oh well.
what are stock jet sizes on a 87 genesis 1000? mine had 110's in it, i upped to 115's.
what are stock jet sizes on a 87 genesis 1000? mine had 110's in it, i upped to 115's.
1988 FZR 1000 (Basketcase)
Re: engine speed issues
How low are you talking?josbourn1 wrote:UPDATE!!! turns out that im low compression on cyl 4! Ughhh, I dont have time for this. Oh well.
what are stock jet sizes on a 87 genesis 1000? mine had 110's in it, i upped to 115's.
And, did the jets make it worse? Or better?
http://www.michiganmobileservice.com/
“A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.”-Douglas Adams
http://www.youtube.com/user/reelrazor
“A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.”-Douglas Adams
http://www.youtube.com/user/reelrazor
Re: engine speed issues
cyl 4 was running 90-100. jets didnt change anything but now i have spun a bearing!anyone have a used engine? how about this; can i fit an R1 engine in somehow?
1988 FZR 1000 (Basketcase)
Re: engine speed issues
UPDATE.
Replaced with a used engine and it runs good. installed my old carbs and it still wouldnt rev so i installed the carbs that came with the new motor which are from a different model. i believe the new carbs are from an exup motor (new engine was a genesis stuck in a 94 exup frame). well, the new carbs allow the motor to rev to its full capability but arent a perfect fit on the bike. when i got my bike the guy said the carbs werent the right ones, im guessing they were too small. does anyone know the stock sizes, numbers, etc...? the ones on there now work but id love to find stock carbs.
thanks in advance.
Replaced with a used engine and it runs good. installed my old carbs and it still wouldnt rev so i installed the carbs that came with the new motor which are from a different model. i believe the new carbs are from an exup motor (new engine was a genesis stuck in a 94 exup frame). well, the new carbs allow the motor to rev to its full capability but arent a perfect fit on the bike. when i got my bike the guy said the carbs werent the right ones, im guessing they were too small. does anyone know the stock sizes, numbers, etc...? the ones on there now work but id love to find stock carbs.
thanks in advance.
1988 FZR 1000 (Basketcase)