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Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 06 Feb 2019 11:19 #798286

  • Cailly
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Hi, just completed a cafe racer with full engine rebuild and fully customized 1983 GPz750 and having issues with the ignition. Bike runs fine and starts perfect, I can ride it up to 50km without a problem and quite fast, but it then start running on 3 cylinders until it just dies. It then can be restared but still running on 3 and dies properly a few minutes later. Trouble is is starts running perfectly again if I try to restart it 5-10 minutes later... please help if you know what this can be ?

Bike has : motogadget m unit fuse box, full Dyna 2000 ignition system (plate ignitor coils and leads) brand new starter relay new headlight new indicators new acewell speedo/tachi, fully new and custom wiring harness (soldered and heat shrunk), new regulator from ricks’s motorsport, the engine has been fully reconned with a Wiseco 810cc piston kit, new primary secondary chains, new valves and springs, etc etc

The tacho is still well wired but started acting up recently (reading comes from ignitor) - I have contacted dyna and they said its most likely a wiring issue which i dont believe as it runs so well and then sorts itself out withour touching anything ! Like a gremlin living inside my bike

Bike has 150km since the build was complete and broke down maybe 3 times in that period. The good part is I don’t get stranded but obviously this is far from ideal

Let me know your thoughts !

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Last edit: by Cailly. Reason: Typo

Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 06 Feb 2019 11:57 #798288

  • zed1015
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Does sound like an electrical component , coil etc breaking down under load BUT first make sure it isn't something daft like a blocked fuel tank vent as this will produce the same symptoms.
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Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 06 Feb 2019 13:27 #798290

  • Move0ver
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I agree with zed... did you line your fuel tank? That's an easy way to block off your tank vent if you're not paying attention. I speak from personal experience
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Last edit: by Move0ver.

Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 09 Feb 2019 13:26 #798401

  • stone fruit
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Could the battery be discharging? See if it's 14+v with engine running.
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Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 12 Feb 2019 03:11 #798526

  • gordone
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Is it always the same piston who dies?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 04 May 2019 10:40 #803322

  • Cailly
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Thanks for the help gents - after rewiring the stock ignition that I kept, same problem happened ... turns out it is air lock in the tank ! As it died on me I opened the cap and a lot of fuel could be seen rushing through the filter ... #fml !!! ordered a stock tank cap from partszilla and its now sorted and its a sweet ride ! Hope this helps others down the line !!

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Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 08 Jun 2019 11:26 #805360

  • Cailly
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Final Dyno figure for a free flowing exhaust, pod filters, Wiseco 810cc kit .... drumroll ... 77.89 Rear Wheel Horses, about 90 bhp I recon.

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Gpz750 Racer (Wiseco 810) Dyna 2000 ignition issues 09 Jun 2019 09:30 #805406

  • CoreyClough
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If you add a good set of either Web Cams, or Megacycle Cams, both degreed properly, you should see a good increase in HP and Tq. I got +11 hp and +4 tq.at the rear wheel by doing this to my GPz550 with 615 Kit by adding Megacycle Cams.
'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp
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Last edit: by CoreyClough.
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