Chain Tensioner Looking For Advice Regarding a Chain Tensioner for a 4-Stroke Jackshaft Kit

[Member 28661]

Hello everyone, thank you for the advice and information I've received with my previous problem on this forum. Everyone was super helpful! Had a Huasheng 142F 49cc motor that didn't want to run and resolved the problem it was having! Shout out to @CrazyDan @hazmat @Nature girl @guitarfanatic21 , sorry if I didn't get everyone's name but thank you!

Have only one thing preventing me from riding unfortunately :/ ! The chain coming from the jack shaft to the freewheel has a bit of slack. Not enough to take a link or half-link out. The slack is due to a large portion of the chain that's unsupported. I've posted this before but didn't get help in another thread so I''ll paste it here:

I think I'm satisfied with the idle and the tune at this moment. Keep starting up the bike every 2 days or so to keep fresh fuel in the fuel bowl. As well as have the motor run for a few minutes.

The current problem I'm running into is the loose chain going from the jackshaft to the freewheel (pictured below). It's the only thing left preventing me from riding the bike. The chain is quite loose, enough to cause teeth skipping and noise. Also it may even throw the chain , definitely not good! So i'm not riding it until it's fixed.

This is when the chain is tight. (picture below)

Currently I'm looking to create or find a chain tensioner that would be able to keep this chain tight. I've been speaking with Jim over at Sick Bike Parts and talking about using the Right Side chain tensioner for this project http://sickbikeparts.com/chain-tensioner-right-side/ . However I'm not sure if this would work for this bike and he agrees. As you can see in the pictures above and from the product photo for the chain tensioner from Sick Bike Parts. The chain tensioner is supposed to be placed below the output sprocket of the jack shaft. It's made for the 2 stroke shift kit, while mine is the 4 stroke shift kit. So there isn't much metal to drill a hole for the bolt or the chain tensioner. Does anyone know of any good DIY or prebuilt motorcycle chain tensioners for example that would work well for this situation?

 

[Member 28661]

One of the only chain tensioner I've seen done on the internet for these 4-stroke shift kits. However the chain tensioner in the video is on the right side of the chain while for my build it needs to be located on the left side. Looking on this forum and couldn't find any, but I'll keep an eye out.

 

[greenjon]

I use the bolt under the jackshaft to tension the chain, as per the directions.

 

[Member 28661]

I use the bolt under the jackshaft to tension the chain, as per the directions.

Unfortunately I'm unable to do that due to the engine dimensions being quite large for the frame of the bike. The engine is already touching the top of the bike frame and the intake of the motor is touching the motor mount. Thus I can't adjust the chain tensioner built into the motor mount of the sick bike parts shift kit. This is why a chain tensioner is required in my case. I have already order a chain tensioner built by sick bike parts and it should be arriving this week, so this should hopefully solve my problem. I will keep this thread active when I'm attaching this chain tensioner on my motorized bike. As I haven't seen anything videos or post pertaining to putting a chain tensioner on the sick bike parts 4-stroke shift kit online. Would be quite helpful to someone in my situation down the line.

 

[Guest-555971]

Ya should drop the engine down on the adjuster and shorten the chain a half link or more and then move motor up