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1983 Gpz 27k Starts but No Power!!
- kosh3rhalal
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30 Oct 2016 00:20 #746510
by kosh3rhalal
1983 Gpz 27k Starts but No Power!! was created by kosh3rhalal
Wassup Kz Family,
brought a 550 gpz H2 back from a long hibernation (10+ years): Adjusted valves, cleaned carbs, new uni filter, stock airbox+ new boots , Assembly lube on top end, new battery, new plugs, new fuel and vaccum lines, fresh oil, Listened to all the advice about the cam chain tensioner and guide issue... Heres my struggle: the bike starts quickly even when cold and idles with no problem, BUT when i give it gas there is no power at all.. I was able to get through gears smooth but there was no power at all.. when i stopped, there was oil in my airbox [overfilled with oil?] .. i hopped back on[after cleaning] and it was a tad bit more power but still very slugish... Any ideas?? ××I also removed the emssions system as well, put tape/ caps over all ports on carb××
brought a 550 gpz H2 back from a long hibernation (10+ years): Adjusted valves, cleaned carbs, new uni filter, stock airbox+ new boots , Assembly lube on top end, new battery, new plugs, new fuel and vaccum lines, fresh oil, Listened to all the advice about the cam chain tensioner and guide issue... Heres my struggle: the bike starts quickly even when cold and idles with no problem, BUT when i give it gas there is no power at all.. I was able to get through gears smooth but there was no power at all.. when i stopped, there was oil in my airbox [overfilled with oil?] .. i hopped back on[after cleaning] and it was a tad bit more power but still very slugish... Any ideas?? ××I also removed the emssions system as well, put tape/ caps over all ports on carb××
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- rrsmsw9999
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30 Oct 2016 04:35 #746511
by rrsmsw9999
1980 KZ 1000E2
Crashed 6/2016
1980 KZ550A
Sold 3/2016
Replied by rrsmsw9999 on topic 1983 Gpz 27k Starts but No Power!!
Oik in air box? MMmmmmmm.
1. is the clean air stuff hooked up? If so maybe wrongly and you are sucking oil from the valve cover to the box?
2. If oil is there, I am surprised it starts without fouling plugs. Could it be gas?
3. Check advancer to be sure it works correcty and is lubed.
4. Timing could be off.
6. Double check oil level, nut still unsure how oil would get there if the air system is off
Someone smarter than me will answer soon. Good luck.
R
1. is the clean air stuff hooked up? If so maybe wrongly and you are sucking oil from the valve cover to the box?
2. If oil is there, I am surprised it starts without fouling plugs. Could it be gas?
3. Check advancer to be sure it works correcty and is lubed.
4. Timing could be off.
6. Double check oil level, nut still unsure how oil would get there if the air system is off
Someone smarter than me will answer soon. Good luck.
R
1980 KZ 1000E2
Crashed 6/2016
1980 KZ550A
Sold 3/2016
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- TexasKZ
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30 Oct 2016 06:37 #746527
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic 1983 Gpz 27k Starts but No Power!!
Typically, oil gets into the airbox through the crankcase vent, not the clean air system. It is almost impossible for oil to get into the CAS. Even if it did, it would go out the exhaust system, not into the airbox.
If the bike sat unridden for some years before you got it, some of the piston rings may be stuck, thus allowing excessive blowby and a heavy oil mist forced into the airbox.
A seriously over filled crankcase, either too much oil or fuel from leaky carbs, can have the same effect.
Check the oil level. Remove the filler cap and take a sniff. If you smell strong gasoline fumes in the crankcase, then there are petcock and carb problems to address.
If it was a matter of too much oil, drain the excess and be happy.
If it is stuck rings, some gentle riding should free them up.
If the bike sat unridden for some years before you got it, some of the piston rings may be stuck, thus allowing excessive blowby and a heavy oil mist forced into the airbox.
A seriously over filled crankcase, either too much oil or fuel from leaky carbs, can have the same effect.
Check the oil level. Remove the filler cap and take a sniff. If you smell strong gasoline fumes in the crankcase, then there are petcock and carb problems to address.
If it was a matter of too much oil, drain the excess and be happy.
If it is stuck rings, some gentle riding should free them up.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- KZB2 650
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30 Oct 2016 07:00 #746528
by KZB2 650
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
Replied by KZB2 650 on topic 1983 Gpz 27k Starts but No Power!!
Maybe check the new air filter to see if the oil in the air box has fouled it up too..... synced the carbs ? Could you have capped off a vent on the carbs that you were not suppose too ? ....... hopefully someone that knows these carbs will comment.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
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- loudhvx
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30 Oct 2016 08:32 #746543
by loudhvx
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic 1983 Gpz 27k Starts but No Power!!
Compression test would show if you have a broken ring. That can cause excessive pressure in the crankcase which can pump oil into the airbox through the crankcase vent (small pipe from transmission to bottom of airbox).
