Real ChatGPT answer + Gemini simulation · index seedCmv5AbvdrT4completeAI OverviewAutomotive · motorcyclescommercial
Are there any widespread engine vibration issues with modern Harley Davidson Sportster models that I should check out before buying used?
ChatGPTgpt-6Geminigemini-3.5-flash-lite3 passes + 1 real-search37 queries10/30/2026
Download run
Gemini unique queries
34
2 in ≥ half the passes · stability 35%
ChatGPT real searches predicted
100%
3 of 3 matched the simulation
Fan-out diagram
Seed → topic clusters → sub-queries, per model.
SEED QUERY
Are there any widespread engine vibration issues with modern Harley Davidson Sportster models that I should check out before buying used?
34 unique queries · 3 passes
Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.
Query classes
Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
Gemini simulated (34)ChatGPT real searches (3)
Classes come from the query-classifier (a local Laya model). 19 of 37 calls are low-confidence (under 50%) — hover a query in the table to see its confidence.
What the models actually searched
Each model answered the query with its own web search. These are the searches it ran, matched to the closest simulated query.
ChatGPT3 real searches · gpt-6100% predicted
Harley-Davidson Sportster Evolution rubber mounted engine vibration common problems engine mounts 2004 2022 Google ↗
Harley Sportster S Nightster Revolution Max vibration complaints counterbalancer issues reliability Google ↗
Harley Davidson Sportster used buyer inspection vibration engine mounts primary compensator common issues Google ↗
- Harley-Davidson Sportster 883 and 1200 (2004-2020) · bennetts.co.uk
- Harley Davidson Sportster: Why is My Bike Vibrating? · hdforums.com
- EVO: Engine Mechanicals - Sub-09A · sportsterpedia.org
- M1573: Revolution Max Troubleshooting Tips · static.nhtsa.gov
Semantic map
Every query placed by meaning (EmbeddingGemma 2, 256-d). Shaded regions are topics, nearby points are near-paraphrases, and a circle's size is how often the query came back.
Colour
SimulatedReal search
Hover a query to see its counterpart · click a topic to focus it · zoom with Ctrl/⌘ + scroll, a pinch, double-click or +
Queries
34 queries · click a column to sort
| Query / type | Search | Intent | Query class | Routing format | Cluster | Freq ↓ | Weight |
|---|---|---|---|---|---|---|---|
harley davidson sportster engine vibration problems REFORMULATION | Google ↗ AI Mode ↗ | Find direct reports of vibration issues on modern Sportster models. | Reason | forum/qna | engine vibration and smoothness | 2x of 3 | |
common problems with modern harley sportster models REFORMULATION | Google ↗ AI Mode ↗ | Learn about all common mechanical and electrical issues associated with recent Sportster generations. | Reason | web_article | used buyer inspection checklist | 2x of 3 | |
harley davidson sportster vibration problems common issues REFORMULATION | Google ↗ AI Mode ↗ | Find common reports of engine vibration on Harley-Davidson Sportster motorcycles. | Reason | web_article | engine vibration and smoothness | 1x of 3 | |
evolution engine vs revolution max vibration sportster COMPARATIVE | Google ↗ AI Mode ↗ | Understand how vibration differs between older Evolution-powered Sportsters and newer Revolution Max models like the Sportster S. | Comparison | comparison_table | engine vibration and smoothness | 1x of 3 | |
used harley sportster buyer checklist mechanical inspection IMPLICIT | Google ↗ AI Mode ↗ | Get a structured inspection list for evaluating a used Sportster before purchase. | Reason | checklist | used buyer inspection checklist | 1x of 3 | |
rubber mounted vs rigid mount sportster engine vibration COMPARATIVE | Google ↗ AI Mode ↗ | Understand the difference in vibration levels between rubber-mounted and rigid-mounted Sportster engines. | Comparison | comparison_table | engine vibration and smoothness | 1x of 3 | |
