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Makotosun

max speed 1969 CT1

  • RLC158
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max speed 1969 CT1 was created by RLC158

The bike starts up 2nd prod ticks over great, no smoke.I did a top end rebuild so still running in .Changes gear , but will not do more than 35mph  at 4/5000 revs in 5th , ive blipped it up  too 7000 but no diff to top speed ,. i weigh 200ilbs,Any ideas please.
           Regards GB
The following user(s) Liked this Post: Papawhellie
27 Apr 2023 12:34 #1

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Replied by RT325 on topic max speed 1969 CT1

Not easy to guess at that one. Does it rev & pull hard through the lower gears to 7 grand then fall over in top gear or just flat all the way [thinking restricted exhaust in the built in non removable parts deep in the tail end [spark arrestor part] or that item might be part of the removable end parts but should be obvious with a light in the end looking deep in. All a guess but gotta start somewhere. Could also be points gap closed down to almost invisible which effectively retards the timing & turns horses in donkeys. That's my first guesses.
Last edit: 27 Apr 2023 14:34 by RT325.
27 Apr 2023 14:34 #2

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Replied by MarkT on topic max speed 1969 CT1

I don't understand. It does 35 at 4000 or 5000 rpm and 7000 rpm in 5th gear?

Could clutch be slipping?

Speedo is bad and won't read over 35?
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
The following user(s) Liked this Post: RT325, Swoop56, Ht1kid
27 Apr 2023 14:37 #3

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Replied by RT325 on topic max speed 1969 CT1

Carby little Oring leaking which can richen mixture greatly. Wouldn't rev though if it had a bad leak. [seals main jet into the needle jet].
27 Apr 2023 14:49 #4

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Replied by asco on topic max speed 1969 CT1

I weigh about 200. Most 15hp CT1 - **** should pull about 55 mph no problem.

clutch - is there 1/8” free play in the clutch lever?
carburetor - is the jetting standard and are you at 5000 feet elevation?
tires - add two pounds regardless to eliminate that.
gearing - is the gearing standard or modified?

Yes, my AT1-C had a cruising speed of 35 mph. Not flat out, just enough to scoot ….

a
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1971 CT1-C (BRANDY)
1970 DT1-C (MONICA)
1972 AT2M (ZIFFLE)
1970 CT1-B (HULK)
1971 DT1E (GINA)
1970 CT1-B (CLIDE)
27 Apr 2023 16:14 #5

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Replied by Tom P on topic max speed 1969 CT1

I weigh about 185 and my '71 CT-1 will do 65 MPH on the speedo, which I discovered is really around 62, with a GPS app. I went up one tooth on the front sprocket, but I think it might even wind out faster with the stock gear. It's cruises great at 45-50 around town.
Last edit: 27 Apr 2023 17:35 by Tom P.
27 Apr 2023 17:34 #6

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Replied by RLC158 on topic max speed 1969 CT1

For future ref checked the front sproket only 12 teeth.changed to standard 14th. speed normal .holds 50mph easily  with a little to spare can get  60mph .
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24 May 2024 07:40 #7

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