84 VF750S POPPIN AND BACKFIRING..audio/vidio included!!!!

somone tell me what she sounds like? started my vf750s for the first time and im getting alot of backfiring at deceleration and whats the clattering sound at the end of the vid after all the revving stops? heres the vid: YouTube - VF750S First Startup!!!

 

did you do a carb sync?

 

Look for the clattering on the wonky cam lobes and/or excessive valve clearances. Also, bad camchain tensioners cause rattles, ands VFs are infamous in that department. Backfires can be a result of incorrect cam timing........sometime a result of bad tensioners.

Sorry, but VF series bikes almost ruined Honda's reputation forever with their multiple mechanical issues.

Unless it's been carefully maintained, you'd need to be a masochist to own one. :behindsofa:

 

that was helpful....pull the valve covers and look at your cam lobs is what squirrelman's comment translates to..if you have wear your screwed blued and tatooed..

 

did u guys listen to the sound in the video???? what did you think? with the cylinder covers off can i see the cams that easy and how can i really tell if they are worn dont i have to measure em? checking timing, carb sync, and valve clearance are all on my to do list!!!!! ill get back to yall!!!

Heres the Vid Link again. the clattering can be heard toward the end of the vid. YouTube - VF750S First Startup!!!

 

I just listened to the audio and think it's a cam chain or tensioner problem.

Dem bitches done woe out !!

 

I think it's valve clearances for the rattle, and a dirty carb for the pop. Did you turn the throttle while starting and then it poped?

 

I don't think you're fucked though.

 

Great!!!:crutch: thats what my bike reminds me of!!! Im gonna get right on it Squirrelman and tell u what i find,,,,,will b a few days cause im waiting on some special tools to come in by mail!!!! i order alot of stuff from the States so i always havta wait weeks on stuff to do simple stuff!!!! BUT I WILL GET BACK TO YA AND IS IT MAJOR AND HARD TO FIX WHAT YOUR TALKIN ABOUT? Hope Not but im not gonna :yield: no matter what!!! :hump:

 

Dang i really hope your right cause thats easy stuff ya only pops when i blip the throttle. also havent done a oil change since i bought the bike yet and it was cold as hell outside, the clattering got alittle quiter as she warmed up but not much. the carbs i cleaned and reinstalled. just not synched, need the right tool for that :rambo: so im gonna order me some special tools on ebay and :drinker: till they get here!!! Thanks for the reply dude will let u know what it is...

 

Years of experience says that noise is NOT valve clearances, but of course i could be mistaken cuz the audio isn't great.

 

We will know when my tappet feeler gauge gets in probly in about a week or so Squirrel i will make a better vid maybe in the daylight next time and ill try to capture that sound cause i agree, u cant hear the clacking that good but its pretty damn obvious when your standing near the bike...

 

Here ya go Brother 2 vids of just the Engine running. IS SHE SOUNDIN ALRIGHT FOR A SABRE OR DO YOU HEAR SOMETHING BAD????? :flame:

YouTube - 84 VF750S Motor Sound1

YouTube - 84 VF750S Motor Sound2

 

Here ya go Brother 2 vids of her runnin i hope your right!!! :flame:

YouTube - 84 VF750S Motor Sound1

YouTube - 84 VF750S Motor Sound2

 

Here ya go Brother 2 vids of just the Engine running. IS SHE SOUNDIN ALRIGHT FOR A SABRE OR DO YOU HEAR SOMETHING BAD????? :flame:

YouTube - 84 VF750S Motor Sound1

YouTube - 84 VF750S Motor Sound2

 

Cam chain tensioners for sure. You can hear the chain. Valves may be loose also, but the tensioners are not working right.

 

Is it easy to fix?

 

Depends on your mechanical abilities. Not for the faint of heart, but not bad for a good mechanic. Time consuming and a little technical. Search the web. I think there are write ups on how to do it.

You can get your parts here: Honda Yamaha Suzuki Kawasaki Sea-Doo Can-Am Ski-Doo Motorcycle Parts ATV parts Scooter Parts personal watercraft parts Accessories
They ship fast and pricing is good. That's why I deal with them. Bought my tensioners there 2yrs ago.

 

I agree with you Grey, definitely sounds like a cam chain tensioner problem to me. Maybe some valve clearances off in the mix, but the main issue is the cam chain tensioner. I think the only way to replace that is to remove the heads, which will involve a rather costly head gasket to put back together. A used cam chain tensioner on eBay can be had for next to nothing. Used can last you a lifetime or go bad in just a few miles, so it's all up to you.

Something to consider, this is one of my bikes with the cams off 1 notch. Obsiously my noise was a lot louder, but when I zoom in on the engine do our ticks/clicks sound similar?

YouTube - 1999 ZX9R Engine Noise/Rattle CCT?

Good luck! And don't rev it too much in it's present condition.