Retiring from Drag Racing
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Re: Retiring from Drag Racing
17 Jul 2026 20:28 - 17 Jul 2026 20:33
Today I went to my Son's house and took the battery out of a truck he is selling to spin this engine over to check the compression. I have had it sitting with some WD40 on the rings for a couple of days.
I need to check the cam timing to be sure where it is as the cam cover was loose and its been so long I am not sure what I was doing when I last assembled it. There are some notes but I have not had time to read them yet.
This is how I check the cams on this bike :
A custom degree wheel that rides on a socket. The decal is a little wrinkled up from sitting in a hot barn but it should be OK to get it "close".
The piston domes are so big the plugs sit up on some thick spacers.
Also found some alcohol and nitro stored with the bike. I had about 4 gallons of alcohol with about 20% Nitro mixed, and 1/2 a gallon of 100% Nitro sealed up well in containers. I also found about 700 ml of fuel lube. I was thinking I may be able to offer this up to some RC hobby guys because I think they run 20-30% mixed fuels.
I need to check the cam timing to be sure where it is as the cam cover was loose and its been so long I am not sure what I was doing when I last assembled it. There are some notes but I have not had time to read them yet.
This is how I check the cams on this bike :
A custom degree wheel that rides on a socket. The decal is a little wrinkled up from sitting in a hot barn but it should be OK to get it "close".
The piston domes are so big the plugs sit up on some thick spacers.
Also found some alcohol and nitro stored with the bike. I had about 4 gallons of alcohol with about 20% Nitro mixed, and 1/2 a gallon of 100% Nitro sealed up well in containers. I also found about 700 ml of fuel lube. I was thinking I may be able to offer this up to some RC hobby guys because I think they run 20-30% mixed fuels.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
Last edit: 17 Jul 2026 20:33 by Injected. Reason: more info
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Re: Retiring from Drag Racing
18 Jul 2026 14:17
Found out I had more 100% Nitro than what I thought I had, about 1-1/2 gallons. I also was able to test the 3 x 1 gallon containers and they are at 3.5%, 9.5% and 11.5%.
Already have one RC Monster truck guy interested so have to mix up to 20% minimum. Not sure on the pricing yet but that stuff has really gone up in price!
Already have one RC Monster truck guy interested so have to mix up to 20% minimum. Not sure on the pricing yet but that stuff has really gone up in price!
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
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Re: Retiring from Drag Racing
29 Jul 2026 12:36 - 29 Jul 2026 12:38
I finally got the cams timed (was off one tooth) to where there was no collision but did not use a degree wheel. Cold compression was lower than I expected at 240 PSI, which is a bit too high for the street and a stock starting system. Going to have to lower the compression when I take the engine apart.
One SUV battery at 12 volts was just strong enough to turn it over.
All the race parts are now stripped off of it.
Now I can see what I have to work with.
I have to shelve this one for now and take the touring bike apart. It is slated for a complete strip down.
Once I take this bike apart I can then store the red drag bike on the stand at the back of the garage then work on it over the Winter. I then need to start working on my 1197 project again as its been sitting for a while.
One SUV battery at 12 volts was just strong enough to turn it over.
All the race parts are now stripped off of it.
Now I can see what I have to work with.
I have to shelve this one for now and take the touring bike apart. It is slated for a complete strip down.
Once I take this bike apart I can then store the red drag bike on the stand at the back of the garage then work on it over the Winter. I then need to start working on my 1197 project again as its been sitting for a while.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
Last edit: 29 Jul 2026 12:38 by Injected. Reason: sp
The following user(s) said Thank You: asphalt900
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Re: Retiring from Drag Racing
30 Jul 2026 05:42
Darn Injected, do you have room enough to stick one more log in the fire? You're Busy!!
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Re: Retiring from Drag Racing
31 Jul 2026 17:07
Yeah, that's the reason I am downsizing on the motorcycle front, too many unfinished projects so something's gotta give. Time to let go of some of it.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
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Re: Retiring from Drag Racing
01 Aug 2026 16:28 - 01 Aug 2026 16:31
I started disassembling this bike which has been on the road for 10 summers, its slowly getting stripped. This is actually the second day of working on it, but I did not get very far yesterday.
This is a good shot of what the difference is in a 750 chain drive case VS a non chain drive case. You can see the where the 650/750 trans cover does not go over the chain drive gasket surface. You can also see the extra oil port to lube the bevel gear just above the clutch rod that I had to plug with a 1/16NPT fitting.
Got it this far today :
Forgot how much it takes to remove the fairing, you need to unbolt it from the mounting bracket before you can remove it from the frame. The only other way to lift it off as one piece would be to remove the forks and triple trees!
I was musing today and thought this may get rebuilt with the 1327cc Z1 engine I have along with the 43mm throttle bodies (from the alcohol drag bike) Converted those to use my Microsquirt EFI parts. Put a big oil cooler on it with some thermostatically controlled fans behind it... Just a thought
The big engine does make more sense on the highway.
I might actually have to make a couple of project threads moving forward.
This is a good shot of what the difference is in a 750 chain drive case VS a non chain drive case. You can see the where the 650/750 trans cover does not go over the chain drive gasket surface. You can also see the extra oil port to lube the bevel gear just above the clutch rod that I had to plug with a 1/16NPT fitting.
Got it this far today :
Forgot how much it takes to remove the fairing, you need to unbolt it from the mounting bracket before you can remove it from the frame. The only other way to lift it off as one piece would be to remove the forks and triple trees!
I was musing today and thought this may get rebuilt with the 1327cc Z1 engine I have along with the 43mm throttle bodies (from the alcohol drag bike) Converted those to use my Microsquirt EFI parts. Put a big oil cooler on it with some thermostatically controlled fans behind it... Just a thought
The big engine does make more sense on the highway.
I might actually have to make a couple of project threads moving forward.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
Last edit: 01 Aug 2026 16:31 by Injected. Reason: sp
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