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Hey, New to the forums so thanks in advance for any input. I've got a '77 GS 750. I bought the bike for 200 bucks and have only rebuilt the carbs and replaced various cables and electrical components. Roughly 350 US dollars invested with price of bike.
I was riding one day and cylinder number one (the one by your left foot while riding) started to backfire. The motor overheated and the lower engine oil seal ( the one at the very bottom of the bike below the oil level viewer.) I pulled off the road, let it cool, and then took off down the road. The cylinder continued to backfire above 4000rpms.
Basically, I don't want to replace the seal if the rest of the motor is screwed. Here's what I've gathered:
1. All plugs black.
2. No vacuum leak apparent. (sprayed ether around boot while reving motor)
3. Will not rev above 6000 rpm when cold, but does not backfire until then.
4. Only backfires out of number one cylinder, regardless of engine temp.
5. Will only rev to 4000rpm when warm, backfires out of number one cylinder at 4000rpm
6. Points gapped appropriately.
7. New gas, have run Seafoam through motor (mixed with 3 gallons of fuel)
8. Charging system checks out.
9. Carbs have not been synced and bike has not been timed.
I understand that syncing the carbs and timing the bike are necessary, but being that the problem is isolated to the number one cylinder, I tend to believe it is a problem with that particular cylinder, not with something that effects all the cylinders.
Erik
I was riding one day and cylinder number one (the one by your left foot while riding) started to backfire. The motor overheated and the lower engine oil seal ( the one at the very bottom of the bike below the oil level viewer.) I pulled off the road, let it cool, and then took off down the road. The cylinder continued to backfire above 4000rpms.
Basically, I don't want to replace the seal if the rest of the motor is screwed. Here's what I've gathered:
1. All plugs black.
2. No vacuum leak apparent. (sprayed ether around boot while reving motor)
3. Will not rev above 6000 rpm when cold, but does not backfire until then.
4. Only backfires out of number one cylinder, regardless of engine temp.
5. Will only rev to 4000rpm when warm, backfires out of number one cylinder at 4000rpm
6. Points gapped appropriately.
7. New gas, have run Seafoam through motor (mixed with 3 gallons of fuel)
8. Charging system checks out.
9. Carbs have not been synced and bike has not been timed.
I understand that syncing the carbs and timing the bike are necessary, but being that the problem is isolated to the number one cylinder, I tend to believe it is a problem with that particular cylinder, not with something that effects all the cylinders.
Erik
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