used harley sportster pre purchase inspection checklist IMPLICIT | Google ↗ AI Mode ↗ | Get a step-by-step checklist of what to inspect when buying a used Sportster, including mechanical wear. | Reason | checklist | used buyer inspection checklist | 1x of 3 | |
rubber mounted vs rigid engine sportster vibration comparison COMPARATIVE | Google ↗ AI Mode ↗ | Understand how engine mounting styles affect vibration levels across different Sportster model years. | Comparison | comparison_table | engine vibration and smoothness | 1x of 3 | |
used harley sportster buyer checklist RELATED | Google ↗ AI Mode ↗ | Get a comprehensive checklist for inspecting a used Harley Sportster before purchase. | Comparison | checklist | used buyer inspection checklist | 1x of 3 | |
harley sportster rubber mounted engine vibration fix RELATED | Google ↗ AI Mode ↗ | Discover if excessive vibration on rubber-mounted Sportsters indicates worn motor mounts. | Reason | how_to_steps | engine vibration and smoothness | 1x of 3 | |
harley davidson sportster s engine vibration feedback ENTITY EXPANSION | Google ↗ AI Mode ↗ | Check specific vibration characteristics of the modern Sportster S with the Revolution Max engine. | Reason | review_roundup | engine vibration and smoothness | 1x of 3 | |
most reliable year harley davidson sportster to buy used ENTITY EXPANSION | Google ↗ AI Mode ↗ | Identify specific model years of the Sportster family known for better reliability and fewer mechanical issues. | Comparison | buyers_guide | used buyer inspection checklist | 1x of 3 | |
are sportster vibrations normal or a sign of engine damage RELATED | Google ↗ AI Mode ↗ | Differentiate between normal Harley V-twin character vibration and abnormal mechanical faults. | Reason | faq_page | engine vibration and smoothness | 1x of 3 | |
harley davidson evolution engine reliability ENTITY EXPANSION | Google ↗ AI Mode ↗ | Evaluate the long-term reliability and durability of the Harley Davidson Evolution engine used in Sportsters. | Yes / no | web_article | used buyer inspection checklist | 1x of 3 | |
i commute 50 miles daily is sportster vibration too much PERSONALIZED | Google ↗ AI Mode ↗ | Determine if modern Sportster vibration causes rider fatigue during long commutes. | Consequence | review_roundup | engine vibration and smoothness | 1x of 3 | |
best year used harley davidson sportster to buy PERSONALIZED | Google ↗ AI Mode ↗ | Identify the most reliable model years for purchasing a used Sportster. | Comparison | buyers_guide | used buyer inspection checklist | 1x of 3 | |
how to check for excessive vibration on a motorcycle test ride RELATED | Google ↗ AI Mode ↗ | Learn how to diagnose abnormal engine vibrations during a test ride of a used motorcycle. | Instruction | how_to_steps | engine vibration and smoothness | 1x of 3 | |
harley sportster excessive vibration forum discussions RELATED | Google ↗ AI Mode ↗ | Read real-world rider experiences and complaints regarding Sportster vibrations. | Reason | forum/qna | engine vibration and smoothness | 1x of 3 | |
best year harley sportster to buy used PERSONALIZED | Google ↗ AI Mode ↗ | Determine which model years of the used Harley Sportster offer the best value and fewest mechanical issues. | Comparison | buyers_guide | used buyer inspection checklist | 1x of 3 | |
harley davidson sportster s engine specs and counterbalancer ENTITY EXPANSION | Google ↗ AI Mode ↗ | Check the engineering design of the Sportster S engine regarding vibration reduction features like counterbalancers. | Reason | product_spec_sheet | engine vibration and smoothness | 1x of 3 | |
how to reduce engine vibration on harley sportster IMPLICIT | Google ↗ AI Mode ↗ | Find aftermarket fixes or adjustments to minimize vibration on a Sportster. | Instruction | how_to_steps | engine vibration and smoothness | 1x of 3 | |
