VFR Engine valve bounce help.

franna16 · Post by **franna16** » Sat Oct 20, 2012 2:30 pm

Hey Guys.

A few Years back my VFR nc30 started Giving me S%*T.

I've had the engine replaced once before but I have the same problem again. I'f I remember Correctly its valve bounce (this happened a few years back).

I remember from reading a few years back this is common on VFR's and it could not be Fixed.

I'ts a few years later and i know a lot more about engines and I would guess someone has a been able to fix this Problem by now. Can Someone link me to the correct Threads and sites for parts to fix this. I don't really want to buy a new (old) engine. I'd rather fix this one and know its done right. I might even Strip the whole thing and get a few Tyga and HRC goodies (if there are any).

Any advise would be appreciated

Post by **thunderace** » Sat Oct 20, 2012 3:06 pm

franna16 wrote:Tyga and HRC goodies (if there are any).

Did Jimmy Saville have keys to Broadmoor?

Loads of Tyga and HRC stuff for the 30 about. A little tip though, try and buy it all from guys on here rather than chancing your arm on eBay

franna16 · Post by **franna16** » Sat Oct 20, 2012 3:11 pm

As you can probably tell i'm still a noob when it comes to VFR engines. Last time I rode my VFR was when i was 18. So about 5 years back ($$$$$$$$$$)

Is valve bounce the correct Explanation for my problem? That clicking noise it makes and the bike not revving.

Oh and yes I would trust People on a Forum allot more than Ebay.

Only Crappy thing is importing to South Africa (import Tax

)

franna16 · Post by **franna16** » Sat Oct 20, 2012 4:41 pm

Anyone?

Post by **Drunkn Munky** » Sat Oct 20, 2012 4:49 pm

Ive had NC's for quite some time now and know a fair bit about them but ive never heard of valve bounce, and i cant understand why its something thats not repairable. I could well be wrong tho, learn something new everyday

What exactly is the problems you are having? i have a feeling someone was pulling your leg last time in order to get you to buy another engine.

franna16 · Post by **franna16** » Sat Oct 20, 2012 5:01 pm

Drunkn Munky wrote:Ive had NC's for quite some time now and know a fair bit about them but ive never heard of valve bounce, and i cant understand why its something thats not repairable. I could well be wrong tho, learn something new everyday

What exactly is the problems you are having? i have a feeling someone was pulling your leg last time in order to get you to buy another engine.

HEHE after a few hours of google searches im about 90% sure I’m using the wrong term. Back then my dad knew what the problem was and I knew nothing But he's not here any more so I can't really ask him. SO it's kinda difficult to explain the problem. maybe I should attach a new Battery to the bike and start it and record the sound for you.

I feel like a Dumb ass now.

From what I remember. The bike won't rev past about 2500 RPM and its making a clapping noise.

Post by **porndoguk** » Sat Oct 20, 2012 5:31 pm

Sounds like the valve clearances need adjusting, also known as tappets if adjustable with a locknut (but not in an nc30 engine) so maybe thats the word? Sounds like you may have been ill informed previously that they are not adjustable hence you buying another engine, however you can fit the correct sized shims to changed the clearances

Post by **Neosophist** » Sun Oct 21, 2012 2:31 am

Your the second person in as many days with knackered engines from south africa.. it's like a death place for the vfr.

If the engine is making that kind of noise and wont rev, don't run it yet, that sounds really bad, it might not be terminal yet but could be, so maybe it is already dead, maybe not.

Lets start with some history, what you did, what you didn't do, how did it start.

Since you had this happen to two engines your very unlucky or it is something your doing / not doing.

Providng they have appropriate oil changes (with the correct oil) and the valve clearnes checked / adjusted they should last a really really long time.

Since you mentioned valve bounce (which it won't be) I have a suspicion you may have dropped a valve and its the piston hitting the valve.

So before you run it anymore, give me the histroy.

How long you had it, how many miles, did it just start or get gradually worse? How do you maintain the bike.

Then we can go from there.

franna16 · Post by **franna16** » Sun Oct 21, 2012 7:59 am

Double Post

franna16 · Post by **franna16** » Sun Oct 21, 2012 8:02 am

Neosophist wrote: Providing they have appropriate oil changes (with the correct oil) and the valve clearnes checked / adjusted they should last a really really long time.

Since you mentioned valve bounce (which it won't be) I have a suspicion you may have dropped a valve and its the piston hitting the valve.

So before you run it any more, give me the history.

How long you had it, how many miles, did it just start or get gradually worse? How do you maintain the bike.

Then we can go from there.

Ok let me try and remember.

I got the bike when I turned 17. We Bought it second-hand (obviously). The previous owner (asshole) had put on a Yoshi pipe (in my opinion its a bit big but it sounds nice) and swapped the back spring for an old 600 blade spring (to soft for some reason) . oh yes and its been de-restricted

about a week after I got the bike the Power Control Unit (don't know if that's the correct name) burnt out and we replaced it with a new better unit and moved it so that there is better airflow over the cooling fins.

After a month I noticed that at about 150kph the bike won't rev more and was loosing power. Soon after we took it in to a little shop who works on a lot of VFR's (Raceway International, very dodgy Japanese owner in my opinion). The guy said we had to replace the engine so we did (R8000 Rand later about).

Then a year went by without any hassles and the only mod I did to the bike was to drill a few extra holes in the air filter cover. That's when the noise started and very soon after that the bike was limping home not revving at all. and its been standing ever since. About 5 years. My Dad passed away so that’s when my racing and bike building days also stopped. Now that I’m done with my studies and working I can Finally spend some money on the bike again.

I remember them talking about you can't make new ...........(some component) for the bike because it warps because its too thin or something. But I had no idea what they were talking about. (Shims, or cams or something). But yes they might have been bullshitting.

Hope that helps.
I've got a volvo s40 t4 and I’ve been working allot on that engine so I’m learning allot. I'm not scared of fiddling any-more hehe.

VFR Engine valve bounce help.

VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.

Re: VFR Engine valve bounce help.