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kz750 twin headers glow red when at high rpms
- nathanhopkins
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08 Jul 2010 06:50 #381007
by nathanhopkins
kz750 twin headers glow red when at high rpms was created by nathanhopkins
Through a ring replaced motor with 6000 miles.
Noticed while riding at stop idles high playing with that but also notice it leans out while riding. an oldtimer said i could lift needles a few clips on the slide that would help. any suggestions.
Note pod filters and custom exhaust are on bike.
help
nate
Noticed while riding at stop idles high playing with that but also notice it leans out while riding. an oldtimer said i could lift needles a few clips on the slide that would help. any suggestions.
Note pod filters and custom exhaust are on bike.
help
nate
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- bountyhunter
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08 Jul 2010 12:11 #381090
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic kz750 twin headers glow red when at high rpms
With pods and low restriction exhaust, you will need larger main jets. Stock mains on the BS-38's that go on a 750 twin is 125. You could probably go up to 135 - 140, that's just a guess. If yours is a 1979 KZ750B4 like mine, the needles are adjustable. Stock position is middle slot, you can drop to the bottom slot to go full rich but I don't think that will fix a glowing header problem. What you really should do is put a stock airbox on and a decent set of mufflers. Right now you are cooking more than the exhaust pipes.
1979 KZ-750 Twin
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- bountyhunter
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08 Jul 2010 12:13 #381094
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic kz750 twin headers glow red when at high rpms
nathanhopkins wrote:
That is typically caused by a vacuum leak which would make it run even leaner. The rubber intake manifolds in good shape? Check for leaks.Noticed while riding at stop idles high playing with that
1979 KZ-750 Twin
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- Patton
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08 Jul 2010 16:03 #381137
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic kz750 twin headers glow red when at high rpms
Would also verify correct ignition timing and that advancer unit is properly functioning.
Good Fortune!
Good Fortune!
1973 Z1
KZ900 LTD
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- nathanhopkins
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08 Jul 2010 20:33 #381198
by nathanhopkins
Replied by nathanhopkins on topic kz750 twin headers glow red when at high rpms
To first reply factory pipes and airbox not option. bike is totally customized its chopped motor is only original part. will try needles first . will check everything else though thanks guy
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- TeK9iNe
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08 Jul 2010 23:43 #381221
by TeK9iNe
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
Replied by TeK9iNe on topic kz750 twin headers glow red when at high rpms
Nah! Dont listen to these guys, ride it like that!
The glowing is cool at night... :blink:
No seriously, listen up
Get a whole bunch o' jets like 6 richer sets of mains, and 2 richer sets of pilots, and take that bike to a dyno and get to work. (Or use the old butt dyno).
Put in the richest sets and do a run, then decrease the sizes 1 at a time until no further performance is gained then stop, your done. Raise/lower needle as necessary for midrange power.
mains are for full throttle, pilots are cruise and smoothness at small throttle input, screws are for idle.
GL!
The glowing is cool at night... :blink:
No seriously, listen up
Get a whole bunch o' jets like 6 richer sets of mains, and 2 richer sets of pilots, and take that bike to a dyno and get to work. (Or use the old butt dyno).
Put in the richest sets and do a run, then decrease the sizes 1 at a time until no further performance is gained then stop, your done. Raise/lower needle as necessary for midrange power.
mains are for full throttle, pilots are cruise and smoothness at small throttle input, screws are for idle.
GL!
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- bountyhunter
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09 Jul 2010 11:38 #381275
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic kz750 twin headers glow red when at high rpms
The mains are REALLY hard to find. This is one source I found:
www.allensperformance.co.uk/mikjets.html
Main jets are four down from top.
www.allensperformance.co.uk/mikjets.html
Main jets are four down from top.
1979 KZ-750 Twin
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- Capt America
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10 Jul 2010 10:41 #381499
by Capt America
Capt A merica
1983 K1 750 twin
Ontario, Canada.
Replied by Capt America on topic kz750 twin headers glow red when at high rpms
Let me guess... not the double pipe original exhaust, but some single pipe aftermarket deal... yep ride it, the glow is cool at night. and crome looks cool with a nice blue tinge.
Seriously though, if it's a single pipe and if your plugs look in range I'd not fret to much over it... it's why they make the double pipe, so you don't see that pretty red glow and your crome stays nice an purty.
Seriously though, if it's a single pipe and if your plugs look in range I'd not fret to much over it... it's why they make the double pipe, so you don't see that pretty red glow and your crome stays nice an purty.
Capt A merica
1983 K1 750 twin
Ontario, Canada.
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- nathanhopkins
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11 Jul 2010 20:07 #381827
by nathanhopkins
Replied by nathanhopkins on topic kz750 twin headers glow red when at high rpms
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19 Jul 2010 11:55 #383848
by nathanhopkins
Replied by nathanhopkins on topic kz750 twin headers glow red when at high rpms
drilled out main jet to 140 bikes running great
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- steell
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19 Jul 2010 15:08 #383869
by steell
KD9JUR
Replied by steell on topic kz750 twin headers glow red when at high rpms
Color indicates temperature, so here's a color chart so you can determine how hot your pipes are getting. Keep in mind that aluminum melts between 1100 and 1250 degrees F depending on alloy.
.
.
KD9JUR
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