harley sportster engine shakes excessively at idle REFORMULATION | Google ↗ AI Mode ↗ | Find solutions or normal operating parameters for a Sportster engine shaking heavily while idling. | Consequence | faq_page | engine vibration and smoothness | 1x of 3 | |
are sportster handlebars numb from vibration at highway speed RELATED | Google ↗ AI Mode ↗ | Find out if high-frequency handlebar vibration is normal at highway cruising speeds on modern Sportsters. | Consequence | faq_page | engine vibration and smoothness | 1x of 3 | |
harley davidson revolution max engine vibration issues ENTITY EXPANSION | Google ↗ AI Mode ↗ | Research technical problems related to the newer liquid-cooled engines in modern Sportsters. | Reason | product_spec_sheet | engine vibration and smoothness | 1x of 3 | |
sportster 883 vs sportster 1200 vibration differences COMPARATIVE | Google ↗ AI Mode ↗ | Compare vibration characteristics between the 883cc and 1200cc Sportster engine variants. | Comparison | product_spec_sheet | engine vibration and smoothness | 1x of 3 | |
harley davidson technical service bulletins sportster vibration IMPLICIT | Google ↗ AI Mode ↗ | Access official factory service notices or recalls regarding excessive engine vibration. | Reason | pdf_whitepaper | engine vibration and smoothness | 1x of 3 | |
harley davidson sportster reliability ratings over the years REFORMULATION | Google ↗ AI Mode ↗ | Assess the general long-term reliability and common failure points of Sportsters. | Reason | web_article | used buyer inspection checklist | 1x of 3 | |
harley davidson service bulletin engine vibration ENTITY EXPANSION | Google ↗ AI Mode ↗ | Check official Harley Davidson technical service bulletins related to excessive engine vibration. | Reason | pdf_whitepaper | engine vibration and smoothness | 1x of 3 | |
how to check motor mounts on harley sportster RELATED | Google ↗ AI Mode ↗ | Learn the visual and physical inspection methods for identifying degraded rubber engine mounts. | Instruction | tutorial_video/transcript | used buyer inspection checklist | 1x of 3 | |
common problems to look for when buying a used harley sportster IMPLICIT | Google ↗ AI Mode ↗ | Discover all major mechanical and cosmetic issues prone to used Sportsters. | Consequence | buyers_guide | used buyer inspection checklist | 1x of 3 | |
are harley sportsters reliable for daily commuting IMPLICIT | Google ↗ AI Mode ↗ | Understand if modern Sportsters can handle daily commuting without rider fatigue from vibration. | Comparison | podcast_transcript | used buyer inspection checklist | 1x of 3 | |
used harley sportster depreciation and ownership costs PERSONALIZED | Google ↗ AI Mode ↗ | Understand the financial aspects and maintenance overhead of buying a used Sportster. | Reason | pricing_page | used buyer inspection checklist | 1x of 3 | |
harley sportster engine mount replacement cost and signs of wear RELATED | Google ↗ AI Mode ↗ | Learn how to spot worn engine mounts that cause excessive vibration. | Reason | how_to_steps | used buyer inspection checklist | 1x of 3 | |
harley davidson engine mount replacement cost and signs RELATED | Google ↗ AI Mode ↗ | Find out the signs of worn engine mounts and the cost to replace them on a Sportster. | Reason | pricing_page | used buyer inspection checklist | 1x of 3 |
Passes
Does another pass still surface new queries? A flattening curve means the fan-out has stabilised.
Geminix = pass, y = cumulative unique queries
| Model | Pass | Target | Generated | Seconds | Tokens (in / out) | Notes |
|---|---|---|---|---|---|---|
| gemini-3.5-flash-lite | 1 | 12 | 12 | — | 919 / 1,514 | |
| gemini-3.5-flash-lite | 2 | 12 | 12 | — | 919 / 1,398 | |
| gemini-3.5-flash-lite | 3 | 12 | 12 | — | 919 / 1,461 |