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2021 V7 850 Valve adjustment TDC issue

W

WillyPete

Just got it firing!
Joined
Oct 17, 2023
Messages
3
Location
Pensacola, FL
Hey y'all,

I haven't found anyone with the same issue but I'm having trouble moving my pistons to TDC. I've taken out the spark plugs and put it in high gear. I rotate the wheel as I've seen others do but my pistons don't seem to budge at all

I'd greatly appreciate any insight anybody has

Thanks,

Will
 
So are you saying the wheel turns but the engine doesn't, you are rotating the rear wheel?, sorry couldn't resist. Are you in a false neutral. On my Breva there is a bolt at the front of the engine which makes it easy to turn the engine over, I'm not sure on the makeup of the V7 engine. FYI even in a high gear it requires a bit of muscle to turn the engine and make sure you turn the wheel in the correct direction.
 
Just saw your other post. It appears you don't have a center stand to lift the rear wheel. How are you getting the wheel off the ground?
 
Hey all, thanks for the replies.

Long story short, I was able to get the pistons moving and the valves adjusted.

To answer some of the comments, I had the bike jacked up, I had the bike in gear.

When I would try rotating the wheel it would travel about 3-4 inches and then stop, making a clunking sound but no movement in the pistons.

I decided to keep cycling between 5th and 6th gear a few times while rotating the tire, as V700Steve and John had mentioned, and it started to turn how it should. Definitely a user error and not the bike.

Thanks everyone for the help

-Will
 
Related with this topic , it is recommended to turn back wheel till any object inserted from plug hole reaches its highest position, you have to catch the point just before it starts descending, not a sensitive way of doing the job for unexperienced newbies( well,l know dealers are for it). Searched and found no info, is there a tool that properly fits plug hole and objectively shows the TDC for my 2022 V7 850 ?
 
Use a straw to get TDC, it has to be on the compression stroke. If you go too far you can always go back and then repeat the operation. You'll soon get the feel of it. I made a tool to get TDC from an old spark plug after removing the ceramic insulator, the bike in question had a plug right over the top of the piston. I think the V7 is in the side so it wouldn't work in this case.
 
I have a timing rod that was in the toolkit of a Jawa 350 twin I bought years ago. It works well on vertical plug heads but less so on those with an angle. On my Guzzi I use one of those small green dowel rods that support young plants as they grow. Less likely to bend than a straw, strong enough not to break if one is hamfisted. I prefer having a timing bung like the big blocks where you can line up the timing marks for each cylinder but rotating the rear wheel with the bike in gear works well enough. You do need to be sure that you are working on the right stroke (firing), not the exhaust stroke. If the bike runs fine before starting you’ll know if you have the right stroke because both valves will have clearance. The job is a bit fiddly but it just needs patience.
 
Sorry -correction - adjust at tdc at the end of compression stroke/ beginning of firing stroke, not at tdc at the end of exhaust/beginning of induction.
 
Yes, that’s how the workshop manual says to do it and is what I do on my V7 850. TBH I have always found valve clearance adjustment straight forward. It’s probably a matter of confidence more than anything, though have my been on forums for many years some apparently still try to set clearances on the wrong stroke….
 
There is a very simple way to confirm you are on the compression stroke.

As Steve says above, you can watch the intake valve open as the piston drops and close as the piston rises to TDC.

HOWEVER, you can confirm this is the situation by wiggling each valve rocker arm. At TDC, both valves will be fully closed and there will be a gap between the rocker arm and the valve stem. You should be able to move the rocker arm a tiny bit on both the intake and the exhaust valves.

If you find one side to loose with wiggle and the other tight as can be, you are not on TDC Compression stroke.
 
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