Harley Davidson Forums - Engine Mechanical Topics

New lifters and pushrods

riggs — Mon, 18 May 2026 16:44:07 GMT

I have 32,000 miles on my 2019 TriGlide with no real issues. I have heard that some schools of thought indicate changing the lifters and pushrods after 30,000 miles. Have done some research and have seen that a few long time mechanics believe this to be a good move to eliminate problems down the road. Just am curious as to what the thoughts are on doing this on a motor that has no problems at the present time.

Twin Cam 88 Wont Idle

captng1 — Sun, 17 May 2026 15:13:57 GMT

Hi All,
My 2002 FLSTC with a Twin Cam 88 won't idle and backfires when decelerating. I opened up the carb bowl and it was clean and the low speed jet looked OK. Any ideas? I assume maybe a vacuum leak on the intake but from where? The seal around the carb was very tight. I recently removed the front exhaust pipe to check the cam chain tensioners and put it back together with the same exhaust doughnut. It does not appear to be leaking exhaust and if it is it may cause a backfire, but I don't think it would have anything to do with not idling properly. Your thoughts?
Thanks

Low-middle speed miss

Fatboyalvis — Fri, 15 May 2026 18:22:53 GMT

I have a 2010 FatBoy that has a miss after you get up to speed and then back off to cruise. Anybody else have this problem?

2000 Road King 103 TC swap

AdamWhyel — Fri, 15 May 2026 15:27:34 GMT

First post in the forums here, and i just had a question. I have the opportunity to purchase a 2000 Road king without the engine and transmission pretty cheap. Also a 2014 103 and 6 speed transmission and wiring harness off of a triglide. My question is if i have the engine transmission and wiring harness off of the 2014 bike what all would be needed to swap it into the 2000 frame. Thanks in advance

SE120R case assembly

Puchtdi — Fri, 15 May 2026 12:11:50 GMT

Hi there, since Harley can't deliver the SE Pro TC-A 99-06 crankcase assy anymore does anyone know a company or person who hase a crankcase assembly for sale?
I don't mind if it is a used one, i can reassembly them myself.
partnumber 24400031 is the case i am looking for.
Please tell me if you know someone, thanks in advance.

Kind regards,

Alexander

cam and primary chain tensioner check frequency

clackavosticus — Fri, 15 May 2026 11:25:42 GMT

I would like to confirm at what Kilometers the cam chain and primary chain tensioners on an M8 should be checked. When I asked copilot at work and then at home I got 2 differing quotes for the cam chain tensioners 40K at home and 90K at work. Similarly for the primary at home 90K at work 40K. I' d like someone to chime in with the definitive answer please as AI is useless in this regard.

Lifter replacement video/tutorial?

DENALIAKITAS — Tue, 12 May 2026 01:18:40 GMT

Have a 2015 RK CVO 110 and need to replace lifters. Are there any good videos and or tutorials on doing the job? Thanks

Rebuilding crank shaft

Leimy — Sat, 09 May 2026 17:17:09 GMT

Howdy,
I can't find a thread so I'll post it here. I have a 2017/107 that I have done work on to about a stage II. See signature. I have 55K miles now. I plan on keeping the bike and I'm looking ahead for options. Currently making
107HP / 120 Tq and has not been on a dyno tune yet.
I haven't' decide for sure If i will go with big bore kit to 124 or just rebuild stock 107. I do plan on doing a Darkhorse Comp and headwork. The heads will depend on what I do for the Ci.

My question is about the crank. I haven't done a crank run-out yet. Actually don't have a gauge.
The question is rebuilding the stock crank ( not weld, just rebuild and balance) or getting a after market like S&S.
The S&S is not welded like a Darkhorse, so could be rebuilt it needed down the road.
When I rebuild, I know that is the time to address the crank, bearings, pushrods.

Has anyone had their crankshaft rebuilt? What are your thoughts?

(compied from another post so this is a NEW post)

TC 88 Oil Pump

zfigoli — Mon, 04 May 2026 18:28:38 GMT

Hi, doing cam chain tensioners, lifters and inner cam bearings on a TC 88. I did not remove the oil pump from the cam plate and didn�t plan on it, but I�m wondering if it will be worth the risk of the alignment or not. Should I or is it ok to leave it?

also, for the alignment if you have to spin the rear wheel while tightening and the cam chain and sprockets are off - how do you get them in alignment and not 180 off? Worried about timing.

bike has 26,000 miles.

Piston Help

mikewb2 — Mon, 27 Apr 2026 11:35:38 GMT

Picked up a 1998 Road Glide, with 43k miles. Lost a base gasket 5 miles into my first ride! I�ve never owned or worked on one of these motors before but teardown seems to be going pretty well. Have a new set of lifters and an inner cam bearing ready to go. Was planning on new rings for the existing pistons, but I�m seeing some material around the wrist pin clip that I wasn�t expecting. Does this look normal? The cylinder looks great (I think).