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- kosh3rhalal
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30 Oct 2016 09:52 #746554
by kosh3rhalal
Replied by kosh3rhalal on topic 1983 Gpz 27k Starts but No Power!!
thanks man, ok ill test each cylinder for compression and see what the verdict is.. another mistake i made was i didnt cap of port 1 and 4 on the carb but i had the hoses from the emissions system connecting them both to a T and a main line heading out towards the back of the bike.. my mistake, would that create some insane vaccum ? i took it off and capped and i had no more oil issues lol, couldnt tell if it was from the hoses or I lost enough oil to solve the issue
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- loudhvx
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30 Oct 2016 11:49 #746566
by loudhvx
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic 1983 Gpz 27k Starts but No Power!!
Hard to say without knowing exactly how everything was connected. But if the crankcase vent (on the transmission going up to the bottom of the airbox) only connected to the airbox, and no other hoses went to the airbox, then the clean-air-system should not have had any effect on the crankcase pressure.
The airbox has a big hole near the top for the clean air system hose. When you remove that hose, you should plug that with a big cork. One of those large diameter vacuum caps from a parts store should plug it nicely.
If you incorrectly connect vacuum lines from the carbs to the valve-cover ports, that would either suck exhaust back into the intake, or suck air/fuel into the exhaust. It would probably run like crap and/or backfire a lot, but that should not really cause the oil pumping into the airbox. And if you T it and leave it open, you would suck fresh air into both the intake and exhaust... same result... run like crap and backfire.
The airbox has a big hole near the top for the clean air system hose. When you remove that hose, you should plug that with a big cork. One of those large diameter vacuum caps from a parts store should plug it nicely.
If you incorrectly connect vacuum lines from the carbs to the valve-cover ports, that would either suck exhaust back into the intake, or suck air/fuel into the exhaust. It would probably run like crap and/or backfire a lot, but that should not really cause the oil pumping into the airbox. And if you T it and leave it open, you would suck fresh air into both the intake and exhaust... same result... run like crap and backfire.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- kosh3rhalal
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30 Oct 2016 14:06 #746591
by kosh3rhalal
Replied by kosh3rhalal on topic 1983 Gpz 27k Starts but No Power!!
alright.. so i did my best to plug vaccum ports 1 2 and 4 on the carb.. 3 is the vaccum to the petcock.. I just put electrical tape to block the hole in the airbox.. i rode it lightly till the motor was warm and i could see that gas was leaking from the petcock at fuel line connection, i also got more oil in my airbox as well again. it starts up no problem, but does not idle strong
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- SWest
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30 Oct 2016 14:44 #746598
by SWest
Replied by SWest on topic 1983 Gpz 27k Starts but No Power!!
Have you had the carbs off? Those are CV carbs. I would do the thumb test on the ports top back of the carbs to see if the slides drop fast or slowly. If fast the diaphragms are hard, torn or otherwise faulty. You don't have the stock exhaust on it so it may be too lean. Pics of plugs?
Steve
Steve
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- kosh3rhalal
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30 Oct 2016 15:26 #746608
by kosh3rhalal
Replied by kosh3rhalal on topic 1983 Gpz 27k Starts but No Power!!
hey steve,,
ill test the carbs again, they were off the bike and the drops were consistant but i didnt test with the ports covered!! the intake and airbox boots were all hardened so if those were messed up im sure it might be a problem!! i put new plugs in a few days ago and will upload a pic in a sec.. thanks for the input
ill test the carbs again, they were off the bike and the drops were consistant but i didnt test with the ports covered!! the intake and airbox boots were all hardened so if those were messed up im sure it might be a problem!! i put new plugs in a few days ago and will upload a pic in a sec.. thanks for the input
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- TexasKZ
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30 Oct 2016 15:27 #746609
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic 1983 Gpz 27k Starts but No Power!!
Personally, I would sort out the petcock first.
1- For safety's sake. I am pretty sure you do not want a giant fireball between your legs as you hum down the hiway.
2-If the petcock is not shutting off properly, it could be filling the crankcase with raw fuel when the bike is parked. This could explain the oily liquid in the airbox and the poor performance. It can also lead to more expensive problems.
3-If the vacuum diaphragm in the petcock is leaking, fuel can be sucked into the carburetor that the vacuum hose is connected to, causing poor performance.
1- For safety's sake. I am pretty sure you do not want a giant fireball between your legs as you hum down the hiway.
2-If the petcock is not shutting off properly, it could be filling the crankcase with raw fuel when the bike is parked. This could explain the oily liquid in the airbox and the poor performance. It can also lead to more expensive problems.
3-If the vacuum diaphragm in the petcock is leaking, fuel can be sucked into the carburetor that the vacuum hose is connected to, causing poor performance.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- TexasKZ
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30 Oct 2016 15:31 #746610
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic 1983 Gpz 27k Starts but No Power!!
If the carb holders and intake boots are hard, they are most likely leaking. They will need to be replaced before the carbs can be properly dialed in .
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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