May 7, 2020 at 12:07 am #28906Simon AlexanderParticipant
I wanted to ask if it happens to others.
When I start my bike after the night when engine is cold, it sounds very smooth, the engine is not too loud, but when I stop after a ride for a break and try to start it again, it feels that engine works very loud at the beginning for a few seconds and when I continue to ride engine seems much louder than it was the first ride. Has this happened to anyone? Is it normal?May 11, 2020 at 4:54 pm #29009Max KoolParticipant
I bet you mean the cam chain rattling till the tensioner is up to pressure?May 11, 2020 at 6:32 pm #29011Freccia-neraParticipant
I’ve noticed some slight metallic rattling sometimes when I’m riding at a low rpm over small bumps or uneven terrain. I don’t know if it comes from the chain or the gearbox or elsewhere. It’s hard to reproduce, it just happens sometimes. Has anyone experienced a similar issue ?May 22, 2020 at 8:16 pm #29186Simon AlexanderParticipant
Yes I think it’s chain rattling till the tensioner is up. Is this mechanical issue or normal bike behavior?August 11, 2020 at 12:55 pm #31211Johan23Participant
I have the same problem and was planning on fitting a manual timing chain tension adjuster. After removing and inspecting the hydraulic one I decided to test a slightly thicker oil instead.
15w60 did the trick and it is now silent. I think this is due to tolerances in the making of the adjusters. Some have a slightly higher internal leaking that does not match with the thin oils that are standard.
Check the Youtube clip for more info.August 24, 2020 at 7:24 pm #31474Max KoolParticipant
Don’t install a manual cam chain tensioner.
1. with a stroke this long the delta-length from the crankshaft to the cylinder head between a cold and a hot engine means the chain will be either too tight on a hot engine, or too loose on a cold one.
2. the chain tensioner also dampens the little speed differences of the camshaft at low rpms, due to the valves pushing the camshaft a little forward at closing.
15W60 is the solution according to Pirate Racing, and I believe him, he knows his stuff.August 29, 2020 at 11:44 am #31565Kev212Participant
Install the Ktm dirt tricks camchain tensioner and all your problems will be goneDecember 12, 2020 at 1:14 am #33187CycledinoParticipant
Which Ktm dirt tricks cam chain tensioner model and have you done this on yours?December 12, 2020 at 8:00 am #33188Johan23Participant
<p style=”text-align: left;”>Don’t install a dirt tricks tensioner on a 701. It will remove the sound. But it will also put too much stress on the timing chain and bearings. Will be an very expensive service later in.</p>
Change to a bit thicker oil and you are good.December 12, 2020 at 8:09 am #33189hannesdParticipant
are we talking about the 701 or 401 engine?
i’ll be changing the oil soon on my 401 and was planning on just putting 10w40 semi synth oil in?December 12, 2020 at 12:55 pm #33191CycledinoParticipant
I was asking about my 701. I will try the heavier oil. Thanks for the info, you saved me $100!December 13, 2020 at 8:46 am #33199
@hannesd why not use the recommended 15W50? I’d only switch to a 10W oil if I lived in an extremely cold climate. And then only in the winter. And a 40 grade oil will most likely be too thin when the engine gets hot. A 10W50 would be a good cold climate oil for the 401.December 13, 2020 at 4:26 pm #33206hannesdParticipant
because the 10w40 is more common and therefor cheaper then the 15w50.
if this would do no harm, then i don’t see the benefit of the more expensive oil.
i have always used 10w40 in all my previous (street-) bikes.
only my husqvarna FC 250 dirtbike gets the 15w50 oils since this engine is on constant load and higher revs on the track.
December 13, 2020 at 5:58 pm #33209
- This reply was modified 2 months, 3 weeks ago by hannesd.
Okay. Speaking personally, engine oil isn’t something I want to cheapen out on. But if you decide to try it, let us know if there are any damaging effects on your engine.December 13, 2020 at 6:04 pm #33210
My local Husqvarna dealer CPS Motorcycles of Hinckley mentioned to me that oil quality and grade were important on the 401 singles, and they certainly didn’t recommend cheap oil. They also said that main engine bearing pick up was not unheard of on these engines, which was especially important as Husqvarna don’t offer main bearing shells as spare parts for these particular engines. These were the exact words of the dealer.
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