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Old 02-10-2012, 09:36 AM   #1 (permalink)
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72 Honda ct70 trailbike help

Working on 1972 honda trail ct70 bike for a guy...I can get no spark,feels like no compression, valves are opening as should. Well I guess what I need is a manual for it..I checked this site couldnt find one. I dont know how to get to the coil or nothing..new territory for me. Thanks
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Old 02-10-2012, 09:43 AM   #2 (permalink)
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the spark plug coil is under the seat...inside the frame if i remember right ?..i found a micro fich for a ct70k1..it's not a repair manual..it just list the parts..amazingly..you still can get parts for it ?..although..i did not call to ask about them ?..lol.
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Old 02-10-2012, 09:44 AM   #3 (permalink)
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and the reason you could not find any manual's on here for it ?..is because it's considered a motor cycle...lol.
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Old 02-10-2012, 10:19 AM   #4 (permalink)
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that motor uses points may need to file end gap and set to like 10 to 16 thousants low compression check valve adjustment may be tight set them to .003 thousants
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Old 02-10-2012, 10:31 AM   #5 (permalink)
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Ignition Timing Adjustment
CT70 And Mini Trail 50


1. Remove the left crankcase cover.
2. Rotate the flywheel counterclockwise to find the point where the breaker point gap is at maximum and check if the gap is correct using a thickness gauge.
3. The standard gap. is 0.012-0.016 in. (0.3-0.4 mm).
4. When adjustment is necessary, loosen the breaker locking screw and move the breaker base in either clockwise or counterclockwise direction to obtain the standard point gap setting.
5. After completting the breaker point gap adjustment, recheck the ignition timing. To perform the check, rotate the flywheel so that when the flywheel "F" timing mark is aligned to the timing index mark on the left crank case, the breaker points just begin to open.
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Old 02-10-2012, 10:47 AM   #6 (permalink)
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Old 02-10-2012, 11:07 AM   #7 (permalink)
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no I got spark BUT pretty sure what the problem is! I cleaned the carb pulled the neck off that connect carb and head..inside the head a bunch of foam! Yeah I know! HOW! ? I think someone pulled carb off put foam in to keep dirt out and forgot to pull the foam back out! Now I gotta yank the head n cylnder get it out...
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Old 02-10-2012, 11:23 AM   #8 (permalink)
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At least you can pull head and cyl on bike. Easy to work on from what I remember back in the mid 70's.
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Old 02-10-2012, 02:08 PM   #9 (permalink)
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yeah pretty easy pull the head off cylnder n pistion fine, but somone had put this good size piece foam and its all tangled in the exhaust/intake valves! the dang valve compressor i have is too big... wonder if i can buy a chinese replacement head and slap it on? this head seen better days for sure!
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Old 02-10-2012, 02:18 PM   #10 (permalink)
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dont buy a chinese head, they wont last. buy the OEM from ebay. there are MANY parts on there. even if your getting spark. i suggest filing the points and cleaning them up. more than likely they need to be cleaned, i wouldnt be surprised if it gave you a stronger spark.
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