Popping and backfiring

[Bohnzye]

Hey guys, my 78 750k is yet to leave the launch pad and find myself in more trouble.. My bike is in dormancy while I address other issues but I start it up daily... It has a 4into 1 exhaust.. and have watched the start ups take longer and longer over a course of weeks. When I do get it started the exhaust pipe continuously pop and an occasional backfire chimes in afterwards... Is this timing related bad points condensor? This bike was dropped in my lap after I had a 30 year hiatus of wrenching on any bikes....Thanks alot fellas...

 

[dirtdigger]

After sitting that long points could be corroded and the carbs will need to be gone through. If something sits that long I would go through and do complete tune and adjustments of all the maintanece items and do a compression test. A lot of people lately seem to be getting old 750s that have been sitting for years. I would do a search on here about this.....we have talked about it quite a few times. With how many people are getting these old bikes back out of storage I think I should open a 750 honda shop and do tune ups and rebuilds LOL

 

[Bohnzye]

Dangggg. Jbird is the paint pro, You have the wrenching talent and troubleshooting and neither of you live within crying distance of me...wahhhhhh. A lot of the Harley Dealers locally are capitalizing as you just stated and will now work on just about any japanese bike... I guess I have some learning to do if I wanna get this on the road and keep it running.Thanks so much Digger....

 

[cafeken]

After sitting that long points could be corroded and the carbs will need to be gone through. If something sits that long I would go through and do complete tune and adjustments of all the maintanece items and do a compression test. A lot of people lately seem to be getting old 750s that have been sitting for years. I would do a search on here about this.....we have talked about it quite a few times. With how many people are getting these old bikes back out of storage I think I should open a 750 honda shop and do tune ups and rebuilds LOL

thats funny i was think the same thing the other day lol

 

[cafeken]

Hey guys, my 78 750k is yet to leave the launch pad and find myself in more trouble.. My bike is in dormancy while I address other issues but I start it up daily... It has a 4into 1 exhaust.. and have watched the start ups take longer and longer over a course of weeks. When I do get it started the exhaust pipe continuously pop and an occasional backfire chimes in afterwards... Is this timing related bad points condensor? This bike was dropped in my lap after I had a 30 year hiatus of wrenching on any bikes....Thanks alot fellas...

ok so everything dirtdigger said is true but dose the bike have the stock airbox and exhaust?

 

[jbird7262]

I've been stock piling tune-up parts, you can find decent deals on e-bay, I got points/condensor kit for $28.00 free shipping, carb. kits from japan with 3 sets of jets (110,120,125) and a slow jet 40) under $30.00 and float bowl gaskets (no swell) $ 7.50. If that gas has been setting a while you might want to drain it , check the petcock filter and put some fresh fuel with a bit of fuel stabilizer in it, drain the float bowls and check if they are gunked up with varnish, new plugs, and clean or replace the points. Basics.