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richierich

4Rt Cam Chain Tensioner..here's A Little Gem Worthy Of Remembering

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Hi all privileged 4RT owners!  :0)

 

I have an 06 4RT (Repsol) which I bought about 14 months ago to see if I took to 4 strokes; I did and love it.

 

I compete most weekends and the bike is rarely ridden between trials due to work etc and the poor machine is maintained to within an inch of it's life. I enjoy working on bikes as much as I enjoy riding them and the Montesa is an absolute pleasure to fettle with.

 

My last trial was 2 weeks ago and towards the end of the last lap I noticed a noise, which had manifested the previous weekend, which was becoming "noticeable". After cleaning the bike off at home and restarting to try and trace the "noise" with a big screwdriver hearing aid, I found it to be coming from the cam chain side low down. Assuming it to be a worn cam chain and guides I prepared to order the parts and look forward to a big strip down.

 

However, having chased my parts order on Friday which had not arrived nearly 2 weeks later, I found that due to a "system blip" the order had not yet been processed so I asked them to hold fire on the order as I had a free weekend to do some further investigations then get back to them on Monday with a full list of parts required.

 

Having made up the little cam chain tensioner extraction and setting tool, I started to loosen off the tensioner housing (2 bolts) and noticed the whole housing did not seem to be under any pressure. Both bolts were about half way out by now and I pushed the tensioner back in to the cylinder housing with ease, so assumed the cam chain had stretched beyond the limit of the tensioner plunger. It was at this point that I tried out my newly made tool which slipped and suddenly the tensioner was under pressure. Removing the tensioner fully from the bike, I ran the plunger in a few times with a screwdriver and it was fine. There was no build up of contaminants in the assembly but I gave it a clean, refitted it using my beautifully crafted new tool and started her up (1st kick...naturally!).

 

Sorted. No more cam chain noise.

 

I have no idea how it happened but it did and thought I would share in case anyone else experiences similar.

 

One question; do I trust that tensioner or replace with same or a manual one from H&D?

 

 

 

 

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I had the tensioner on mine out recently for similar reasons. For the benefit of others, there is no need to make up a tool.

I found that if I wound the plunger in with a screwdriver then held it there by hand I could insert a hexagonal screwdriver bit and lock it on the flutes of the access tube then release it once the tensioner was bolted bsck in place.

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I think if it was me I would order up new one.  I would go with a manual one but even a stock would make me feel better after knowing it wasn't working as expected.  

 

I have an 07 and though I wouldn't feel bad about riding it like that with the parts on order I would want to be sure I trusted it long term for events etc.  Would rather be safe than sorry.  

 

 

My 2 cents for what its worth.  

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Thanks for that really interesting information, particularly as there had been a previous post where most advice suggested the tensioner could not be a problem.

Just goes to show there is always something new to learn on the forum.

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